Solvent and Intermediate Phase as Boosters for the Perovskite Transformation and Solar Cell Performance.
Solvent and Intermediate Phase as Boosters for the Perovskite Transformation and Solar Cell Performance.
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DOI：
10.1038/srep25648
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发表时间：
2016-05-09
影响因子：
4.6
通讯作者：
Park B
中科院分区：
文献类型：
--
作者：
Kim J;Hwang T;Lee S;Lee B;Kim J;Jang GS;Nam S;Park B
高功率转换效率和器件稳定性是CH 3 NH3 PbI 3（MAPbI 3）钙钛矿太阳能电池商业化的两个主要挑战。在此，我们展示了一种使用MAI/乙醇浸渍的扩散工程钙钛矿合成方法，并将其与MAI/异丙醇的常规合成方法进行了比较。MAI/C_2H_5OH在PbCl_2膜中的扩散比MAI/C_3H_7OH更有利。从乙醇和高度结晶的MAPbI 3进行的钙钛矿转化，杂质最少，效率从5.86%提高到9.51%。此外，我们进一步确定了中间体，从而PbCl 2转化为MAPbI 3的反应机理。通过简单的工程设计来增强钙钛矿的表面形态以及结晶度，具有甚至更快的转换，除了在环境条件下30天后的上级稳定性之外，还获得了11.23%的初始功率转换效率。
High power conversion efficiency and device stabilization are two major challenges for CH3NH3PbI3 (MAPbI3) perovskite solar cells to be commercialized. Herein, we demonstrate a diffusion-engineered perovskite synthesis method using MAI/ethanol dipping, and compared it to the conventional synthesis method from MAI/iso-propanol. Diffusion of MAI/C2H5OH into the PbCl2 film was observed to be more favorable than that of MAI/C3H7OH. Facile perovskite conversion from ethanol and highly-crystalline MAPbI3 with minimized impurities boosted the efficiency from 5.86% to 9.51%. Additionally, we further identified the intermediates and thereby the reaction mechanisms of PbCl2 converting into MAPbI3. Through straightforward engineering to enhance the surface morphology as well as the crystallinity of the perovskite with even faster conversion, an initial power conversion efficiency of 11.23% was obtained, in addition to superior stability after 30 days under an ambient condition.