Prof. JunYoung Kim Profile

Prof. JunYoung Kim

at Gyeongsang National University

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Proceedings Article | 12 March 2024 Poster

Inverted organic solar cell using ZnO interfacial layer with low temperature process

Jun Young Kim

Proceedings Volume PC12883, PC128830G (2024) https://doi.org/10.1117/12.3002371

KEYWORDS: Zinc oxide, Solar cells, Organic photovoltaics, Sol gels, Thin films, Nanoparticles, Thin film solar cells, Surface roughness, Surface properties, Resistance

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This study applies various ZnO thin films (sol-gel process based on high and low temperature and nanoparticle process) as electron extraction layer in inverted organic solar cells based on PBDB-T:ITIC, and the correlation between ZnO and solar cell performance was analyzed. When the ZnO thin film was formed by the high temperature(450°C) sol-gel process, the sheet resistance of ITO electrode was increased up to 5 times. As a result, the power conversion efficiency was low at 4.12%. In the nanoparticle process, butanol-based ZnO has better dispersion and surface properties than IPA-based ZnO, resulting in improved organic solar cell performance (PCE of 6.35% and 4.58% with butanol and IPA-based ZnO respectively). In addition, ZnO precursor solution with a low-temperature (150°C) sol-gel process was developed, and as a result of applying it as an electron extraction layer of an inverted organic solar cell, the device performance was greatly improved (PCE of 8.89%). The main reason for the improvement of the device performance is that the ripple-shaped surface is formed, which facilitates extraction of electrons and has excellent surface roughness.

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