Controllable Perovskite Crystallization by Water Additive for High‐Performance Solar Cells. (1st October 2015)

• Record Type: Journal Article
• Authors: Gong, Xiu; Li, Meng; Shi, Xiao‐Bo; Ma, Heng; Wang, Zhao‐Kui; Liao, Liang‐Sheng
• Is Part Of: Advanced functional materials. Volume 25:Number 42(2015)
• Page Start: 6671
• Page End: 6678
• Publication Date: 2015-10-01
• Subjects: perovskite crystallization -- perovskite solar cells -- stability -- water additives; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201503559
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract : A key issue for perovskite solar cells is the stability of perovskite materials due to moisture effects under ambient conditions, although their efficiency is improved constantly. Herein, an improved CH3 NH3 PbI3− x Cl x perovskite quality is demonstrated with good crystallization and stability by using water as an additive during crystal perovskite growth. Incorporating suitable water additives in N, N ‐dimethylformamide (DMF) leads to controllable growth of perovskites due to the lower boiling point and the higher vapor pressure of water compared with DMF. In addition, CH3 NH3 PbI3− x Cl x · n H2 O hydrated perovskites, which can be resistant to the corrosion by water molecules to some extent, are assumed to be generated during the annealing process. Accordingly, water additive based perovskite solar cells present a high power conversion efficiency of 16.06% and improved cell stability under ambient conditions compared with the references. The findings in this work provide a route to control the growth of crystal perovskites and a clue to improve the stability of organic–inorganic halide perovskites. Abstract : Water additive is incorporated into the perovskite precursor solution to control the oriented growth of crystal perovskites and improve the stability of perovskite solar cells. As a result, a power conversion efficiency of 16.06% and an improved cell stability under ambient conditions are achieved.