Publications

2015

• Correlative microscopy of radial junction nanowire solar cells using nanoindent position markers
  
  • Fejfar Antonín
  • Hývl Matěj
  • Vetushka Aliaksei
  • Pikna Peter
  • Hájková Zdeňka
  • Ledinský Martin
  • Kočka Jan
  • Klapetek Petr
  • Marek Aleš
  • Mašková Andrea
  • Vyskočil Jiří
  • Merkel Janis
  • Becker Christiane
  • Itoh Takashi
  • Misra Soumyadeep
  • Foldyna Martin
  • Yu Linwei
  • Roca I Cabarrocas Pere
  Solar Energy Materials and Solar Cells, Elsevier, 2015, 135. (10.1016/j.solmat.2014.10.027)
  DOI : 10.1016/j.solmat.2014.10.027
• A mid-infrared Mueller ellipsometer with pseudo-achromatic optical elements
  
  • Garcia-Caurel E
  • Lizana A
  • Ndong G
  • Al-Bugami B
  • Bernon C
  • Al-Qahtani E
  • Rengnez F
  • de Martino A
  Applied optics, Optical Society of America, 2015, 56 (10), pp.2776. The purpose of this article is to present a new broadband Mueller ellipsometer designed to work in the mid-infrared range, from 3 to 14 microns. The Mueller ellipsometer, which can be mounted in reflection or in transmission configuration, consists of a polarization state generator (PSG), a sample holder, and a polarization state analyzer (PSA). The PSG consists in one linear polarizer and a retarder sequentially rotated to generate a set of four optimal polarization states. The retarder consists in a bi-prism made of two identical Fresnel rhombs disposed symmetrically and joined by optical contact, giving the ensemble a " V " shape. Retardation is induced by the four total internal reflections that the beam undergoes when it propagates through the bi-prism. Total internal reflection allows to generate a quasi-achromatic retardation. The PSA is identical to the PSG, but with its optical elements mounted in reverse order. After a measurement run, the instrument yields a set of sixteen independent values, which is the minimum amount of data required to calculate the Mueller matrix of the sample. The design of the Mueller ellipsometer is based on the optimization of an objective criterion that allows minimizing the propagation of errors from raw data to the Mueller matrix of the sample. The pseudo-achromatic optical elements ensure a homogeneous quality of the measurements for all wavelengths. The performance of the Mueller ellipsometer in terms of precision, and accuracy, is discussed and illustrated with a few examples. (10.1364/AO.54.002776)
  DOI : 10.1364/AO.54.002776
• 4-Pyridyl-9,9'-spirobifluorenes as Host Materials for Green and Sky-Blue Phosphorescent OLEDs
  
  • Thiery Sebastien
  • Tondelier Denis
  • Declairieux Céline
  • Geffroy Bernard
  • Jeannin Olivier
  • Métivier Rémi
  • Rault-Berthelot Joëlle
  • Poriel Cyril
  Journal of Physical Chemistry C, American Chemical Society, 2015, 119 (11), pp.5790–5805. (10.1021/jp511385f)
  DOI : 10.1021/jp511385f
• Low temperature epitaxial growth of SiGe absorber for thin film heterojunction solar cells
  
  • Cariou R.
  • Tang J.
  • Ramay N.
  • Ruggeri R.
  • Roca I Cabarrocas P.
  Solar Energy Materials and Solar Cells, Elsevier, 2015, 134. (10.1016/j.solmat.2014.11.018)
  DOI : 10.1016/j.solmat.2014.11.018
• Inflation physics from the cosmic microwave background and large scale structure
  
