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Influence of thermal annealing on the charge generation and transport in PM6-based non-fullerene solar cells |
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| Authors: | Hu Rong Liu Yurong Tian Liangliang Zhang Wei He Xiaochuan |
| Affiliation: | 1.School of Materials Science and Engineering, Chongqing University of Arts and Sciences, Chongqing, 402160, People’s Republic of China ;2.School of Physics and Electronic Engineering, Guangzhou University, Guangzhou, 510006, People’s Republic of China ;3.College of Materials Science and Engineering, Sichuan University, Chengdu, 610065, People’s Republic of China ;4.Songshan Lake Materials Laboratory, Dongguan, 523808, Guangdong, People’s Republic of China ; |
| Abstract: | To study the influence of thermal annealing on the charge generation and transport in PM6-based non-fullerene solar cells. Morphology, optical and electrochemical properties of active layers as well as electrical properties of polymer solar cells were studied. Furthermore, the photoelectric conversion processes of annealed and unannealed devices were also examined by means of time resolved spectroscopy. The results showed that thermal annealing had a weak influence on the dynamics of exciton states. Besides, annealed device is found to suppress bimolecular recombination owing to its higher charge carrier mobility in ordered donor and acceptor aggregation phases, which led to higher photocurrent and power conversion efficiency than unannealed photovoltaic device. |
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