Fluorene-Modified Zinc Porphyrin as Low-Cost Hole-Transporting Material for Efficient Perovskite Solar Cells

• Published in: Organic Materials Vol. 4; no. 2; pp. 28 - 35
• Main Authors: Wang, Yu-Duan, Shao, Jiang-Yang, Lan, Zhong-Rui, Zhong, Yu-Wu
• Format: Journal Article
• Language: English
• Published: Rüdigerstraße 14, 70469 Stuttgart, Germany Georg Thieme Verlag KG 01.06.2022; Georg Thieme Verlag
• Subjects: hole-transporting materials; Organic Materials in Electronics; perovskite solar cells; porphyrin derivatives; stability; hole-transporting materials; perovskite solar cells; stability; porphyrin derivatives
• ISSN: 2625-1825; 2625-1825
• DOI: 10.1055/a-1873-5360

Abstract The potential of porphyrin derivatives as hole-transporting materials (HTMs) for perovskite solar cells (PSCs) has been demonstrated. The structural engineering of porphyrin HTMs provides an important means for further improvement of the performance of PSCs. Herein, a zinc-porphyrin derivative (ZnP-FL) decorated with four fluorene-terminated triarylamines is presented. The lab synthesis cost of ZnP-FL is estimated to be around $32.2/g. It exhibits good charge-transport ability and thermal stability. A high power conversion efficiency (PCE) of 19.31% is achieved by using ZnP-FL HTM ( V oc  = 1.08 V; J sc  = 24.08 mA · cm −2 ), which is distinctly higher than that of a control HTM without the fluorene groups (PCE = 17.75%; V oc  = 0.97 V; J sc  = 24.04 mA · cm −2 ). This performance enhancement is mainly attributed to the improved open-circuit voltage, which benefits from the stabilized HOMO level of ZnP-FL. In addition, the porphyrin HTM-based PSCs show superior air and thermal stability to the device with the standard HTM spiro-OMeTAD. These results demonstrate that the low-cost and easily accessible porphyrin derivatives are promising HTMs for efficient and stable PSCs.