期刊
APPLIED PHYSICS LETTERS
卷 106, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4916345
关键词
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资金
- National High Technology Research and Development Program [2015AA050601]
- National Basic Research Program of China [2011CB933300]
- National Natural Science Foundation of China [61376013, 91433203, J1210061]
- Natural Science Foundation of Jiangsu Province [BK20131186]
- Suzhou Science and Technology Bureau [SYG201449]
In this letter, we report perovskite solar cells with thin dense Mg-doped TiO2 as hole-blocking layers (HBLs), which outperform cells using TiO2 HBLs in several ways: higher open-circuit voltage (V-oc) (1.08 V), power conversion efficiency (12.28%), short-circuit current, and fill factor. These properties improvements are attributed to the better properties of Mg-modulated TiO2 as compared to TiO2 such as better optical transmission properties, upshifted conduction band minimum (CBM) and downshifted valence band maximum (VBM), better hole-blocking effect, and higher electron life time. The higher-lying CBM due to the modulation with wider band gap MgO and the formation of magnesium oxide and magnesium hydroxides together resulted in an increment of V-oc. In addition, the Mg-modulated TiO2 with lower VBM played a better role in the hole-blocking. The HBL with modulated band position provided better electron transport and hole blocking effects within the device. (C) 2015 AIP Publishing LLC.
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