Issue 7, 2023

A chlorinated polythiophene-based polymer as a dopant-free hole transport material in perovskite solar cells

Abstract

Despite the remarkable strides made in perovskite solar cell (PSC) research, the incorporation of doped hole transport materials (HTMs) presents a commercialization bottleneck. This study presents a chlorine-substituted polythiophene-based, dioxobenzodithiophene-containing conjugated polymer (P2T-Cl) as a promising dopant-free HTM. The highest occupied molecular orbital of P2T-Cl aligns well with PSCs, and flash-photolysis time-resolved microwave conductivity (TRMC) measurements reveal a high hole transfer yield of 0.99 for P2T-Cl compared to the non-chlorinated analogue of P2T (0.97) and non-doped polytriarylamine (PTAA) (0.79). Consequently, P2T-Cl exhibits a higher power conversion efficiency (PCE) without dopants (15.40%) compared to P2T (15.18%) and the standard polymer HTM PTAA (12.74%). This work presents a compelling example of a dopant-free polymer HTM with a simple structure for PSCs.

Graphical abstract: A chlorinated polythiophene-based polymer as a dopant-free hole transport material in perovskite solar cells

Supplementary files

Article information

Article type
Paper
Submitted
14 mar 2023
Accepted
24 máj 2023
First published
20 jún 2023
This article is Open Access
Creative Commons BY-NC license

Energy Adv., 2023,2, 1030-1035

A chlorinated polythiophene-based polymer as a dopant-free hole transport material in perovskite solar cells

K. Kranthiraja, R. Nishikubo and A. Saeki, Energy Adv., 2023, 2, 1030 DOI: 10.1039/D3YA00113J

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