期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 5, 期 20, 页码 9514-9522出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta01636k
关键词
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资金
- National Nature Science Foundation of China [61674098]
- China Postdoctoral Science Foundation [2016M602759]
- National Key Research Program of China [2016YFA0202403]
- National University Research Fund [GK261001009, GK201703026, GK201603107]
- Innovative Research Team [IRT_14R33]
- Chinese National 1000-talent-plan program [111001034]
The electron transport layer (ETL), which also serves as the hole-blocking layer, is a key component in planar perovskite solar cells (PSCs). The commonly used ETL is an anatase-TiO2 (an-TiO2) film due to its excellent optical transmittance, chemical stability and semi-conducting characteristics. Nevertheless, its rough surface and plenty of surface defects often lead to a substandard perovskite film and large J-V hysteresis. Herein, a novel low-trap-density ETL is developed by surface modification of the an-TiO2 film using small-molecular ITIC. As a result, the device efficiency has been dramatically increased from 17.12% to 20.08%, entering the league of the highest planar-type perovskite cells. Moreover, the J-V hysteresis has been significantly reduced. Further investigation shows that the ITIC smoothens the TiO2 surface, passivates defects or dangling bands parasitizing the TiO2 surface, and optimizes the device band alignment. In addition, it is demonstrated that the thin ITIC promotes the formation of high quality, uniform perovskite films with better surface coverage and large grain size, implying that there is a synergistic effect between the low-trap-density ITIC and high-mobility TiO2 in improved PSC performance.
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