期刊
APPLIED MATERIALS TODAY
卷 20, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apmt.2020.100644
关键词
Element substitution; Inorganic perovskite; Phase stability; Printable solar cells
资金
- National Key Research and Development Program of China [2018YFB1502900]
- National Natural Science Foundation of China Major International (Regional) Joint Research Project [51661135023, 51961165106]
- National Natural Science Foundation of China [21673091, 21975088]
- Fundamental Research Funds for the Central Universities [2018KFYXKJC034, 2019kfyRCPY040]
- China-EU Institute for Clean and Renewable Energy [3011187029]
- Innovation Fund Project of Hebei University of Engineering [SJ010002139]
Inorganic perovskites such as CsPbI2Br have attracted much attention owing to their intrinsic merits of thermal stability. However, the phase instability of CsPbI2Br in real-world operating conditions remains a major impediment to its prospective applications. Herein we report a method on enhancing the phase stabilization of inorganic perovskite CsPbI2Br and device performance in corresponding device engaged by Mg2+ ion substitution. Owing to small ionic radius and superior electron donating ability of Mg2+, a well-match in crystalline lattices between Cs+ and cubooctahedral void of Mg-substituted perovskite compounds and the reduced interaction between water molecules and perovskite all can offer stable perovskite phase of CsPbxMg1-xI2Br in ambient atmosphere. Moreover, we observed the enlarged charge diffusion lengths and more faster charge transportation rate for Mg-substituted perovskite-based device. Consequently, the resultant perovskite solar cell using CsPbxMg1-xI2Br with a full printable framework of FTO/c-TiO2/m-TiO2/Al2O3/NiO/carbon achieves a power conversion efficiency of 10.8%. We further noticed that a common phenomenon of energy loss in mesoporous perovskite solar cells can be significantly reduced in the case of CsPb0.98Mg0.02I2Br. (c) 2020 Elsevier Ltd. All rights reserved.
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