Double Layer Composite Electrode Strategy for Efficient Perovskite Solar Cells with Excellent Reverse-Bias Stability

Chaofan Jiang; Junjie Zhou; Hang Li; Liguo Tan; Minghao Li; Wolfgang Tress; Liming Ding; Michael Grätzel; Chenyi Yi

doi:10.1007/s40820-022-00985-4

Double Layer Composite Electrode Strategy for Efficient Perovskite Solar Cells with Excellent Reverse-Bias Stability

Nanomicro Lett. 2022 Dec 13;15(1):12. doi: 10.1007/s40820-022-00985-4.

Authors

Chaofan Jiang¹, Junjie Zhou¹, Hang Li¹, Liguo Tan¹, Minghao Li¹, Wolfgang Tress², Liming Ding³, Michael Grätzel⁴, Chenyi Yi⁵

Affiliations

¹ State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.
² Institute of Computational Physics (ICP), ZHAW School of Engineering, Wildbachstr. 21, 8400, Winterthur, Switzerland.
³ Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, People's Republic of China.
⁴ Laboratory of Photonics and Interfaces, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology Lausanne, 1015, Lausanne, Switzerland.
⁵ State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, People's Republic of China. yicy@mail.tsinghua.edu.cn.

Abstract

Perovskite solar cells (PSCs) have become the representatives of next generation of photovoltaics; nevertheless, their stability is insufficient for large scale deployment, particularly the reverse bias stability. Here, we propose a transparent conducting oxide (TCO) and low-cost metal composite electrode to improve the stability of PSCs without sacrificing the efficiency. The TCO can block ion migrations and chemical reactions between the metal and perovskite, while the metal greatly enhances the conductivity of the composite electrode. As a result, composite electrode-PSCs achieved a power conversion efficiency (PCE) of 23.7% (certified 23.2%) and exhibited excellent stability, maintaining 95% of the initial PCE when applying a reverse bias of 4.0 V for 60 s and over 92% of the initial PCE after 1000 h continuous light soaking. This composite electrode strategy can be extended to different combinations of TCOs and metals. It opens a new avenue for improving the stability of PSCs.

Keywords: Characterization; Composite electrode; Perovskite solar cells; Reverse bias; Stability.