关键词: 沉积法, 钙钛矿, 微观形貌, 光电流

Abstract: We studied the influence of surface morphology, crystal structure and optical absorption of the perovskite (CH₃ NH₃ PbI₃, MAPbI₃) films on the performance of the organic-inorganic hybrid perovskite solar cells which prepared by various sequential deposition technology. It is shown that deposition conditions have significant impacts on the morphologies of the MAPbI₃ adsorbent layers as well as the performance of the solar cells. Compared with the sequential MAI-soaking method, other deposition methods can effectively improve the morphology by increasing the flatness and full surface coverage. Meanwhile, the mechanism involved in the preparation of smooth, full-coverage MAPbI₃ films using the post-treatment method at room temperature (RT) was studied further. The results demonstrate that the resulting smooth MAPbI₃ thin films are virtually independent on the morphology of the raw perovskite films using various deposition methods, due to the formation and spreading of an intermediate MAPbI₃·MA liquid phase. These processes improved the morphology and crystallization of perovskite resulting in a significant enhancement in light absorption, photocurrent and the performance of solar cell devices.

Key words: deposition method, perovskite, morphology, photocurrent