Pb‐Bi Binary Metal All‐Inorganic Absorber Layer for Stability Enhancement in Perovskite Solar Cells

• DOI: 10.1002/admi.201900517
• Publication Date: 2019-06-11T15:37:21Z
• Authors: Jin Huang; Dan Zhang; Lei Ding; Fanghui Zhang
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

AbstractA lead‐bismuth (Pb‐Bi) binary metal based all‐inorganic perovskite film is successfully fabricated and applied as absorber layer to enhance the stability of perovskite solar cells (PSCs). Unlike the Pb‐only perovskite‐based device, the Pb‐Bi binary metal perovskite based one shows better tolerance to humidity and oxygen. High power conversion efficiency (PCE) of 11.9% is obtained for the all‐inorganic (PSC). Noticeably, the PCE only reduced by 10% under atmospheric humidity of 40% in four weeks. An electron‐only device also shows reduced trap states. The improved stability and PCE is ascribed to higher quality perovskite film with less trap states and smaller series resistance (Rs) in the device.