Abstract
As a third-generation solar cell technology, perovskite solar cells are facing booming growth. However, typical perovskite solar cells have two critical challenges on the road to actual commercialization: toxicity and stability. Finding high-performance lead-free inorganic perovskites to replace conventional lead-based perovskites is an effective way to overcome both challenges. A lead-free inorganic perovskite Cs2TiBr6 has been demonstrated that possesses the impressive photoelectric property of direct bandgap and excellent environmental stability from recent experimental results. In addition, Cs2TiBr6 has been used as the absorber layer in a perovskite solar cell with an efficiency of 3.28%, which is lower than the efficiencies of typical lead-based perovskite cells. Therefore, it is significant to further explore the structure of Cs2TiBr6 solar cell for improving its power conversion efficiency. This work proposes a solar cell with the FTO/ETL/Cs2TiBr6/HTL/Au structure, then selects the most suitable hole and electron transport materials among some typical transport materials. Moreover, we optimize the absorber layer thickness. The optimized solar cell with the FTO/SnO2/Cs2TiBr6/PEDOT:PSS/Au structure possesses an efficiency of 7.92%. Our results show that lead-free inorganic perovskite Cs2TiBr6 used as an absorber in the solar cell has great potential. In addition, appropriate hole transport material, electron transport material, and absorber layer thickness can improve its performance.
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