Phthalimide-Based High Mobility Polymer Semiconductors for Efficient Nonfullerene Solar Cells with Power Conversion Efficiencies over 13%
- Authors
- Yu, Jianwei; Chen, Peng; Koh, Chang Woo; Wang, Hang; Yang, Kun; Zhou, Xin; Liu, Bin; Liao, Qiaogan; Chen, Jianhua; Sun, Huiliang; Woo, Han Young; Zhang, Shiming; Guo, Xugang
- Issue Date
- 23-1월-2019
- Publisher
- WILEY
- Keywords
- difluorobenzothiadiazole; high mobility polymers; high power conversion efficiencies; nonfullerene polymer solar cells; phthalimide
- Citation
- ADVANCED SCIENCE, v.6, no.2
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED SCIENCE
- Volume
- 6
- Number
- 2
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68255
- DOI
- 10.1002/advs.201801743
- ISSN
- 2198-3844
- Abstract
- Highly efficient nonfullerene polymer solar cells (PSCs) are developed based on two new phthalimide-based polymers phthalimide-difluorobenzothiadiazole (PhI-ffBT) and fluorinated phthalimide-ffBT (ffPhI-ffBT). Compared to all high-performance polymers reported, which are exclusively based on benzo[1,2-b:4,5-b']dithiophene (BDT), both PhI-ffBT and ffPhI-ffBT are BDT-free and feature a D-A(1)-D-A(2) type backbone. Incorporating a second acceptor unit difluorobenzothiadiazole leads to polymers with low-lying highest occupied molecular orbital levels (approximate to-5.6 eV) and a complementary absorption with the narrow bandgap nonfullerene acceptor IT-4F. Moreover, these BDT-free polymers show substantially higher hole mobilities than BDT-based polymers, which are beneficial to charge transport and extraction in solar cells. The PSCs containing difluorinated phthalimide-based polymer ffPhI-ffBT achieve a substantial PCE of 12.74% and a large V-oc of 0.94 V, and the PSCs containing phthalimide-based polymer PhI-ffBT show a further increased PCE of 13.31% with a higher J(sc) of 19.41 mA cm(-2) and a larger fill factor of 0.76. The 13.31% PCE is the highest value except the widely studied BDT-based polymers and is also the highest among all benzothiadiazole-based polymers. The results demonstrate that phthalimides are excellent building blocks for enabling donor polymers with the state-of-the-art performance in nonfullerene PSCs and the BDT is not necessary for constructing such donor polymers.
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