Low-temperature ZnOx (ALD)/SiO2 (spin-coating) dopant-free electron-selective contact enabling 22.11%-efficiency Si solar cell

IF 6.3 2区材料科学 Q2 ENERGY & FUELS Solar Energy Materials and Solar Cells Pub Date : 2025-01-08 DOI:10.1016/j.solmat.2025.113403

Jiawang Qiu , Ying Zhang , Zhongguo Zhou , Xi Lin , Xiaomin Song , Sihua Zhong , Haipeng Yin , Xiulin Jiang , Junbing Zhang , Zi Ouyang , Wenzhong Shen , Zengguang Huang

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Abstract

In recent years, there has been a concerted effort to develop new electron-selective (ES) materials for crystalline silicon (c-Si) solar cells aimed at simplifying the processes and improving efficiencies. By combing the low-temperature spin-coating SiO₂ with the atomic layer deposition (ALD) ZnO_x, we in this work prepared the dopant-free ES contact of ALD-ZnO_x/Spin-coating SiO₂/LiF/Al and applied it to n-type c-Si solar cells as a full-area rear contact. It is found that the optimal ZnO_x/SiO₂/LiF/Al sample with the 10 cycles-thickness ZnO_x, has the lowest contact resistivity (ρ_c) of 0.857 mΩ cm² and the high minority carrier lifetime (τ_eff) of 319.43 μs, indicating the simultaneous achievement of the excellent contact performance and surface passivation. It is verified that the spin-coating SiO₂ layer can boost the surface passivation level while maintaining the low ρ_c due to the pinhole-like carrier transport mechanism in spin-coating SiO₂. Finally, the champion efficiency of 22.11 % was achieved in the n-type c-Si solar cell with full-area rear ZnO_x/SiO₂/LiF/Al ES dopant-free contact. This represents the best performance for ZnO_x-based dopant-free c-Si solar cells, displaying a bright prospect of this ES contact in the low-temperature and high-efficiency Si heterojunction and Si/Perovskite tandem solar cells.

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来源期刊

Solar Energy Materials and Solar Cells 工程技术-材料科学：综合

CiteScore

12.60

自引率

11.60%

发文量

513

审稿时长

47 days

期刊介绍： Solar Energy Materials & Solar Cells is intended as a vehicle for the dissemination of research results on materials science and technology related to photovoltaic, photothermal and photoelectrochemical solar energy conversion. Materials science is taken in the broadest possible sense and encompasses physics, chemistry, optics, materials fabrication and analysis for all types of materials.