  • Abazajian K. N.
  • Arnold K.
  • Austermann J.
  • Benson B. A.
  • Bischoff C.
  • Bock J.
  • Bond J. R.
  • Borrill J.
  • Buder I.
  • Burke D. L.
  • Calabrese E.
  • Carlstrom J. E.
  • Carvalho C. S.
  • Chang C. L.
  • Chiang H. C.
  • Church S.
  • Cooray A.
  • Crawford T. M.
  • Crill B. P.
  • Dawson K. S.
  • Das S.
  • Devlin M. J.
  • Dobbs M.
  • Dodelson S.
  • Doré O.
  • Dunkley J.
  • Feng J. L.
  • Fraisse A.
  • Gallicchio J.
  • Giddings S. B.
  • Green D.
  • Halverson N. W.
  • Hanany S.
  • Hanson D.
  • Hildebrandt S. R.
  • Hincks A.
  • Hlozek R.
  • Holder G.
  • Holzapfel W. L.
  • Honscheid K.
  • Horowitz G.
  • Hu W.
  • Hubmayr J.
  • Irwin K.
  • Jackson M.
  • Jones W. C.
  • Kallosh R.
  • Kamionkowski M.
  • Keating B.
  • Keisler R.
  • Kinney W.
  • Knox L.
  • Komatsu E.
  • Kovac J.
  • Kuo C.-L.
  • Kusaka A.
  • Lawrence C.
  • Lee A. T.
  • Leitch E.
  • Linde A.
  • Linder E.
  • Lubin P.
  • Maldacena J.
  • Martinec E.
  • Mcmahon J.
  • Miller A.
  • Mukhanov V.
  • Newburgh L.
  • Niemack M. D.
  • Nguyen H.
  • Nguyen H. T.
  • Page L.
  • Pryke C.
  • Reichardt C. L.
  • Ruhl J. E.
  • Sehgal N.
  • Seljak U.
  • Senatore L.
  • Sievers J.
  • Silverstein E.
  • Slosar A.
  • Smith K. M.
  • Spergel D.
  • Staggs S. T.
  • Stark A.
  • Stompor R.
  • Vieregg A. G.
  • Wang G.
  • Watson S.
  • Wollack E. J.
  • Wu W. L. K.
  • Yoon K. W.
  • Zahn O.
  • Zaldarriaga M.
  Astroparticle Physics, Elsevier, 2015, 63, pp.55 - 65. Fluctuations in the intensity and polarization of the cosmic microwave background (CMB) and the large-scale distribution of matter in the universe each contain clues about the nature of the earliest moments of time. The next generation of CMB and large-scale structure (LSS) experiments are poised to test the leading paradigm for these earliest moments-the theory of cosmic inflation-and to detect the imprints of the inflationary epoch, thereby dramatically increasing our understanding of fundamental physics and the early universe. A future CMB experiment with sufficient angular resolution and frequency coverage that surveys at least 1% of the sky to a depth of 1 uK-arcmin can deliver a constraint on the tensor-to-scalar ratio that will either result in a 5 σ measurement of the energy scale of inflation or rule out all large-field inflation models, even in the presence of foregrounds and the gravitational lensing B-mode signal. LSS experiments, particularly spectroscopic surveys such as the Dark Energy Spectroscopic Instrument, will complement the CMB effort by improving current constraints on running of the spectral index by up to a factor of four, improving constraints on curvature by a factor of ten, and providing non-Gaussianity constraints that are competitive with the current CMB bounds. (10.1016/j.astropartphys.2014.05.013)
  DOI : 10.1016/j.astropartphys.2014.05.013
• In situ photoluminescence system for studying surface passivation in silicon heterojunction solar cells
  
  • Abolmasov Sergey N.
  • Cabarrocas Pere Roca I
  Journal of Vacuum Science & Technology A, American Vacuum Society, 2015, 33 (2). (10.1116/1.4902014)
  DOI : 10.1116/1.4902014
• Fundamental insights into the threshold characteristics of organic field-effect transistors
  
  • Jung Sungyeop
  • Kim Chang-Hyun
  • Bonnassieux Yvan
  • Horowitz Gilles
  Journal of Physics D: Applied Physics, IOP Publishing, 2015, 48 (3), pp.035106. We physically model the threshold characteristics of organic field-effect transistors (OFETs) using a two-dimensional finite-element method. The transfer characteristics are simulated for staggered OFETs with various electronic structures. A reliable method to extract a structure-unique threshold voltage is presented based on the second-derivative method. By changing the hole injection barrier height in such a manner that the flat-band voltage, defined from the difference of Fermi levels of gate and source electrode, is kept constant, we demonstrate a direct impact of the hole injection barrier height on the threshold voltage. Simulated charge carrier distribution shows the two-dimensional nature of channel creation process and physical insights into the threshold characteristics of OFETs. (10.1088/0022-3727/48/3/035106)
  DOI : 10.1088/0022-3727/48/3/035106
• Decoupling the effects of self-assembled monolayers on gold, silver, and copper organic transistor contacts
  
