【摘 要】
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Inorganic perovskites (CsPbX3, X =halide anion), containing no volatile organic cations, exhibit better thermal stability than organic-inorganic hybrid perovski
【机 构】
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School of Metallurgy and Environment, Central South University, Changsha 410083, China;Center for Ex
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Inorganic perovskites (CsPbX3, X =halide anion), containing no volatile organic cations, exhibit better thermal stability than organic-inorganic hybrid perovskites[1, 2].Among inorganic perovskites, α-CsPbl3 (cubic phase) possesses a relatively suitable bandgap of ~1.7 eV.CsPbl3 perovskite solar cells (PSCs) have demonstrated power conversion efficiencies (PCEs) over 20%[3-5].However, either in ambient atmosphere or in glovebox, α-CsPbl3 tends to transform into a non-photoactive 6-phase (orthorhombic phase) at room temperature, leading to degraded device performance[6-8].Replacing I-with smaller Br-can stabilize the cubic phase due to the increased Goldschmidt tolerance factor.Yet the bandgap will increase from ~1.7 eV (CsPbl3) to ~2.3 eV (CsPbBr3), resulting in insufficient light absorption[9-12].
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