Lanthanide Stabilized All-Inorganic CsPbI2Br Perovskite Solar Cells with Superior Thermal Resistance

• DOI: 10.1021/acsaem.1c00311
• Publication Date: 2021-03-31T15:36:56Z
• Authors: Libao Chen; Wen Wu; Jinpei Wang; Zongyao Qian; Ruigang Liu; Yangyang Niu; Yonghua Chen; Xiaoji Xie; Hui Zhang
• Keywords: Thermal Stability

The stability of perovskite solar cells, especially at high temperature (85 °C) conditions, is one the most critical aspects to advance practical application. All-inorganic perovskites, by substituting volatile organic compounds with cesium, have exhibited a promising thermal resistance and energy conversion potentials. However, all-inorganic cells strongly related phase transition as well each charge transport collection layer. Herein, we incorporated Eu(Ac)3 into precursor fabricate photoactive γ-CsPbI2Br. Eu3+ ions can associate negatively charged halide plumbates in solution accumulate grain boundaries as-achieved thin films, effectively reducing nonradiative recombination centers stabilizing γ-CsPbI2Br moderate size. A champion efficiency above 12% an inverted device architecture be achieved. In presence ions, nonperovskite significantly mitigated reversibly restored via repairing. Moreover, thermally treat electron [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) layer prior completion induce nanomorphology reorientation replace reactive Ag electrode inert Cu prevent corrosion diffusive from perovskite. As result, (at 85 °C, time 80% initial or t80 ≈ 200 h) moisture (relative humidity RH = 40%, > 500 CsPbI2Br remarkably enhanced.