An insight on oxide interlayer in organic solar cells: From light absorption and charge collection perspectives |
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| Affiliation: | 1. Department of Photonics Engineering, Yuan Ze University, Taoyuan, Taiwan, ROC;2. Department of Electronic Engineering, Ming Chuan University, Taoyuan, Taiwan, ROC;3. Center for Measurement Standards, Industrial Technology Research Institute, Hsinchu, Taiwan, ROC;1. Brazilian Nanotechnology National Laboratory (LNNano), CNPEM, 13083-970, Campinas, Brazil;2. Institute of Physics “Gleb Wataghin” (IFGW), UNICAMP, 13083-859, Campinas, Brazil;3. Department of Physical Chemistry, Institute of Chemistry (IQ), UNICAMP, 13083-970, Campinas, Brazil;1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan, Shandong, 250100, People''s Republic of China;2. ARC Centre of Excellence in Exciton Science, School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia |
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| Abstract: | A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly4,8-bis(2-ethylhexyl)oxy] benzo 1,2-b:4,5-b'] dithiophene-2,6- diyl] 3-fluoro-2-(2-ethylhexyl)carbonyl] thieno 3,4-b] thiophenediyl]] (PTB7): 6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7:PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7:PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in ～20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer. |
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| Keywords: | Transient photocurrent Oxide/organic hetero-interface Charge collection efficiency Interfacial exciton dissociation Absorption enhancement |
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