Eco-Friendly Solvent-Processed Fullerene-Free Polymer Solar Cells with over 9.7% Efficiency and Long-Term Performance Stability
- Authors
- Park, Gi Eun; Choi, Suna; Park, Seo Yeon; Lee, Dae Hee; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 11-10월-2017
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- large bandgap polymer; nonfullerene solar cells; nonhalogenated solvents; polymer solar cells; stability
- Citation
- ADVANCED ENERGY MATERIALS, v.7, no.19
- Indexed
- SCIE
SCOPUS
- Journal Title
- ADVANCED ENERGY MATERIALS
- Volume
- 7
- Number
- 19
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/81919
- DOI
- 10.1002/3enm.201700566
- ISSN
- 1614-6832
- Abstract
- A wide-bandgap polymer, (poly[(2,6-(4,8-bis(5-(2-ethylhexyl) thiophen2-yl)-benzo[1,2-b: 4,5-b'] dithiophene))-alt-(2,5-(methyl thiophene carboxylate))]) (3MT-Th), is synthesized to obtain a complementary broad range absorption when harmonized with 3,9-bis(2-methylene-(3-(1,1dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3d:2', 3'-d']-s-indaceno[1,2-b: 5,6-b'] dithiophene (ITIC). The synthesized regiorandom 3MT-Th polymer shows good solubility in nonhalogenated solvents. A film of 3MT-Th:ITIC can be employed for forming an active layer in a polymer solar cell (PSC), with the blend solution containing toluene with 0.25% diphenylether as a nonhalogenated additive. The corresponding PSC devices display a power conversion efficiency of 9.73%. Moreover, the 3MT-Th-based PSCs exhibit excellent shelf-life time of over 1000 h and are operationally stable under continuous light illumination. Therefore, methyl thiophene-3-carboxylate in 3MT-Th is a promising new accepting unit for constructing p-type polymers used for high-performance nonfullerene-type PSCs.
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