Boosting Efficiency and Stability of Perovskite Solar Cells with CdS Inserted at TiO2/Perovskite Interface. Issue 22 (20th October 2016)

• Record Type: Journal Article
• Authors: Ma, Yulong; Deng, Kaimo; Gu, Bangkai; Cao, Fengren; Lu, Hao; Zhang, Yuexing; Li, Liang
• Is Part Of: Advanced materials interfaces. Volume 3:Issue 22(2016)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2016-10-20
• Subjects: electron transport layer -- passivation -- perovskites -- solar cells -- stability; Materials science -- Periodicals; 620.11
• DOI: 10.1002/admi.201600729
• Languages: English
• ISSNs: 2196-7350

Abstract

Abstract : Organic–inorganic hybrid perovskite solar cells have undergone an unprecedented development as the next‐generation photovoltaic devices in recent years. The power conversion efficiency and stability are the key factors attracting great attentions from both academic and industrial communities. Here, a nonoxide CdS layer is inserted between TiO2 and perovskite to passivate the TiO2 interface in planar‐type perovskite solar cells. After introducing the CdS layer, significantly enhanced air stability and suppressed recombination between the trapped electrons and perovskite related to inverse transport are observed. At the optimum CdS thickness, a champion power conversion efficiency of 14.26% is achieved compared with 10.31% for the reference CdS‐free devices. This impressive efficiency also surpasses that of previously reported perovskite solar cells based on CdS. The largely improved performance is ascribed to the increased Fermi level of the electron transport layer, more efficient charge transport, and lower recombination rates. Abstract : Insertion of a CdS layer between TiO2 and perovskite passivates the defects at the TiO2 surface, extracts electrons from perovskite more efficiently, reducing recombination at the interface of TiO2 /perovskite, resulting in improved conversion efficiencies and air stability of perovskite solar cells.