  • Kim Chang-Hyun
  • Hlaing Htay
  • Hong Jong-Am
  • Kim Ji-Hoon
  • Park Yongsup
  • Payne Marcia M.
  • Anthony John E.
  • Bonnassieux Yvan
  • Horowitz Gilles
  • Kymissis Ioannis
  Advanced Materials Interfaces, Wiley, 2015, 2 (2), pp.1400384. In bottom-contact organic field-effect transistors (OFETs), the functionalization of source/drain electrodes leads to a tailored surface chemistry for film growth and controlled interface energetics for charge injection. This report describes a comprehensive investigation into separating and correlating the energetic and morphological effects of a self-assembled monolayers (SAMs) treatment on Au, Ag, and Cu electrodes. Fluorinated 5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TES-ADT) and pentafluorobenzenethiol (PFBT) are employed as a soluble small-molecule semiconductor and a SAM material, respectively. Upon SAM modification, the Cu electrode devices benefit from a particularly dramatic performance improvement, closely approaching the performance of OFETs with PFBT-Au and PFBT-Ag. Ultraviolet photoemission spectroscopy, polarized optical microscopy, grazing-incidence wide-angle X-ray scattering elucidate the metal work function change and templated crystal growth with high crystallinity resulting from SAMs. The transmission-line method separates the channel and contact properties from the measured OFET current–voltage data, which conclusively describes the impact of the SAMs on charge injection and transport behavior. (10.1002/admi.201400384)
  DOI : 10.1002/admi.201400384
• ortho-, meta-, and para-Dihydroindenofluorene Derivatives as Host Materials for Phosphorescent OLEDs.
  
  • Romain Maxime
  • Thiery Sébastien
  • Shirinskaya Anna
  • Declairieux Céline
  • Tondelier Denis
  • Geffroy Bernard
  • Jeannin Olivier
  • Rault-Berthelot Joëlle
  • Métivier Rémi
  • Poriel Cyril
  Angewandte Chemie International Edition, Wiley-VCH Verlag, 2015, 54 (4), pp.1176-80. This work reports the first structure-properties relationship study of ortho [2,1-c]-, meta [1,2-a]-, and para [1,2-b]dihydroindenofluorenes, highlighting the influence of bridge rigidification on the electronic properties. This study has made it possible to devise an extended π-conjugated molecule with both a high triplet state energy level and excellent thermal and morphological stability. As a proof of concept, dihydroindenofluorenes were used as the host in sky-blue phosphorescent organic light-emitting diodes (PhOLEDs) with high performance. (10.1002/anie.201409479)
  DOI : 10.1002/anie.201409479
• Low-voltage organic electronics based on a gate-tunable injection barrier in vertical graphene-organic semiconductor heterostructures
  
  • Hlaing Htay
  • Kim Chang-Hyun
  • Carta Fabio
  • Nam Chang-Yong
  • Barton Rob A.
  • Petrone Nicholas
  • Hone James
  • Kymissis Ioannis
  Nano Letters, American Chemical Society, 2015, 15 (1), pp.69–74. The vertical integration of graphene with inorganic semiconductors, oxide semiconductors, and newly emerging layered materials has recently been demonstrated as a promising route toward novel electronic and optoelectronic devices. Here, we report organic thin film transistors based on vertical heterojunctions of graphene and organic semiconductors. In these thin heterostructure devices, current modulation is accomplished by tuning of the injection barriers at the semiconductor/graphene interface with the application of a gate voltage. N-channel devices fabricated with a thin layer of C60 show a room temperature on/off ratio >104 and current density of up to 44 mAcm–2. Because of the ultrashort channel intrinsic to the vertical structure, the device is fully operational at a driving voltage of 200 mV. A complementary p-channel device is also investigated, and a logic inverter based on two complementary transistors is demonstrated. The vertical integration of graphene with organic semiconductors via simple, scalable, and low-temperature fabrication processes opens up new opportunities to realize flexible, transparent organic electronic, and optoelectronic devices. (10.1021/nl5029599)
  DOI : 10.1021/nl5029599
• Spiro-configured phenyl acridine thioxanthene dioxide as a host for efficient PhOLEDs.
  
