Dopant-Free Hole-Transporting Material with Enhanced Intermolecular Interaction for Efficient and Stable n-i-p Perovskite Solar Cells

Wang J, Wu X, Liu Y, Qin T, Zhang K, Li N, Zhao J, Ye R, Fan Z, Chi Z, Zhu Z (2021)

Publication Type: Journal article

Publication year: 2021

Journal

Advanced Energy Materials Wiley

DOI: 10.1002/aenm.202100967

Abstract

Developing low-cost, efficient, and stable dopant-free hole-transporting materials (HTMs) in perovskite solar cells (PVSCs) is essential to their commercial deployment. Herein, the synthesis of a novel spirofluorene-dithiolane based small molecular HTM, SFDT-TDM, through facile and low-cost synthetic routes is reported. The C-H…π interactions in adjacent SFDT-TDM are beneficial for high hole mobility and the methylthio groups in SFDT-TDM can serve as Lewis bases to passivate the defects on the surface of perovskite films, leading to suppressed non-radiative recombination and enhanced charge extraction at the perovskite/HTM interface. As a result, CsxFA1−xPbI3 based PVSCs with SFDT-TDM as the HTM realize champion power conversion efficiencies (PCEs) of 21.7% and 20.3% for small-area (0.04 cm2) and large-area (1.0 cm2) devices with negligible photocurrent hysteresis, respectively. Additionally, all-inorganic CsPbI3−xBrx based PVSCs with SFDT-TDM demonstrate an impressive PCE of 17.1% along with excellent stability. This work highlights the great potential of the spirofluorene core for exploring low-cost and dopant-free HTMs for PVSCs with high efficiency and stability.

Authors with CRIS profile

Kaicheng Zhang Institute Materials for Electronics and Energy Technology (i-MEET) Ning Li Institute Materials for Electronics and Energy Technology (i-MEET)

Involved external institutions

City University of Hong Kong (CityU) CN China (CN) Sun Yat-Sen University CN China (CN)

How to cite

APA:

Wang, J., Wu, X., Liu, Y., Qin, T., Zhang, K., Li, N.,... Zhu, Z. (2021). Dopant-Free Hole-Transporting Material with Enhanced Intermolecular Interaction for Efficient and Stable n-i-p Perovskite Solar Cells. Advanced Energy Materials. https://doi.org/10.1002/aenm.202100967

MLA:

Wang, Jing, et al. "Dopant-Free Hole-Transporting Material with Enhanced Intermolecular Interaction for Efficient and Stable n-i-p Perovskite Solar Cells." Advanced Energy Materials (2021).

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