期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 30, 页码 33631-33637出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06315
关键词
perovskite solar cell; interfacial modification; band alignment; interfacial composition; PbI2-rich MAPbI(3) interface; cesium acetate treatment
资金
- Japanese Society for Promotion of Science (JSPS) [19H05636]
- Grants-in-Aid for Scientific Research [19H05636] Funding Source: KAKEN
Compositional engineering and interfacial modifications have played pivotal roles in the accomplishment of high-efficiency perovskite solar cells (PSCs). Different interfaces in the PSCs influence the performance remarkably either by altering the crystallization of the active material or shifting the energy levels or improving the electrical contact. This work reports how a thin layer of cesium acetate on the TiO2 electron transport layer (ETL) induces generation of a PbI2-rich methylammonium lead iodide (MAPbI(3)) composition at the ETL/MAPbI(3) interface, which downshifts the conduction band level of MAPbI(3) to create an energy level gradient favorable for carrier collection, resulting in higher photocurrent, fill factor, and overall power conversion efficiency.
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