Targeted Management of Perovskite Film by Co(II) Sulfophenyl Porphyrin for Efficient and Stable Solar Cells

• Published in: Chinese journal of chemistry Vol. 41; no. 1; pp. 43 - 49
• Main Authors: Feng, Xiao‐Xia, Lv, Xudong, Cao, Jing, Tang, Yu
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY‐VCH Verlag GmbH & Co. KGaA 01.01.2023; Wiley Subscription Services, Inc
• Subjects: Carbon dioxide; Chemical reactions; Co(II) sulfophenyl porphyrin; Cobalt; Cooperative effect; Defects; Efficiency; Fabrication; Ions; Lead; Lead compounds; Metal halides; Organic‐inorganic hybrid composites; Perovskite solar cells; Perovskites; Photovoltaic cells; Porphyrins; Redox chemistry; Redox reactions; Solar cells; Stability; Sulfonic acid
• ISSN: 1001-604X; 1614-7065
• DOI: 10.1002/cjoc.202200468

Comprehensive Summary In the lead halide perovskite solar cells (PSCs), the redox reaction of I– and Pb2+ ions in perovskite materials under the fabrication and operation processes causes the formation of defects to destroy the cell efficiency and long‐term stability. Herein, we have employed a Co(II) sulfophenyl porphyrin (CoTPPS) to modify the perovskite film. The sulfonic group could coordinate with Pb2+ to efficiently passivate the uncoordinated Pb2+. Additionally, Co2+ ions in CoTPPS could react with I2 generated under the thermal and light stress to yield the Co3+ and I–, thus achieving the regeneration of I– in perovskite film. Therefore, the CoTPPS could realize the targeted management of the imperfections in perovskite film. As a result, the modified PSCs reveal the remarkably enhanced cell performance. More importantly, the CoTPPS modified device retains 75% of its initial efficiency value storing at 85°C for 2000 h and about 70% of its efficiency when being continuously illuminated at a simulated sunlight for 1200 h. This strategy tackles the chemical reaction and inhibits the defect generation, thus improving the operational stability and efficiency of PSCs. Co(II) sulfophenyl porphyrin was employed for targeted management of irreversible reaction and control of defects in perovskite films simultaneously, enhancing the efficiency and stability of corresponding PSCs.