Journal
NANO ENERGY
Volume 61, Issue -, Pages 148-157Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2019.04.042
Keywords
Inorganic hole transporting materials; Doping; Energy alignment; Stability; Perovskite solar cells
Categories
Funding
- National Natural Science Foundation of China [21773218]
- key research and development projects of Sichuan province [2017GZ0052]
- Anshan Hifichem Co. Ltd
- Jiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and Technology
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Despite incredible success has been achieved for perovskite solar cells (PSCs) in pursuing high power conversion efficiency (PCE), their practical application is prevented by the low stability issues, especially an accelerating stability test at high temperature still needs to be demonstrated. Herein, we present an inverted mesoscopic PSCs with Zn2+ doped CuGaO2 (Zn:CuGaO2) as both the scaffold and hole transporting materials (HTM). Both theoretical and experimental results indicate that the carrier density and conductivity of CuGaO2 is significantly improved via Zn2+ doping, which is beneficial for the hole transfer. Moreover, the mesoporous structure combined with the well matched energy levels between Zn:CuGaO2 and perovskite can effectively extract holes from perovskite, reduce charge transfer barrier, and depress the charge-carrier recombination. As a result, the champion device with Zn:CuGaO2 as HTM gives a power conversion efficiency of 20.67% from reverse scan and a stabilized efficiency of 20.15%, which is among the best results for PSCs based on methylammonium-free, cesium-formamidinium (Cs-FA) double-cation perovskite and inorganic HTM. Moreover, PCE of the unencapsulated device retains over 85% after thermal annealing at 85 degrees C for 1000 h in a nitrogen atmosphere, demonstrating the superior thermal stability of the present PSCs with the metal doped inorganic HTM.
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