Sn‐Doped Nb2O5 Films as Effective Hole‐Selective Passivating Contacts for Crystalline Silicon Solar Cells

Author:

Yu Guoqiang1,Liu Can1,Wang Tao1,Wei Yaju1,Liu Wuqi1,Fu Wang1,Wu Xiaoping1,Lin Ping1,Xu Lingbo1,Cui Can1,Yu Xuegong2,Wang Peng1ORCID

Affiliation:

1. Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of Physics Zhejiang Sci‐Tech University Hangzhou 310018 China

2. State Key Laboratory of Silicon and Advanced Semiconductor Materials & School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China

Abstract

Carrier‐selective contacts (CSCs) in crystalline silicon (c‐Si) solar cells have attracted great attention due to suppressing contact region recombination and achieving higher conversion efficiency. Among transition metal oxides for CSCs, niobium oxide (Nb2O5) is considered as an attractive candidate for electron‐selective contact due to its excellent passivation properties and small conduction band offsets with c‐Si. Nevertheless, the performance of c‐Si solar cells employing Nb2O5 contact layer has not been explored yet. Herein, the carrier selectivity of solution‐processed Nb2O5 films is investigated for c‐Si. Interestingly, Nb2O5 exhibits high electron‐blocking performance and low contact resistivities with p‐Si. The ultra‐thin SiOx interlayer formed by UV–O3 pretreatment further reduces the contact resistivities and increases minority carrier lifetime due to the improved contact interface. The Sn4+ doping improves the work function of Nb2O5 to induce larger upward band bending at c‐Si surface, thus enhancing the hole selectivity. As a result, p‐type c‐Si solar cells with solution‐processed Nb2O5 hole‐selective contact layer have achieved the highest power conversion efficiency of 18.4%, with a high‐thermal stability superior to the typical hole transport layers. This work first demonstrates the exceptional hole selectivity of Nb2O5, which shows very promising applications in high‐efficiency c‐Si solar cells.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

Publisher

Wiley

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