Applications and functions of rare-earth ions in perovskite solar cells
Limin Cang(苍利民)1, Zongyao Qian(钱宗耀)2, Jinpei Wang(王金培)2, Libao Chen(陈利豹)2, Zhigang Wan(万志刚)1, Ke Yang(杨柯)1, Hui Zhang(张辉)2,†, and Yonghua Chen(陈永华)2,‡
1 Research Center, Ancai Hi-Tech Co., Ltd., Anyang 455000, China; 2 Key Laboratory of Flexible Electronics, Institute of Advanced Materials, Nanjing Tech University, Nanjing 211800, China
Abstract The emerging perovskite solar cells have been recognized as one of the most promising new-generation photovoltaic technologies owing to their potential of high efficiency and low production cost. However, the current perovskite solar cells suffer from some obstacles such as non-radiative charge recombination, mismatched absorption, light induced degradation for the further improvement of the power conversion efficiency and operational stability towards practical application. The rare-earth elements have been recently employed to effectively overcome these drawbacks according to their unique photophysical properties. Herein, the recent progress of the application of rare-earth ions and their functions in perovskite solar cells were systematically reviewed. As it was revealed that the rare-earth ions can be coupled with both charge transport metal oxides and photosensitive perovskites to regulate the thin film formation, and the rare-earth ions are embedded either substitutionally into the crystal lattices to adjust the optoelectronic properties and phase structure, or interstitially at grain boundaries and surface for effective defect passivation. In addition, the reversible oxidation and reduction potential of rare-earth ions can prevent the reduction and oxidation of the targeted materials. Moreover, owing to the presence of numerous energetic transition orbits, the rare-earth elements can convert low-energy infrared photons or high-energy ultraviolet photons into perovskite responsive visible light, to extend spectral response range and avoid high-energy light damage. Therefore, the incorporation of rare-earth elements into the perovskite solar cells have demonstrated promising potentials to simultaneously boost the device efficiency and stability.
Fund: Project supported by the National Key R&D Program of China (Grant No. 2020YFA07099003), Six Talent Peaks Project of Jiangsu Province, China (Grant No. 2019-XNY-013), and a fellowship from the China Postdoctoral Science Foundation (Grant No. 2020M672181).
Limin Cang(苍利民), Zongyao Qian(钱宗耀), Jinpei Wang(王金培), Libao Chen(陈利豹), Zhigang Wan(万志刚), Ke Yang(杨柯), Hui Zhang(张辉), and Yonghua Chen(陈永华) Applications and functions of rare-earth ions in perovskite solar cells 2022 Chin. Phys. B 31 038402
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