Controlling Nucleation and Growth of Metal Halide Perovskite Thin Films for High-Efficiency Perovskite Solar Cells

作者：Sakai Nobuya; Wang Zhiping; Burlakov Victor M; Lim Jongchul; McMeekin David; Pathak Sandeep; Snaith Henry J

来源：Small, 2017, 13(14): 1602808.

DOI：10.1002/smll.201602808

Metal halide perovskite thin films can be crystallized via a broad range of solution-based routes. However, the quality of the final films is strongly dependent upon small changes in solution composition and processing parameters. Here, this study demonstrates that a fractional substitution of PbCl2 with PbI2 in the 3CH(3)NH(3)I: PbCl2 mixed-halide starting solution has a profound influence upon the ensuing thin-film crystallization. The presence of PbI2 in the precursor induces a uniform distribution of regular quadrilateral-shaped CH3NH3PbI3 perovskite crystals in as-cast films, which subsequently grow to form pinhole-free perovskite films with highly crystalline domains. With this new formulation of 3CH(3)NH(3)I: 0.98PbCl(2): 0.02PbI(2), this study achieves a 19.1% current-voltage measured power conversion efficiency and a 17.2% stabilized power output in regular planar heterojunction solar cells.

• 出版日期2017-4-11