Determination of diffusion lengths in organic semiconductors: Correlation with solar cell performances |
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| Affiliation: | 1. GEEPS, CNRS, CentraleSupelec, UPSud, UPMC, 11 Rue Joliot Curie, 91192, Gif sur Yvette, France;2. IFIS-Litoral, Güemes 3450, S3000GLN, Santa Fe, Argentina;3. TFSC-Instrument, 3 Rue Léon Blum, 91120, Palaiseau, France;4. Université Grenoble-Alpes, INES, F-73375, Le Bourget du lac, France;5. CEA, LITEN, Department of Solar Technologies, F-73375, Le Bourget du lac, France;1. Dept. of Eng. Physics and Mathematics, Faculty of Eng., Ain Shams University, Cairo, Egypt;2. Dept. of Electronics and Communications, Faculty of Eng., Ain Shams University, Cairo, Egypt;1. Department of Electronic Engineering, Southern Taiwan University of Science and Technology, Tainan City 71005, Taiwan;2. Institute of Microelectronics and Department of Electrical Engineering, National Cheng Kung University, Tainan City 70101, Taiwan;6. Department of Digestive and Hepato-Pancreato-Biliary Surgery, La Pitié-Salpêtrière Hospital, AP–HP, UPMC Univ Paris 06, France;7. Department of Hepato-gastro-enterology, La Pitié-Salpêtrière Hospital, AP–HP, UPMC Univ Paris 06, 47-80, boulevard de l’Hôpital, 75013 Paris, France;8. Department of Anesthesiology and Critical Care Medicine; University Hospital, Dijon, France;9. Department of Anesthesiology and Critical Care Medicine, La Pitié-Salpêtrière Hospital, AP–HP, UPMC Univ Paris 06, France;10. Unit of Renal Transplantation, Department of Urology, La Pitié-Salpêtrière Hospital, AP–HP, UPMC Univ Paris 06, France;2. UMR-S 945, La Pitié-Salpêtrière Hospital, Institut national de la santé et de la recherche médicale, AP–HP, université Paris 06, université Pierre-et-Marie-Curie, 75013 Paris, France;3. Department of Digestive and Hepato-Pancreato-Biliary Surgery, AP–HP, La Pitié-Salpêtrière Hospital, université Paris 06, université Pierre-et-Marie-Curie, 75013 Paris, France;4. Inserm, U1082, plateform IBISA, université de Poitiers, faculté de médecine et de pharmacie, 86021 Poitiers, France;5. ER4 “Modélisation en recherche clinique”, université Paris 06, université Pierre-et-Marie-Curie et UF de biostatistique, La Pitié-Salpêtrière Hospital, 75013 Paris, France;1. Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), CentraleSupélec-Université de Lorraine, 57070 Metz, France;2. Laboratoire SYMME, Université Savoie Mont Blanc, 74944 Annecy-le-Vieux, France;3. Institut Jean Lamour (IJL), UMR 7198 Université de Lorraine-CNRS, 54506 Vandoeuvre-lès-Nancy, France |
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| Abstract: | Organic semiconductors are promising candidates for future applications in solar energy conversion. Recent investigations of bulk heterojunction (BHJ) semiconductors have suggested a density of states and transport mechanisms by multiple trapping close to those observed in disordered inorganic thin films. That is why we have applied to BHJ thin films experiments that are currently used for disordered semiconductors. In addition to the steady state photoconductivity we have tested the ability of the steady state photocarrier grating (SSPG) technique to provide information on the minority carrier diffusion length. We found that SSPG can be applied to P3HT:PCBM thin films leading, for the best sample, to a diffusion length of the order of 125 nm. From the comparison of the transport parameters obtained on thin films with the performances of the devices integrating the latter, we conclude that SSPG is a very powerful tool for optimizing the BHJ thin film properties before their incorporation in solar devices. |
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| Keywords: | Organic semiconductors Transport properties Solar cells |
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