Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance
Modulating Crystallization in Semitransparent Perovskite Films Using Submicrometer Spongelike Polymer Colloid Particles to Improve Solar Cell Performance
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DOI：
10.1021/acsaem.9b01162
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发表时间：
2019-09
影响因子：
6.4
通讯作者：
Chotiros Dokkhan;M. Mokhtar;Chun-Ren Ke;A. Walton;Qian Chen;N. Hodson;Qing Lian;B. Saunders
中科院分区：
文献类型：
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作者：
Chotiros Dokkhan;M. Mokhtar;Chun-Ren Ke;A. Walton;Qian Chen;N. Hodson;Qing Lian;B. Saunders
半透明钙钛矿太阳能电池（PSCs）在太阳能窗口应用方面具有良好的潜力。然而，实现钙钛矿薄膜的均匀覆盖是一个主要的挑战。不幸的是，不受控制的针孔形成是这种薄膜阻碍显影的常见问题，特别是对于大面积器件。在本研究中，我们使用非常小（亚微米）的可膨胀聚合物胶体颗粒（微凝胶）作为添加剂，制备了均匀的CH3NH3PbI3 （MAPI）钙钛矿薄膜。微凝胶（mg）是良好的成膜剂，促进了半透明（ST）钙钛矿薄膜的形成，提高了薄膜的覆盖率。mg作为胶体海绵，延缓钙钛矿前体的释放，从而延缓钙钛矿的结晶。与不含mg的对照膜相比，使用mg制备的ST膜针孔较少。x射线光电子能谱显示了mg与Pb配位的证据，表明它们钝化了MAPI。值得注意的是，本研究中使用的亚微米mg…
Semitransparent perovskite solar cells (PSCs) have excellent potential for solar window applications. A major challenge exists, however, in achieving uniform coverage for thin perovskite films. Unfortunately, uncontrolled pinhole formation is a common problem for such films that obstructs development, especially for large area devices. In this study, we used very small (submicrometer) swellable polymer colloid particles (microgels) as additives to prepare uniform thin CH3NH3PbI3 (MAPI) perovskite films. Microgels (MGs) are good film-formers and promoted formation of semitransparent (ST) perovskite films with improved coverage. The MGs act as colloidal sponges and delayed release of perovskite precursors, thereby delaying perovskite crystallization. The ST films prepared using MGs had fewer pinholes compared to the MG-free control films. X-ray photoelectron spectroscopy showed evidence of Pb coordination by the MGs and they were shown to passivate MAPI. Remarkably, the submicrometer MGs used in this study ...