Carbon-Based All-Inorganic CsPbI2Br Perovskite Solar Cells Using TiO2 Nanorod Arrays: Interface Modification and the Enhanced Photovoltaic Performance

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Abstract
Recently, carbon-based all-inorganic perovskite solar cells (PSCs) catch the attention of photovoltaic researchers due to their remarkable stability. Herein, we report a carbon based all-inorganic CsPbI2Br PSCs using TiO2 nanorod arrays (TiO2 NRAs) as electron transporting layer. The method of using TiO2 NRAs as an electron pathway has the advantage of increasing the electron-hole separation effectively and enables a thicker active perovskite layer to obtain a stronger absorbance. In addition, a water alcohol soluble CsCl was used to modify the interface between TiO2 NRAs and CsPbI2Br active layer to reduce interfacial recombination of charge carriers in the cells, and CsCl interface modified device show 10.6% increase in the open-circuit voltage. The optimized power conversion efficiency of 11.45% has been obtained, which is one of the superior performances reported for the carbon-based pure CsPbI2Br perovskite solar cells to date.
Funding Information
  • National Natural Science Foundation of China (21676146)
  • Priority Academic Program Development of Jiangsu Higher Education Institutions
  • State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University

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