  • Romain Maxime
  • Tondelier Denis
  • Geffroy Bernard
  • Shirinskaya Anna
  • Jeannin Olivier
  • Rault-Berthelot Joëlle
  • Poriel Cyril
  Chemical Communications, Royal Society of Chemistry, 2015, 51 (7), pp.1313-5. A new high triplet organic semi-conductor based on a donor-spiro-acceptor design has been synthesised and used as a host material in high performance (EQE = 11.4%) sky blue phosphorescent organic light emitting diodes. (10.1039/C4CC08028A)
  DOI : 10.1039/C4CC08028A
• Ultrathin nanostructured c-Si solar cells by low temperature and scalable processes
  
  • Gaucher A.
  • Cattoni A.
  • Massiot I.
  • Dupuis C.
  • Chen W.
  • Cariou R.
  • Foldyna M.
  • Roca I Cabarrocas P.
  • Lalouat Loïc
  • Drouard Emmanuel
  • Seassal Christian
  • Collin S.
  , 2015. We report on the fabrication and characterization of both flat and patterned c-Si solar cells on glass. We use epitaxial layers grown by plasma enhanced chemical vapor deposition at low temperature (T<200 degrees C), and anodic bonding on glass substrate. Inverted nanopyramids are fabricated by nanoimprint lithography and wet etching in alkaline solution. With 3 mu m-thick c-Si layers, the performances achieved with planar solar cells are Jsc = 18.3mA/cm(2) and eta = 6.1%. With an additional nanopyramid array on the front side of the cell, an improved short-circuit current of 25.3mA/cm(2) is obtained. We present the latest experimental results and discuss the path to be followed to achieve low cost, ultrathin c-Si solar cells with a 15% targeted efficiency.
• Sum decomposition of Mueller-matrix images and spectra of beetle cuticles
  
  • Arwin Hans
  • Magnusson Roger
  • Garcia-Caurel Enric
  • Fallet Clément
  • Jarrendahl, Kenneth
  • Foldyna Martin
  • de Martino Antonello
  • Ossikovski Razvigor
  Optics Express, Optical Society of America - OSA Publishing, 2015, 23, pp.1951 - 7950. Spectral Mueller matrices measured at multiple angles of incidence as well as Mueller matrix images are recorded on the exoskeletons (cuticles) of the scarab beetles Cetonia aurata and Chrysina argenteola. Cetonia aurata is green whereas Chrysina argenteola is gold-colored. When illuminated with natural (unpolarized) light, both species reflect left-handed and near-circularly polarized light originating from helicoidal structures in their cuticles. These structures are referred to as circular Bragg reflectors. For both species the Mueller matrices are found to be nondiagonal depolarizers. The matrices are Cloude decomposed to a sum of non-depolarizing matrices and it is found that the cuticle optical response, in a first approximation can be described as a sum of Mueller matrices from an ideal mirror and an ideal circular polarizer with relative weights determined by the eigenvalues of the covariance matrices of the measured Mueller matrices. The spectral and image decompositions are consistent with each other. A regression-based decomposition of the spectral and image Mueller matrices is also presented whereby the basic optical components are assumed to be a mirror and a circular polarizer as suggested by the Cloude decomposition. The advantage with a regression decomposition compared to a Cloude decomposition is its better stability as the matrices in the decomposition are determined a priori. The origin of the depolarizing features are discussed but from present data it is not possible to conclude whether the two major components, the mirror and the circular polarizer are laterally separated in domains in the cuticle or if the depolarization originates from the intrinsic properties of the helicoidal structure.-matrix characterization of bee-tle cuticle: polarized and unpolarized reflections from representative architectures," Appl. Opt. 49, 4558–4567 (2010).-induced polarization effects in the cuticle of scarab beetles: 100 years after Michelson," Phil. Mag. 92, 1583–1599 (2012). 4. H. Arwin, T. Berlind, B. Johs, and K. Järrendahl, "Cuticle structure of the scarab beetle Cetonia aurata analyzed by regression analysis of Mueller-matrix ellipsometric data," Opt. Express 21, 22645–22656 (2013). 5. matrices: how to decompose them?," Phys. Status Solidi A 205, 720–727 (2008). 6. S. R. Cloude, "Group theory and polarization algebra," Optik (Stuttgart) 75, 26–36 (1986). 7. S. R. Cloude and E. Pottier, "A review of target decomposition theorems in radar polarimetry," IEEE Trans. (10.1364/OE.23.001951)
  DOI : 10.1364/OE.23.001951
• A bridged low band gap A-D-A quaterthiophene as efficient donor for organic solar cells
  
