Two-dimensional polythiophene homopolymer as promising hole transport material for high-performance perovskite solar cells

A polythiophene homopolymer with conjugated side chains (2D-PT) was applied as a hole transport material (HTM) of perovskite solar cells (PSCs). The all-conjugated two-dimensional structure effectively increases the ionization potential, realizing a high open-circuit voltage near 1 V for the 2D-PT-b...

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Bibliographic Details
Published in:Journal of power sources 2019-06, Vol.426 (C), p.55-60
Main Authors: Hsieh, Hsiao-Chi, Hsiow, Chuen-Yo, Su, Yu-An, Liu, Yu-Cheng, Chen, Wei, Chiu, Wen-Yen, Shih, Yen-Chen, Lin, King-Fu, Wang, Leeyih
Format: Article
Language:English
Subjects:
Conjugated polymers
Hole transport materials
MATERIALS SCIENCE
Perovskite solar cells
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Summary:A polythiophene homopolymer with conjugated side chains (2D-PT) was applied as a hole transport material (HTM) of perovskite solar cells (PSCs). The all-conjugated two-dimensional structure effectively increases the ionization potential, realizing a high open-circuit voltage near 1 V for the 2D-PT-based PSC. Very interestingly, the two-dimensional wide-angle X-ray scattering measurements show that the 2D-PT molecules are self-assembled into ordered structure with a face-on dominant orientation and exhibit a hole mobility, which is ∼1.6 times faster than that of poly(3-hexylthiophene) (P3HT). Consequently, the power conversion efficiency of PSC is noticeably increased by ∼30% as 2D-PT replaces P3HT as HTM. Moreover, the densely packed 2D-PT slows down the moisture induced degradation of perovskite crystals, leading to a better environmental stability. This work demonstrates that two-dimensional non-donor-acceptor structural conjugated polymers can be utilized as promising HTM of PSCs. [Display omitted] •2D comb-like polythiophenes exhibit good crystallinity and a face-on orientation.•2D polythiophene is a promising hole transport material of perovskite solar cells.•2D-PT-based perovskite solar cell achieves a high open-circuit voltage near 1 V.•The champion 2D-PT-cell exhibits an excellent PCE of 14.8%.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2019.04.008