期刊
ACS APPLIED ENERGY MATERIALS
卷 4, 期 4, 页码 3255-3264出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c03036
关键词
inorganic perovskite solar cell; commercial carbon; cesium acetate; interface engineering; efficiency
资金
- Natural Science Foundation of China [21676146]
- Financial Foundation of State Key Laboratory of Materials-Oriented Chemical Engineering [ZK202009]
This study successfully enhanced the photovoltaic performance of CsPbI2.25Br0.75 perovskite solar cells by using TiO2 nanorod arrays and cesium acetate modification at the interface of the electron transport layer. The optimization efficiency of the device reached a record-breaking level, emphasizing the critical importance of interface engineering.
The past few years have witnessed the rapid development of all-inorganic perovskite solar cells (PSCs). The interface of the electron transport layer (ETL)/perovskite is the vital charge separation site in all-inorganic PSCs. In this study, TiO2 nanorod arrays (NAs) were employed as electron transport layers in CsPbI2.25Br0.75 perovskite solar cells for enhancing the photovoltaic performance. Commercially available carbon was also used instead of the expensive hole transport materials and noble metals. The interface of TiO2/perovskite was further modified with cesium acetate (CsAc) to reduce the interface defect and the carrier recombination. The surface morphology, crystal structure, photoelectric property, and photovoltaic performance of the solar device were systematically investigated. More importantly, the device based on the CsAc-modified ETL/perovskite interface produced an optimization efficiency of 13.81%, which represents a record-breaking power conversion efficiency for carbon-based all-inorganic PSCs to date. This study emphasizes the critical importance of interface engineering of the ETL/perovskite and opens the door to the fabrication of carbon-based all-inorganic PSCs with high efficiency.
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