化工进展 ›› 2018, Vol. 37 ›› Issue (09): 3528-3533.DOI: 10.16085/j.issn.1000-6613.2017-2164

• 材料科学与技术 • 上一篇    下一篇

制备方法对钙钛矿薄膜结构及形貌的影响

韦慧1,2, 汤洋1, 尤晖2   

  1. 1 北京市纳米结构薄膜太阳能电池工程技术研究中心, 北京低碳清洁能源研究所, 北京 102211;
    2 中国科学院合肥智能机械研究所, 安徽 合肥 230031
  • 收稿日期:2017-10-24 修回日期:2018-02-01 出版日期:2018-09-05 发布日期:2018-09-05
  • 通讯作者: 汤洋,工程师,研究方向为太阳能电池。
  • 作者简介:韦慧(1987-),女,博士研究生。
  • 基金资助:
    国家自然科学基金(61404007)和北京市优秀人才培养项目(2015000021223ZK38)。

Morphologies of CH3NH3PbI3 perovskite and performance of perovskite solar cells by using different fabrication process

WEI Hui1,2, TANG Yang1, YOU Hui2   

  1. 1 Beijing Engineering Research Center of Nano-Structured Thin Film Solar Cell, National Institute of Clean-and-Low-Carbon Energy, Beijing 102211, China;
    2 Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, Anhui, China
  • Received:2017-10-24 Revised:2018-02-01 Online:2018-09-05 Published:2018-09-05

摘要: 采用液相连续沉积法制备了有机/无机杂化钙钛矿(CH3NH3PbI3,MAPbI3)光吸收层,并研究了不同薄膜形貌、晶体结构和光吸收能力对钙钛矿太阳能电池性能的影响。结果表明:制备工艺对吸光层形貌和器件光电性能产生很大的影响。相对于分步浸渍法,分步旋涂法(分步旋涂无机相碘化铅PbI2和有机相甲胺碘CH3NH3I前驱液)和气体辅助修复法(新制初始MAPbI3薄膜在室温下置于甲胺气氛中)能有效改善薄膜形貌和平整度,获得覆盖完全的均匀钙钛矿吸光层。同时,进一步分析了初始MAPbI3膜的形貌对气体修复法制备全覆盖平整钙钛矿薄膜的影响,发现初始钙钛矿膜的形貌对最终修复后的膜层形貌没有影响,这可能是因为不同初始MAPbI3膜经甲胺气体处理后均形成一种"甲胺铅化碘-甲胺"(MAPbI3·MA)的液态中间相,再经退火处理后均获得平整、致密的钙钛矿膜层,极大地提高了MAPbI3的结晶度和薄膜均匀性,从而提高活性层的吸光率、光电流和电池效率。

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

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