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Bicontinuous network of electron donor-acceptor composites achieved by additive-free sequential deposition for efficient polymer solar cells
- Title
- Bicontinuous network of electron donor-acceptor composites achieved by additive-free sequential deposition for efficient polymer solar cells
- Authors
- Choi Y.; Lee B.H.; Kim H.
- Ewha Authors
- 이병훈
- SCOPUS Author ID
- 이병훈
- Issue Date
- 2020
- Journal Title
- Current Applied Physics
- ISSN
- 1567-1739
- Citation
- Current Applied Physics vol. 20, no. 6, pp. 760 - 764
- Keywords
- Bilayer; Bulkheterojunction; Nanomorphology; Organic solar cell; Sequential deposition
- Publisher
- Elsevier B.V.
- Indexed
- SCIE; SCOPUS; KCI
- Document Type
- Article
- Abstract
- We report that sequential deposition of a highly crystalline polymer donor and a soluble fullerene acceptor leads to a well-defined interpenetrating network and enhanced power conversion efficiencies in bilayer polymer solar cells. Even without the use of solvent additives, layered thin films of poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3‴-di(2-octyldodecyl)-2,2’; 5′,2’’; 5″,2‴-quaterthiophen-5,5‴-diyl)] (PffBT4T-2OD) and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM), as electron donor and acceptor materials, respectively, showed bicontinuous networks similar to those of a PffBT4T-2OD:PC71BM bulk-heterojunction (BHJ) thin film processed with 1,8-diiodooctane (DIO) as a solvent additive. Transmission electron microscopy results confirmed the BHJ-like morphology of the bilayered PffBT4T-2OD/PC71BM thin films. Bilayer solar cells fabricated without the DIO additive produced a power conversion efficiency of η ≈ 7.65%, which is even higher than that of a BHJ solar cell fabricated with the DIO additive (η ≈ 7.04%). These results demonstrate that a highly crystalline polymer donor and an electron-accepting small molecule can be a good combination for efficient bilayer polymer solar cells. © 2020 Korean Physical Society
- DOI
- 10.1016/j.cap.2020.03.011
- Appears in Collections:
- 공과대학 > 화공신소재공학과 > Journal papers
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