Journal
CURRENT APPLIED PHYSICS
Volume 18, Issue 5, Pages 505-511Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2018.02.012
Keywords
PffBT4T-2OD; Nanoparticles ZnO; Sol-gel ZnO; Bilayer ZnO; Electron transporting layer
Funding
- Future Solar Technologies Pty. Ltd.
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Solution processed solar cells are a promising renewable energy technology due to the low fabrication costs. The most commonly used electron transport layer for solution processed organic solar cells is ZnO. However, sol-gel derived ZnO is amorphous, which limits interfacial charge transport. In this study, we demonstrate a ZnO bilayer, composed of a nanoparticle ZnO and sol-gel derived ZnO layer, as the electron transport layer in polymer solar cells incorporating the novel polymer 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). Compared with the single layer sol-gel ZnO, the bilayer displayed enhanced crystallinity. Consequently, the interfacial transport from the active layer was improved, as evidenced by dark J-V and PL spectroscopy measurements. Solar cells incorporating this bilayer ZnO layer achieved PCE values exceeding 10%, a relative improvement of 25% compared to the sol-gel ZnO devices. (C) 2018 Korean Physical Society. Published by Elsevier B.V. All rights reserved.
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