4.7 Article

Two birds with one stone: dopant-free squaraine hole-transporting material for perovskite solar cell

Journal

MATERIALS TODAY ENERGY
Volume 37, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2023.101411

Keywords

High hole mobility; Organic; Solar energy materials; Passivation

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This paper presents the development of a resonance-structured squaraine HTM D12, which not only exhibits high hole extraction and mobility, but also passivates perovskite defects, leading to improved efficiency and stability of solar cells.
Developing alternative dopant-free hole-transporting materials (HTM) with a passivation effect and high hole mobility is significant for enhancing the power conversion efficiency (PCE) and stability of the perovskite solar cells (PSCs) with a simplified process. In this work, we report a squaraine HTM 3,4bis(4'-(bis(4-methoxyphenyl)amino)-[1,1'-biphenyl]-4-yl)cyclobut-3-ene-1,2-dione (D12) with a resonance central structure shuttling between electrically neutral dione and charge-separated inner salts. The donor-acceptor-donor type molecule D12 exhibits an extremely strong capacity not only for hole exaction and mobility, but also for the passivation of perovskite defects. This results in a high PCE of 22.32% for D12-based PSCs. After 30 days of aging at a high relative humidity of 65% at 30 degrees C, it remains 90% of its initial PCE. This work offers a strategy of designing dopant-free small-molecule HTM and enhancing the stability and PCE of PSCs.

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