| 초록 |
All-inorganic perovskite solar cells have attracted attention due to their excellent optical properties and high thermal stability, but energy loss in the photovoltaic performances is a challenge due to the trap-assisted recombination loss at the imperfect film morphology. In this work, we demonstrated the optimization of α-CsPbI2Br morphology including low defect density and large grain size by employing cesium chloride (CsCl) as an additive. The high-quality CsPbI2Br film grown with CsCl additive reveals high crystallinity and largely-grained morphology, which provides significantly reduced defect density and energy loss. As a result, we optimized the CsPbI2Br device with 1% CsCl additive, which shows power conversion efficiency (PCE) of 11.04% with a record open circuit voltage (VOC) of 1.33 V. The CsPbI2Br with CsCl showed good stability maintaining ＞60% of the initial efficiency being aged for ＞600 h in ambient atmosphere. |