  • Baert Francois
  • Cabanetos Clement
  • Leliege Antoine
  • Kirchner Eva
  • Segut Olivier
  • Aleveque Olivier
  • Allain Magali
  • Seo Gijun
  • Jung Sungyeop
  • Tondelier Denis
  • Geffroy Bernard
  • Roncali Jean
  • Leriche Philippe
  • Blanchard Philippe
  Journal of Materials Chemistry C, Royal Society of Chemistry, 2015, 3, pp.390-398. [small alpha],[small omega]-Bis(dicyanovinyl)quaterthiophene 1 with a median 4,4-diethyl-4H-cyclopenta[2,1-b:3,4-b[prime or minute]]dithiophene has been synthesized. UV-Vis absorption data show that the covalent bridging of the inner 2,2[prime or minute]-bithiophene leads to a significant reduction of the HOMO-LUMO gap essentially due to an increase of the HOMO level as confirmed by electrochemical and theoretical results. X-ray diffraction analysis of a single crystal of 1 shows that except for the out-of-plane ethyl groups, the conjugated system displays a quasi-planar geometry while the molecular packing exhibits strong [small pi]-stacking interactions and multiple short intermolecular contacts. Quaterthiophene 1 has been used as active donor material in organic solar cells of various architectures including bi-layer planar hetero-junctions and hybrid co-evaporated bulk hetero-junctions with C60 as electron acceptor material. A maximum conversion efficiency of 4.30% is obtained with a hybrid co-evaporated device. These results are discussed in terms of structure-properties relationships with reference to the open-chain parent [small alpha],[small omega]-bis(dicyanovinyl)quaterthiophene 2. (10.1039/c4tc02212b)
  DOI : 10.1039/c4tc02212b
• Functional oxide pressure sensor
  
  • Le Bourdais D.
  • Agnus G.
  • Maroutian T.
  • Pillard V.
  • Saint-Girons Guillaume
  • Vilquin Bertrand
  • Lefeuvre E.
  • Lecoeur P.
  , 2015. Manganites are well known in the oxide community, especially La2/3Sr1/3MnO3 (LSMO) for its magnetic behavior above room temperature. In these materials, electrical conduction is due to several phenomena such as double exchange or polaronic conduction that give rise to a modulation of the material’s resistivity with the temperature. Measuring the resistance of a device can thus be a way to measure its temperature and was notably used to design bolometers working at room temperature, thanks to its high Temperature Coefficient of Resistance (TCR) close to the ferromagnetic transition. For suspended microdevices, dependence on the background gaz pressure is also observed. This phenomenon relates to the Pirani effect where the surrounding gas cools down the heated device because the local thermal conductivity depends on ambient gas pressure. Close to the ferromagnetic transition, the TCR of LSMO is almost a decade higher than Platinum making this material a good candidate for sensor application at room temperature. Additionally, the high chemical stability of manganites and their very low intrinsic electrical noise level are other arguments to use them in this field. Micro-pirani sensors were fabricated thanks to the integration of LSMO on Si with STO and YSZ buffer following by MEMS technology processes. Such oxide-based sensors exhibit sensitivity 10 times better and power consumption reduced by a factor of 100 with respect to a metallic sensor with the same geometry.
• Spatial evolution of depolarization in homogeneous turbid media within the differential Mueller matrix formalism
  
