Trap-limited bimolecular recombination in poly(3-hexylthiophene): Fullerene blend films |
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| Affiliation: | 1. State Key Laboratory of Supramolecular Structures and Materials, Jilin University, 2699 Qianjin Street, Changchun 130012, China;2. Optical Condensed Matter Physics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, NL-9747AG Groningen, The Netherlands;3. Physics Institute 2, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany;1. Department of Electrophysics, National Chiayi University, Chiayi, 600, Taiwan;2. Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan;1. School of Chemical and Physical Sciences (SCPS), Victoria University of Wellington, New Zealand;2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, PR China;3. Centre for Theoretical Chemistry and Physics (CTCP), New Zealand Institute for Advanced Study, Massey University Auckland, New Zealand;1. Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA;2. Department of Chemistry, University of Wisconsin-Madison, Madison, WI 53706, USA |
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| Abstract: | Trap-limited bimolecular recombination in poly(3-hexylthiophene) (P3HT) and 6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) blend films has been investigated by using photo-induced charge extraction by linearly increasing voltage (photo-CELIV) method. The bimolecular recombination rate is strongly dependent on the photoexcitation density, the PC61BM composition and the thermal annealing process, but it slightly depends on the thickness of the blend film. The results show that the trap-limited bimolecular recombination is strongly affected by the distribution of the density of trap state (trap DOS). The higher trap-limited bimolecular recombination rate means the trap DOS centered at lower energy which is beneficial to charge carriers transportation, due to the lower activation energy and faster release rate. On the other hand, the trap-limited bimolecular recombination rate is mainly controlled by the slower species of charge carriers in the blend film when the transport of electrons and holes are strongly unbalanced, and the recombination rate will increase when the transport of electrons and holes becomes more balanced. |
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| Keywords: | Photo-CELIV Bimolecular recombination Trap DOS |
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