Three-step sequential solution deposition of PbI2-free CH3NH3PbI3perovskite
Three-step sequential solution deposition of PbI2-free CH3NH3PbI3perovskite
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无 PbI2 CH3NH3PbI3 钙钛矿的三步连续溶液沉积
DOI：
10.1039/c4ta05384b
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发表时间：
2015
影响因子：
11.9
通讯作者：
Zhu Kai
中科院分区：
文献类型：
--
作者：
Zhao Yixin;Zhu Kai
我们展示了一个三步顺序的溶液过程中，制备PbI 2-自由CH 3 NH3 PbI 3钙钛矿薄膜。在该三步法中，首先在介孔TiO 2基底上沉积热不稳定的化学计量比PbI 2·CH 3 NH3 Cl前驱体膜，然后热分解形成PbI 2，最后通过室温下浸入CH 3 NH3 I的常规异丙醇溶液中转化为CH 3 NH3 PbI 3。与使用类似处理条件的两步法相比，三步法能够通过PbI 2·CH 3 NH3 Cl前体膜的热分解形成PbI 2膜。这有助于PbI 2快速转化为CH 3 NH3 PbI 3，而在最终转化步骤中没有任何可追踪的残余PbI 2，从而导致改善的器件性能。
We demonstrate a three-step sequential solution process to prepare PbI2-free CH3NH3PbI3 perovskite films. In this three-step method, a thermally unstable stoichiometric PbI2·CH3NH3Cl precursor film is first deposited on the mesoporous TiO2 substrate, followed by thermal decomposition to form PbI2, which is finally converted into CH3NH3PbI3 by dipping in a regular isopropanol solution of CH3NH3I at room temperature. In comparison to the two-step approach using similar processing conditions, the three-step method enables the formation of the PbI2 film through the thermal decomposition of the PbI2·CH3NH3Cl precursor film. This facilitates a rapid conversion of PbI2 to CH3NH3PbI3 without any traceable residue PbI2 in the final conversion step, leading to an improved device performance.