  • Agarwal Naman
  • Yoon Jiho
  • Garcia-Caurel Enric
  • Novikova Tatiana
  • Vanel Jean-Charles
  • Pierangelo Angelo
  • Bykov Alexander
  • Popov Alexey
  • Meglinski Igor
  • Ossikovski Razvigor
  Optics Letters, Optical Society of America - OSA Publishing, 2015, 40 (23), pp.5634. (10.1364/OL.40.005634)
  DOI : 10.1364/OL.40.005634
• When nanophotonics meet thin crystalline-silicon photovoltaics
  
  • Depauw V.
  • Trompoukis C.
  • El Daif Ounsi
  • Lalouat Loïc
  • Ding He
  • Liu Jia
  • Harouri Abdelmounaim
  • Orobtchouk Regis
  • Mandorlo Fabien
  • Fave Alain
  • Seassal Christian
  • Drouard Emmanuel
  • Chen W.
  • Foldyna M.
  • Roca I Cabarrocas
  • Herman A.
  • Deparis O.
  • Dmitriev A.
  • Gordon I.
  • Poortmans J.
  , 2015. no abstract
• Properties modulation of organic semi-conductors based on a donor-spiro-acceptor (D-spiro-A) molecular design: new host materials for efficient sky-blue PhOLEDs
  
  • Romain Maxime
  • Tondelier Denis
  • Jeannin Olivier
  • Geffroy Bernard
  • Rault-Berthelot Joëlle
  • Poriel Cyril
  Journal of Materials Chemistry C, Royal Society of Chemistry, 2015, 3 (37), pp.9701-9714. Four high triplet org. semi-conductors based on the donor-spiro-acceptor design (D-spiro-A) have been synthesized. Their physicochem. and photophys. properties have been studied, compared and discussed in light of the nature of their resp. donor/acceptor units. The four compds. have been used as host materials in efficient sky-blue (EQE \textgreater 10% at 10 mA cm-2) phosphorescent org. light emitting diodes. (10.1039/C5TC01812A)
  DOI : 10.1039/C5TC01812A
• Perovskite Oxide MEMS: Strain Control and Sensor Applications
  
  • Lecoeur P.
  • Le Bourdais D.
  • Agnus G.
  • Maroutian T.
  • Matzen M.
  • Largeau L.
  • Saint-Girons Guillaume
  • Vilquin Bertrand
  • Lefeuvre E.
  , 2015. no abstract
• Enhancing the performances of P3HT:PCBM – MoS3 based H2-evolving photocathodes with interfacial layers
  
  • Bourgeteau Tiphaine
  • Tondelier Denis
  • Geffroy Bernard
  • Brisse Romain
  • Cornut Renaud
  • Artero Vincent
  • Jousselme Bruno
  ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2015, 7, pp.16395-16403. Organic semiconductors have great potential for producing hydrogen in a durable and economically viable manner, as they rely on readily available materials and can be solution-processed over large areas. With the objective of building efficient hybrid organic-inorganic photo-electrochemical cells, we combined a noble metal-free and solution-processable catalyst for proton reduction, MoS3, and a poly-(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction (BHJ). Different interfacial layers were investigated to improve the charge transfer between P3HT:PCBM and MoS3. Metallic Al\Ti interfacial layers led to an increase of the photocurrent up to 8 mA cm?2 at reversible hydrogen electrode (RHE) potential with a 0.6 V anodic shift of the HER onset potential, a value close to the open circuit potential of the P3HT:PCBM solar cell. A 50 nm thick C60 layer also works as interfacial layer, with current density reaching 1 mA cm?2 at RHE potential. Moreover, two recently highlighted figures-of-merit, measuring the ratio of power saved, Φsaved,ideal and Φsaved,NPAC, were evaluated and discussed to compare the performances of various photocathodes assessed in a three-electrode configuration. Φsaved,ideal and Φsaved,NPAC use the RHE and a non-photoactive electrode with identical catalyst as dark electrode, respectively. They provide different information especially for the differentiation of the role of the photogenerating layer and the role of the catalyst. Best results were obtained with the Al\Ti metallic interlayer, with Φsaved,ideal and Φsaved,NPAC reaching 0.64 % and 2.05 % respectively. (10.1021/acsami.5b03532)
  DOI : 10.1021/acsami.5b03532
• Photonic nanostructures for advanced light trapping in thin crystalline silicon solar cells
  
