期刊
SOLAR RRL
卷 3, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800289
关键词
perovskite; stability; stearic acid; surface-treated PCBM
资金
- Global Frontier Program through Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013M3A6 B1078874]
- NRF Grant - Korea Government [NRF-2016R1A2B4011474]
Having achieved power conversion efficiencies higher than 22%, perovskite solar cells (PSCs) look set to be game changers in the field of photovoltaics. Their instability in humid environments, however, reduces their potential for commercialization. In this study, the role chemical degradation plays in moisture-affected devices is investigated, and, based on this concept, a technique that enhances the device stability of p-i-n PSCs is developed. By surface treatment of the [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) layer with hydrophobic stearic acid and ethylenediamine, increased moisture resistivity of PCBM is achieved. The treated surface of the PCBM layer improves hydrophobicity, with a contact angle of 108 degrees, and also prevents water ingress in the perovskite layer longer than non-treated surfaces. In addition, interfacial stability is enhanced by the suppressed interaction between the ions and the electrodes, resulting in treated devices exhibiting improved stability in their photovoltaic parameters compared to non-treated devices when exposed to a dark environment with a relative humidity of 45%.
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