All-Inorganic CsPbI2Br Perovskite Solar Cells with High Efficiency Exceeding 13%

Abstract

All-inorganic perovskite solar cells provide a promising solution to tackle the thermal instability problem of organic-inorganic perovskite solar cells. Herein, we designed an all-inorganic perovskite solar cell with novel structure (FTO/NiOx/CsPbI2Br/ZnO@C60/Ag), in which ZnO@C60 bilayer were utilized as the electron-transporting layers that demonstrated high carrier extraction efficiency and low leakage loss. Conse-quently, the as-fabricated all-inorganic CsPbI2Br perovskite solar cell yielded the power conversion efficiency (PCE) as high as 13.3% with Voc of 1.14 V, Jsc of 15.2 mAcm-2, and FF of 0.77. The corresponding stabilized power output (SPO) of device was demonstrated to be ∼ 12% and remarkably stable within 1000 s. Importantly, the obtained all-inorganic PSCs without encapsulation exhibited only 20% PCE loss with thermal treatment at 85 °C for 360 h, which largely outperformed the organic-species-containing PSCs. The present study is favorable to overcome the intractable issue concerning the thermal instability of perovskite solar cells.