https://scholars.lib.ntu.edu.tw/handle/123456789/467372
Title: | Effect of copper oxide oxidation state on the polymer-based solar cell buffer layers | Authors: | Lien, H.-T. Wong, D.P. Tsao, N.-H. Huang, C.-I. Su, C. Chen, K.-H. CHING-I HUANG Chen, L.-C. |
Issue Date: | 2014 | Journal Volume: | 6 | Journal Issue: | 24 | Start page/Pages: | 22445-22450 | Source: | ACS Applied Materials and Interfaces | Abstract: | Transporting buffer layers are important components of polymer-based organic photovoltaic devices. In this study, we have investigated the effects of the oxidation state in copper oxide based buffer layer in conjunction to its role in device performance. We have shown that variation in the oxidation state affects the band alignment and built-in voltage of the device, therefore leading to variation in device performance. Specifically, the fully oxidized copper oxide buffer layer has a valence band position at 5.12 eV, much closer to the highest occupied molecular orbital of poly(3-hexylthiophene-2,5-diyl) (P3HT) (∼5.2 eV), giving a best fill factor and efficiency at 57% and 4.06%, respectively. Lastly, we also demonstrate significant enhancement in device stability, with power conversion efficiency maintained at 75% of the original value even after 40 days, and propose a strategy for recovering the device performance based on the observed property of the oxide buffer layer. © 2014 American Chemical Society. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/467372 | DOI: | 10.1021/am5064469 | SDG/Keyword: | Buffer layers; Efficiency; Molecular orbitals; Organic solar cells; Oxidation; X ray absorption; Device performance; Highest occupied molecular orbital; Organic photovoltaic devices; Oxide buffer layers; Photovoltaics; Poly(3-hexylthiophene-2 ,5-diyl); Polymer-based solar cells; Power conversion efficiencies; Copper oxides |
Appears in Collections: | 高分子科學與工程學研究所 |
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