Heo Do Yeon, Luo Zhengtang, Kim Soo Young
School of Chemical Engineering and Materials Science, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
Department of Chemical and Biomolecular Engineering, the University of Hong Kong Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Materials (Basel). 2018 Aug 13;11(8):1417. doi: 10.3390/ma11081417.
CH₃NH₃PbICl species were fabricated as light-absorbing layers for perovskite solar cells (PSCs), by employing NH₄I, NH₄Br, and NH₄Cl as additives via annealing at 100 °C for different times. Solutions containing CH₃NH₃I, PbI₂, and PbCl₂ (4:1:1 molar ratio) in ,-dimethylformamide were used to prepare perovskites with NH₄I, NH₄Br, and NH₄Cl as additives, at concentrations of 0.1 M and 0.3 M. The additives helped increase the grain size and reduce pinholes in the perovskite films, as confirmed by field-emission scanning electron microscopy. The X-ray diffraction profiles of CH₃NH₃PbICl clearly showed peaks at 14° and 28° for the samples with additives, indicative of crystallinity. The best PSC performance with a power conversion efficiency of 9.13%, was achieved using 0.1 M NH₄I by annealing for 5 min, whereas the power conversion efficiency of the perovskite solar cells without additives was 5.40%.
通过使用碘化铵、溴化铵和氯化铵作为添加剂，在100℃下退火不同时间，制备了CH₃NH₃PbICl物种作为钙钛矿太阳能电池（PSC）的光吸收层。含有碘化甲铵、碘化铅和氯化铅（摩尔比4:1:1）的溶液在N，N-二甲基甲酰胺中用于制备以碘化铵、溴化铵和氯化铵为添加剂的钙钛矿，浓度分别为0.1M和0.3M。场发射扫描电子显微镜证实，添加剂有助于增加钙钛矿薄膜的晶粒尺寸并减少针孔。对于添加了添加剂的样品，CH₃NH₃PbICl的X射线衍射图谱在14°和28°处清晰显示出峰，表明具有结晶性。通过在5分钟内退火使用0.1M碘化铵，实现了最佳的PSC性能，功率转换效率为9.13%，而没有添加剂的钙钛矿太阳能电池的功率转换效率为5.40%。
