A Dual-Functional Conjugated Polymer as an Efficient Hole-Transporting Layer for High-Performance Inverted Perovskite Solar Cells
ACS Applied Materials & Interfaces
(
IF
8.2
)
Pub Date : 2021-04-05
, DOI:
10.1021/acsami.1c00729
Qiaogan Liao
1,
2
,
Yang Wang
3
,
Xiyu Yao
1,
2
,
Mengyao Su
2
,
Bolin Li
2
,
Huiliang Sun
2
,
Jiachen Huang
2
,
Xugang Guo
2
Affiliation
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), No. 1088, Xueyuan Road, Shenzhen 518055, Guangdong, China.
College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen 361005, Fujian China.
Conductive polyelectrolytes such as P3CT-Na have been widely used as efficient hole-transporting layers (HTLs) in inverted perovskite solar cells (PSCs) due to their high hole mobility. However, the acid–base neutralization reaction is indispensable for preparing such polyelectrolytes and the varied content of cations usually leads to poor reproducibility of the device performance in PSCs. In this work, a commercially available polymer poly[3-(4-carboxybutyl)thiophene-2,5-diyl] (P3CT) was directly applied as an HTL in PSCs for the first time. Encouragingly, it was found that due to the dual functionality of carboxyl groups on side chains, a thin layer of P3CT can not only strongly anchor on ITO electrode and optimize its work function but also show an effective passivation effect toward perovskite active layer. Benefiting from such dual functionality, a uniform perovskite film with better quality was obtained on P3CT. As a result, the P3CT-based PSCs show much lower nonradiative recombination and achieve a champion power conversion efficiency (PCE) of 21.33% with a high fill factor (FF) of 83.6%. Impressively, as the device area is increased to 0.80 cm2, a PCE of 19.65% can still be obtained for the PSCs based on P3CT HTL. Our work provides important strategy for developing HTLs for high-performance PSCs.
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