Polymer-Passivated Inorganic Cesium Lead Mixed-Halide Perovskites for Stable and Efficient Solar Cells with High Open-Circuit Voltage over 1.3 V.

Zeng, Q and Zhang, X and Feng, X and Lu, S and Chen, Z and Yong, X and Redfern, S. A. T. and Wei, H and Wang, H and Shen, H and Zhang, W and Zheng, W and Zhang, H and Tse, JS and Yang, B (2018) Polymer-Passivated Inorganic Cesium Lead Mixed-Halide Perovskites for Stable and Efficient Solar Cells with High Open-Circuit Voltage over 1.3 V. Advanced Materials. ISSN 0935-9648 1521-4095 DOI https://doi.org/10.1002/adma.201705393

[img] Text
Zeng_et_al-2018-Advanced_Materials.pdf - Published Version
Restricted to Registered users only

Download (2MB) | Request a copy
Official URL: https://www.ncbi.nlm.nih.gov/pubmed/29333763

Abstract

Cesium-based trihalide perovskites have been demonstrated as promising light absorbers for photovoltaic applications due to their superb composition stability. However, the large energy losses (Eloss ) observed in inorganic perovskite solar cells has become a major hindrance impairing the ultimate efficiency. Here, an effective and reproducible method of modifying the interface between a CsPbI2 Br absorber and polythiophene hole-acceptor to minimize the Eloss is reported. It is demonstrated that polythiophene, deposited on the top of CsPbI2 Br, can significantly reduce electron-hole recombination within the perovskite, which is due to the electronic passivation of surface defect states. In addition, the interfacial properties are improved by a simple annealing process, leading to significantly reduced energy disorder in polythiophene and enhanced hole-injection into the hole-acceptor. Consequently, one of the highest power conversion efficiency (PCE) of 12.02% from a reverse scan in inorganic mixed-halide perovskite solar cells is obtained. Modifying the perovskite films with annealing polythiophene enables an open-circuit voltage (VOC ) of up to 1.32 V and Eloss of down to 0.5 eV, which both are the optimal values reported among cesium-lead mixed-halide perovskite solar cells to date. This method provides a new route to further improve the efficiency of perovskite solar cells by minimizing the Eloss .

Item Type: Article
Uncontrolled Keywords: 2017AREP; IA73
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Advanced Materials
Identification Number: https://doi.org/10.1002/adma.201705393
Depositing User: Sarah Humbert
Date Deposited: 09 Feb 2018 13:51
Last Modified: 09 Feb 2018 13:51
URI: http://eprints.esc.cam.ac.uk/id/eprint/4090

Actions (login required)

View Item View Item

About cookies