Equally high efficiencies of organic solar cells processed from different solvents reveal key factors for morphology control
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- Linköping University (Sweden)
- Soochow University, Suzhou (China)
- Jilin Univ., Changchun (China)
- Czech Academy of Sciences (CAS), Prague (Czech Republic)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Univ. of Arizona, Tucson, AZ (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- The Chinese University of Hong Kong, Ma Liu Shui, Shatin (Hong Kong)
- Soochow University, Suzhou (China); Chinese Academy of Sciences (CAS), Beijing (China)
The power conversion efficiency of organic solar cells (OSCs) is exceeding 20%, an advance in which morphology optimization has played a significant role. It is generally accepted that the processing solvent (or solvent mixture) can help optimize morphology, impacting the OSC efficiency. Here we develop OSCs that show strong tolerance to a range of processing solvents, with all devices delivering high power conversion efficiencies around 19%. By investigating the solution states, the film formation dynamics and the characteristics of the processed films both experimentally and computationally, we identify the key factors that control morphology, that is, the interactions between the side chains of the acceptor materials and the solvent as well as the interactions between the donor and acceptor materials. Our work provides new understanding on the long-standing question of morphology control and effective guides to design OSC materials towards practical applications, where green solvents are required for large-scale processing.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- National Natural Science Foundation of China (NSFC); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 2497302
- Journal Information:
- Nature Energy, Journal Name: Nature Energy Vol. 10; ISSN 2058-7546
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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