激发能在卤化物钙钛矿薄膜光致增亮和光降解中的作用
The Role of Excitation Energy in Photobrightening and Photodegradation of Halide Perovskite Thin Films.
作者信息
Quitsch Wolf-Alexander, deQuilettes Dane W, Pfingsten Oliver, Schmitz Alexander, Ognjanovic Stevan, Jariwala Sarthak, Koch Susanne, Winterer Markus, Ginger David S, Bacher Gerd
机构信息
Werkstoffe der Elektrotechnik and CENIDE , University of Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany.
Department of Chemistry , University of Washington , Box 351700, Seattle , Washington 98195-1700 , United States.
出版信息
J Phys Chem Lett. 2018 Apr 19;9(8):2062-2069. doi: 10.1021/acs.jpclett.8b00212. Epub 2018 Apr 10.
We study the impact of excitation energy on the photostability of methylammonium lead triiodide (CHNHPbI or MAPI) perovskite thin films. Light soaking leads to a transient increase of the photoluminescence efficiency at excitation wavelengths longer than 520 nm, whereas light-induced degradation occurs when exciting the films with wavelengths shorter than 520 nm. X-ray diffraction and extinction measurements reveal the light-induced decomposition of CHNHPbI to lead iodide (PbI) for the high-energy excitation regime. We propose a model explaining the energy dependence of the photostability that involves the photoexcitation of residual PbI species in the perovskite triggering the decomposition of CHNHPbI.
我们研究了激发能量对甲基碘化铅（CH₃NH₃PbI₃或MAPI）钙钛矿薄膜光稳定性的影响。光浸泡导致在激发波长大于520 nm时光致发光效率出现短暂增加，而当用波长小于520 nm的光激发薄膜时会发生光诱导降解。X射线衍射和消光测量揭示了在高能激发条件下CH₃NH₃PbI₃光诱导分解为碘化铅（PbI₂）。我们提出了一个解释光稳定性能量依赖性的模型，该模型涉及钙钛矿中残留PbI₂物种的光激发引发CH₃NH₃PbI₃的分解。
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