Thermal Behaviors of Methylammonium Lead Trihalide Perovskites with or without Chlorine Doping

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• 作者：Fangfang Wang ; Xiaoning Li ; Xiaofeng Yin ; Zhengping Fu ; Yalin Lu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：July 21, 2016
• 年：2016
• 卷：120
• 期：28
• 页码：15009-15016
• 全文大小：587K
• 年卷期：0
• ISSN：1932-7455

文摘

Methylammonium lead trihalide perovskites have become the harbinger in solar cells lately. However, many fundamental mechanisms, especially those related to the used materials, still need a deeper understanding, in order to further improve the cells’ stability and efficiency. This work discussed the influence of chlorine doping on the materials’ thermal stability and the energy loss by either releasing heat or emitting light in CH₃NH₃PbI₃. The results indicated that CH₃NH₃PbI_3–xCl_x had no phase transition in the range 25–100 °C, in contrast to CH₃NH₃PbI₃ with a phase transition at ∼50 °C. It was discovered that the heat generated in absorbing photon processes in CH₃NH₃PbI_3–xCl_x could be reduced, about 20% lower than that in CH₃NH₃PbI₃. More heat released in CH₃NH₃PbI₃ may cause the occurrence of the phase transition and then further decline the cell stability. Photoluminescence results also indicated that adding chlorine into CH₃NH₃PbI₃ could further suppress the energy loss in the means emitting light.