Br-containing alkyl ammonium salt-enabled scalable fabrication of high-quality perovskite films for efficient and stable perovskite modules

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 7; no. 47; pp. 26849 - 26857
• Main Authors: Xu, Zhongyuan, Chen, Ruihao, Wu, Yazhuo, He, Ruiqin, Yin, Jun, Lin, Wei, Wu, Binghui, Li, Jing, Zheng, Nanfeng
• Format: Journal Article
• Language: English
• Published: Cambridge Royal Society of Chemistry 2019
• Subjects: Aging; Ammonium; Ammonium salts; Blade coating; Cations; Commercialization; Crystallization; Fabrication; Modules; Perovskites; Photovoltaic cells; Photovoltaics; Reliability; Stability; Synergistic effect
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c9ta09101g

The development of new processing techniques with high reliability in large-scale fabrication is considered to be the most critical issue concerning organic-inorganic halide perovskite photovoltaics for their potential commercialization in the next few years. Herein, the incorporation of a Br-containing tetrabutylammonium salt (TBAB) into the perovskite precursors demonstrated superior advantages in both crystallization and large-area uniformity control during the scalable blade-coating of perovskite films. By this facile approach, the significantly increased repeatability in device performance and efficient large-area 16 cm 2 -four-cell modules with best-efficiency of up to 15.79% were achieved. More importantly, the surficial modification with the alkylammonium cations enabled the long-term stability of the MAPbI 3 -based perovskite films and modules, resulting in the fabricated modules retaining >89% of the initial PCE after 1000 h of aging. This study presents a facile method for achieving the synergistic effects of crystallization tailoring, uniformity control and surface passivation based on the Br-containing molecular modification strategy for perovskite films, leading to the significantly improved efficiency, stability and fabrication reliability of PSC modules. The incorporation of a Br-containing tetrabutylammonium salt into perovskite precursors demonstrates superior advantages in both crystallization and large-area uniformity control during the scalable blade-coating of perovskite films.