Journal
ACS NANO
Volume 12, Issue 6, Pages 5605-5614Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b01351
Keywords
ZnSe; low-temperature solution process; perovskite solar cell; hysteresis; photostability
Categories
Funding
- National Natural Science Foundation of China [51572098, 51272080]
- Fund for Strategy Emerging Industries of Shenzhen [JCY20150630155150208]
- Open Fund of State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2016-KF-5]
- Graduates' Innovation Fund
- Huazhong University of Science and Technology
- Technology innovation fund project of Huazhong University of Science and Technology Innovation Research College
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For a typical perovskite solar cell (PKSC), the electron transport layer (ETL) has a great effect on device performance and stability. Herein, we manifest that low-temperature solution-processed ZnSe can be used as a potential ETL for PKSCs. Our optimized device with ZnSe ETL has achieved a high power conversion efficiency (PCE) of 17.78% with negligible hysteresis, compared with the TiO2 based cell (13.76%). This enhanced photovoltaic performance is attributed to the suitable band alignment, high electron mobility, and reduced charge accumulation at the interface of ETL/perovskite. Encouraging results were obtained when the thin layer of ZnSe cooperated with TiO2. It shows that the device based on the TiO2/ZnSe ETL with cascade conduction band level can effectively reduce the interfacial charge recombination and promote carrier transfer with the champion PCE of 18.57%. In addition, the ZnSe-based device exhibits a better photostability than the control device due to the greater ultraviolet (UV) light harvesting of the ZnSe layer, which can efficiently prevent the perovskite film from intense UV-light exposure to avoid associated degradation. Consequently, our results present that a promising ETL can be a potential candidate of the n-type ETL for commercialization of efficient and photostable PKSCs.
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