Ultraviolet-light induced H+ doping in polymer hole transport material for highly efficient perovskite solar cells. (December 2022)

• Record Type: Journal Article
• Authors: Zhang, Haijuan; Hui, Wei; Wang, Ze; Li, Mingqi; Xi, Haolan; Zheng, Yonghao; Liu, Xiaodong
• Is Part Of: Materials today energy. Volume 30(2022)
• Publication Date: 2022-12
• Subjects: Perovskite solar cells -- Polymer hole transport material -- H+ dopants -- Ultraviolet-light inducement; Energy development -- Periodicals; Energy industries -- Periodicals; Power resources -- Periodicals; Energy policy -- Periodicals; Energy development; Energy industries; Energy policy; Power resources; Electronic journals; Periodicals; 621.042
• DOI: 10.1016/j.mtener.2022.101159
• Languages: English
• ISSNs: 2468-6069

Abstract

Abstract: Poly(N, N′-bis(4-butylphenyl)-N, N′-bis(phenyl)benzidine) (PTPD) is an appropriate hole transporting material (HTM) in perovskite solar cells (PSCs) due to its simple fabrication process. However, the relatively low conductivity of PTPD compared with traditional inorganic HTMs limits its application in highly efficient PSCs. Here, we employ an ultraviolet (UV)-light induced H + doping strategy to improve the conductivity of PTPD hole transporting layer (HTL) for high-performance n-i-p planar structure PSCs. The released proton (H + ) from 4-isopropyl-4′-methyldiphenyliodonium tetrakis-(pentafluorophenyl-borate) (DPI-TPFB) induced by UV-light irradiation can coordinate with PTPD to form PTPD-NH +, which dramatically enhances the hole carrier transport and extraction. As a result, a champion power conversion efficiency (PCE) of 21.38% is achieved in PSCs with H + doped PTPD as HTL, which is much higher than that (17.63%) of the PSCs with pristine PTPD HTL. Furthermore, the stability of the PSCs in humid air is significantly improved after adopting H + doped PTPD to replace pristine PTPD, owing to the increased hydrophobicity of PTPD HTL. Graphical abstract: Image 1 Highlights: A UV-induced H + doping strategy is developed to improve the conductivity of PTPD. The conductivity and hole extraction efficiency are extremely improved. A champion PCE of 21.38% is achieved by this doping strategy.