Lead iodide as a buffer layer in UV-induced degradation of CH_3NH_3PbI_3 films

Melvin Ambrose A.; Stoichkov Vasil Dimitrov; Kettle Jeff; Mogilyansky Dmitri; Katz Eugene A.; Visoly-Fisher Iris

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Lead iodide as a buffer layer in UV-induced degradation of CH_3NH_3PbI_3 films

机译：碘化铅作为缓冲层在UV诱导的CH_3NH_3PbI_3薄膜降解中

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Encapsulated CH3NH3PbI3 films, the 'work horse' of the organic inorganic perovskite-based photovoltaics, grown by one step- and two step-deposition methods, were used to study the effect of the film preparation method on their photostability. Time dependent light absorption decay under exposure to concentrated sunlight was used to estimate the degradation of the films. Films deposited by one step showed a significant decrease in the CH3NH3PbI3 absorbance when illuminated through the substrate, while films obtained through two step deposition exhibited almost no photodegradation under similar sunlight exposure. On the other hand, both types of films degraded significantly when irradiated through the top encapsulation. Unreacted PbI2 present near the substrate is suggested to be responsible for enhancing the photostability of the films obtained by two step deposition. Here, remnant PbI2 works as a UV filter and reduces UV light-induced degradation. The results demonstrate the significance of the preparation method in determining photochemical stability of the perovskite films, due to favorable property of remnant PbI2 in the absorber as a UV-protective layer.

机译：封装的CH3NH3PbI3薄膜是有机无机钙钛矿型光伏电池的“工作马”，通过一步和两种步骤沉积方法生长，用于研究薄膜制备方法对其光稳定性的影响。在暴露于集中日光下，随时间变化的光吸收衰减被用来估计薄膜的降解。一步沉积的薄膜在通过基材照射时显示出CH3NH3PbI3吸光度的显着降低，而通过两步沉积获得的薄膜在相似的阳光照射下几乎没有光降解。另一方面，当通过顶部包封物照射时，两种类型的膜均显着降解。建议在基材附近存在未反应的PbI2，这有助于增强通过两步沉积获得的薄膜的光稳定性。在这里，残留的PbI2可以用作紫外线过滤剂，并减少紫外线引起的降解。结果证明了该制备方法对于确定钙钛矿薄膜的光化学稳定性的重要性，这归因于吸收剂中残留的PbI2作为紫外线保护层的良好特性。

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来源
《Solar Energy》 |2018年第1期|794-799|共6页
作者
Melvin Ambrose A.; Stoichkov Vasil Dimitrov; Kettle Jeff; Mogilyansky Dmitri; Katz Eugene A.; Visoly-Fisher Iris;
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作者单位

Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Swiss Inst Dryland Environm & Energy Res, Dept Solar Energy & Environm Phys, IL-8499000 Midreshet Ben Gurion, Israel;

Bangor Univ, Sch Elect Engn, Dean St, Bangor LL57 1UT, Gwynedd, Wales;

Bangor Univ, Sch Elect Engn, Dean St, Bangor LL57 1UT, Gwynedd, Wales;

Ben Gurion Univ Negev, Ilse Katz Inst Nanoscale Sci & Technol, IL-8410501 Beer Sheva, Israel;

Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Swiss Inst Dryland Environm & Energy Res, Dept Solar Energy & Environm Phys, IL-8499000 Midreshet Ben Gurion, Israel;

Ben Gurion Univ Negev, Jacob Blaustein Inst Desert Res, Swiss Inst Dryland Environm & Energy Res, Dept Solar Energy & Environm Phys, IL-8499000 Midreshet Ben Gurion, Israel;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类
关键词
Perovskites; Solar cell; Stability; Photodegradation; UV light;

机译：钙钛矿;太阳能电池;稳定性;光降解;紫外线;

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Lead iodide as a buffer layer in UV-induced degradation of CH_3NH_3PbI_3 films

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