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Enhanced dissociation of excitons and charge transfer in organic solar cells of polymer: Fullerene blends with molecular BPFZn doping
- Authors
- Meresa, Alem Araya; Parida, Bhaskar; Long, Dang Xuan; Kim, Donguk; Kim, Taemin; Earmme, Taeshik; Hong, Jongin; Kang, Dong-Won; Kim, Felix Sunjoo
- Issue Date
- Jun-2022
- Publisher
- John Wiley and Sons Ltd
- Keywords
- exciton dissociation; molecular doping; organic solar cell; polymer:fullerene bulk heterojunction
- Citation
- International Journal of Energy Research, v.46, no.7, pp 8716 - 8725
- Pages
- 10
- Journal Title
- International Journal of Energy Research
- Volume
- 46
- Number
- 7
- Start Page
- 8716
- End Page
- 8725
- ISSN
- 0363-907X
1099-114X
- Abstract
- We introduce bis(pentafluorophenyl)zinc (BPFZn) as a molecular dopant in an organic solar cell (OSC) system based on polymer:fullerene blends to improve the efficiency of exciton dissociation and balance charge-carrier mobilities. We employ PC71BM as an acceptor along with PTB7-Th as a donor to form bulk heterojunctions. The maximum power conversion efficiency increases from 7.7% without doping to 8.7% upon BPFZn doping at a concentration of 0.01 wt %. The fill factor, which is increased from 50.7% to 57.8%, is the main device parameter of enhancement. An optimal concentration of BPFZn promotes splitting of exciton and suppresses charge recombination in the PTB7-Th:PC71BM OSCs. Additionally, balanced carrier mobilities are observed in the moderately doped blends. © 2022 John Wiley & Sons Ltd.
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