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

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.

Key words

hole-transporting materials - porphyrin derivatives - perovskite solar cells - stability

Publication History

Received: 29 April 2022

Accepted after revision: 09 June 2022

Accepted Manuscript online:
10 June 2022

Article published online:
29 June 2022

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