Improvement of inverted organic solar cells using acetic acid as an additive for ZnO layer processing
- Authors
- Li, Yang; Liu, Yawen; Liu, Zhihai; Xie, Xiaoyin; Lee, Eun-Cheol
- Issue Date
- Feb-2018
- Publisher
- AMER INST PHYSICS
- Citation
- AIP ADVANCES, v.8, no.2
- Journal Title
- AIP ADVANCES
- Volume
- 8
- Number
- 2
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/4094
- DOI
- 10.1063/1.5018382
- ISSN
- 2158-3226
- Abstract
- In this work, we used acetic acid as an additive for the preparation of ZnO layers and improved the performance of poly {4,8-bis[(2-ethylhexyl)-oxy] benzo[1,2-b: 4,5-b'] dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl) carbonyl] thieno[3,4-b] thiophene-4,6- diyl} (PTB7)-based inverted organic solar cells. The addition of acetic acid to the ZnO precursor solution improved the transparency and conductivity of the sol-gel-synthesized ZnO film, by increasing the grain size of the film. Accordingly, the power conversion efficiency (PCE) of the organic solar cells was improved from 6.42% to 7.55%, which was mainly caused by the enhanced current density and fill factor. The best sample demonstrated a high PCE of 7.85% with negligible hysteresis and good stability. Our results indicate that using acetic acid as an additive for the preparation of ZnO is a simple and effective way of fabricating high-performance inverted organic solar cells. (C) 2018 Author(s).
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