Controllable Two-dimensional Perovskite Crystallization via Water Additive for High-performance Solar Cells

Ziji Liu; Hualin Zheng; Detao Liu; Zhiqing Liang; Wenyao Yang; Hao Chen; Long Ji; Shihao Yuan; Yiding Gu; Shibin Li

doi:10.1186/s11671-020-03338-5

Controllable Two-dimensional Perovskite Crystallization via Water Additive for High-performance Solar Cells

Nanoscale Res Lett. 2020 May 13;15(1):108. doi: 10.1186/s11671-020-03338-5.

Authors

Ziji Liu¹, Hualin Zheng¹, Detao Liu¹, Zhiqing Liang², Wenyao Yang³, Hao Chen¹, Long Ji¹, Shihao Yuan¹, Yiding Gu¹, Shibin Li⁴

Affiliations

¹ State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, Sichuan, China.
² State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, Sichuan, China. liangzq@uestc.edu.cn.
³ Chongqing Engineering Research Center of New Energy Storage Devices and Applications, Chongqing University of Arts and Sciences, Chongqing, 402160, People's Republic of China.
⁴ State Key Laboratory of Electronic Thin Films and Integrated Devices, and School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, 610054, Sichuan, China. shibinli@uestc.edu.cn.

Abstract

Steering the crystallization of two-dimensional (2D) perovskite film is an important strategy to improve the power conversion efficiency (PCE) of 2D perovskite solar cells (PVSCs). In this paper, the deionized water (H₂O) additive is introduced into the perovskite precursor solution to prepare high-quality 2D perovskite films. The 2D perovskite film treated with 3% H₂O shows a good surface morphology, increased crystal size, enhanced crystallinity, preferred orientation, and low defect density. The fabricated 2D PVSC with 3% H₂O exhibits a higher PCE compared with that without H₂O (12.15% vs 2.29%). Furthermore, the shelf stability of unsealed devices with 3% H₂O under ambient environment is significantly improved. This work provides a simple method to prepare high-quality 2D perovskite films for efficient and stable 2D PVSCs.

Keywords: Additive; Crystallization; Solar cell; Two-dimensional perovskite; Water.

Abstract

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