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- Title
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
- Abstract
Summary: 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.
- Subjects
FULLERENE polymers; SOLAR cells; DOPING agents (Chemistry); POLYMER blends; CHARGE transfer; EXCITON theory; CHARGE carrier mobility
- Publication
International Journal of Energy Research, 2022, Vol 46, Issue 7, p8716
- ISSN
0363-907X
- Publication type
Article
- DOI
10.1002/er.7751