Thermally Induced Phase Reformation for Efficient and Photostable Wide-Bandgap Perovskite Solar Cells
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초록
내용
Despite the remarkable attraction of wide-bandgap perovskite solar cells (WBG PSCs), such as high open-circuit voltage (Voc) ＞1.2 V and complementary absorption for silicon (Si) based solar cells, their low performance and poor stability issues have been the most serious bottlenecks toward the real application of the WBG PSCs such as Si/perovskite tandem solar cells. Here, we have reported a simple thermally induced phase reformation (TPR) process of WBG perovskite crystal and revealed that the TPR process can reduce charge recombination of the WBG PSCs. By optimizing TPR process of the perovskite, we improved the power conversion efficiency (PCE) of the WBG PSCs from 15% to 18%. Furthermore, we also demonstrate that the TPR process of the perovskite results in improving operational stability of unencapsulated devices, which maintain over 90% of the initial PCEs after 12-hour operation even in ambient air condition at their maximum power points under A.M. 1.5G irradiation.