In Situ Graded Passivation via Porphyrin Derivative with Enhanced Photovoltage and Fill Factor in Perovskite Solar Cells

• DOI: 10.1002/solr.202100964
• Publication Date: 2021-12-11T12:41:47Z
• Authors: Kuo Su; Wentao Chen; Yuqiong Huang; Guang Yang; Keith Gregory Brooks; Bao Zhang; Yaqing Feng; Mohammad Khaja Na...; Yi Zhang
• Keywords: Passivation; Carrier lifetime

While perovskite solar cells (PSCs) have recently experienced a rapid rise in power conversion efficiency (PCE), the prevailing PSCs still contain nondesirable defects interior and interface of layer, which limits further enhancement PCE device stability. Herein, new D– π –A‐type zinc pyridine porphyrin derivative (ZnPP) is synthesized used as passivation molecular via antisolvent process for modifying typical bulk thin film, leading to type PSC with graded layer. Impressively, it found that ZnPP treatment significantly improves quality films reduces charge transport losses through passivating uncoordinated Pb 2+ cations, yielding devices high 21.08% fill factor (FF) 82.91% demonstrating promise integration tailor modification.