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Localized incorporation of cesium ions to improve formamidinium lead iodide layers in perovskite solar cells

Authors :
Chunxiao Gao
Jiaqi Tian
Haiyue Wang
Honggang Xie
Bo Zheng
Shanshan Zhu
Xizhe Liu
Yebin Xue
Source :
RSC Advances. 8:25645-25652
Publication Year :
2018
Publisher :
Royal Society of Chemistry (RSC), 2018.

Abstract

For the perovskite solar cells with formamidinium lead iodide (FAPbI3) as a light harvester, cesium ions (Cs+) can be used to stabilize the perovskite crystal structure of FAPbI3. However, the incorporation of Cs+ ions usually reduces the grain size and degrades the crystallization of FAPbI3 layers, and this is harmful to the photovoltaic performance of solar cells. In this work, we incorporate Cs+ ions into FAPbI3 layers using the interfacial doping method, which is different from the mixed solution doping method in previous reports. Elemental analysis indicates that Cs+ dopants cannot be detected at the outer surfaces of perovskite layers, and the majority of Cs+ dopants should be localized in the vicinity of TiO2/perovskite interfaces, which is remarkably different from the distribution of Cs+ dopants in the perovskite layers prepared using the mixed solution doping method. It is found that interfacial doping method can avoid the blue shift of the light absorption edge and can improve the crystallization of FAPbI3 layers. For the optimized conditions, CsxFA1−xPbI3 solar cells prepared using the interfacial doping method achieve a power conversion efficiency (PCE) of 17.1%, which is better than the PCE of CsxFA1−xPbI3 devices prepared using the mixed solution doping method.

Details

ISSN :
20462069
Volume :
8
Database :
OpenAIRE
Journal :
RSC Advances
Accession number :
edsair.doi.dedup.....8aee7558e23f00f5d6512d430b894f52
Full Text :
https://doi.org/10.1039/c8ra04742a