  • Trompoukis Christos
  • Abdo Islam
  • Cariou Romain
  • Cosme Ismael
  • Chen Wanghua
  • Deparis Olivier
  • Dmitriev Alexandre
  • Drouard Emmanuel
  • Foldyna Martin
  • Caurel Enric Garcia-
  • Gordon Ivan
  • Heidari Babak
  • Herman Aline
  • Lalouat Loic
  • Lee Ki-Dong
  • Liu Jia
  • Lodewijks Kristof
  • Mandorlo Fabien
  • Massiot Inès
  • Mayer Alexandre
  • Mijkovic Vladimir
  • Muller Jerome
  • Orobtchouk Regis
  • Poulain Gilles
  • Prod'Homme Patricia
  • Cabarrocas Pere Roca I
  • Seassal Christian
  • Poortmans Jef
  • Mertens Robert
  • Daif Ounsi El
  • Depauw Valérie
  Physica Status Solidi A (applications and materials science), Wiley, 2015 (212), pp.140–155. (10.1002/pssa.201431180)
  DOI : 10.1002/pssa.201431180
• New Approaches to Improve the Performance of Thin-Film Radial Junction Solar Cells Built Over Silicon Nanowire Arrays
  
  • Misra Soumyadeep
  • Yu Linwei
  • Foldyna Martin
  • Roca I Cabarrocas Pere
  IEEE Journal of Photovoltaics, IEEE, 2015, 5 (1). (10.1109/JPHOTOV.2014.2366688)
  DOI : 10.1109/JPHOTOV.2014.2366688
• Synthesis, Electronic Properties and WOLED Devices of Planar Phosphorus-Containing Polycyclic Aromatic Hydrocarbons
  
  • Riobé François
  • Szűcs Rózsa
  • Bouit Pierre-Antoine
  • Tondelier Denis
  • Geffroy Bernard
  • Aparicio Fátima
  • Buendía Julia
  • Sánchez Luis
  • Réau Régis
  • Nyulászi László
  • Hissler Muriel
  Chemistry - A European Journal, Wiley-VCH Verlag, 2015, 21 (17), pp.6547-6556. We describe the synthesis and the physical properties of polyaromatic hydrocarbons (PAHs) containing a phosphorus atom at the edge. In particular, the impact of the successive addition of aromatic rings on the electronic properties was investigated by experimental (UV/Vis absorption, fluorescence, cyclic voltammetry) and theoretical studies (DFT). The physical properties recorded in solution and in the solid state showed that the P-containing PAHs exhibit properties expected for an emitter in white organic light-emitting diodes (WOLEDs). (10.1002/chem.201500203)
  DOI : 10.1002/chem.201500203
• Radial Junction Architecture: A New Approach to Stable and Highly Efficient Silicon Thin Film Solar Cells
  
  • Misra S.
  • Foldyna M.
  • Florea I.
  • Yu Lianbo
  • Roca I Cabarrocas P.
  MRS Online Proceedings Library, Cambridge University Press, 2015, 1770. (10.1557/opl.2015.831)
  DOI : 10.1557/opl.2015.831
• Spirobifluorene-2,7-dicarbazole-4'-phosphine Oxide as Host for High-Performance Single-Layer Green Phosphorescent OLED Devices
  
  • Thiery Sebastien
  • Tondelier Denis
  • Geffroy Bernard
  • Jacques Emmanuel
  • Robin Malo
  • Métivier Rémi
  • Jeannin Olivier
  • Rault-Berthelot Joëlle
  • Poriel Cyril
  Organic Letters, American Chemical Society, 2015, 17 (19), pp.4682–4685. A new host material based on the 2,7,4'-substituted spirobifluorene platform has been designed and used in single-layer phosphorescent OLED with very high efficiency (EQE = 13.2%) and low turn-on voltage (2.4 V). This performance is among the best reported for green single-layer PhOLEDs and may open new avenues in the design of host materials for single-layer devices. (10.1021/acs.orglett.5b02027)
  DOI : 10.1021/acs.orglett.5b02027