Investigation of moisture stability and PL characteristics of terpineol-passivated organic-inorganic hybrid perovskite
Investigation of moisture stability and PL characteristics of terpineol-passivated organic-inorganic hybrid perovskite
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DOI：
10.1007/s40243-016-0081-1
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发表时间：
2016-11-01
影响因子：
4.5
通讯作者：
Burda, Clemens
中科院分区：
文献类型：
--
作者：
Guo, Xin;McCleese, Christopher;Burda, Clemens
本工作提出了一种新的方法来制备钙钛矿薄膜，使用一个简单的处理技术。通过在搅拌下将PbI 2和甲基碘化铵粉末的等摩尔混合物分散到松油醇中来制备过氧化物糊剂。从这些前体，钙钛矿薄膜制造使用刮刀和干燥24小时，在室温下。然后将制备的膜置于30、50和70%的相对湿度（RH）水平中以测试水分稳定性。采用XRD、SEM/EDX等分析手段对样品的晶体结构、物相和形貌进行了表征。这些样品表现出良好的稳定性，长期暴露于水分70天。XRD结果表明，在RH 70%下储存的样品在储存70天后仅含有少量的水合物化合物，而在RH 50%下储存的样品中，观察到PbI 2的形成。当储存相同的储存期时，RH 30%的样品几乎没有变化。我们属性的增强的水分稳定性，与旋涂样品相比，由萜品醇表现出疏水部分的钙钛矿膜的钝化表面。时间分辨的光致发光测量表明，通过形成PbI 2或水合化合物的表面缺陷态的钝化导致延长的电荷载流子复合时间。
This work presents a novel method for preparing perovskite films using a simple processing technique. Perovskite paste was prepared by dispersing an equimolar mix of PbI2 and methyl ammonium iodide powders into terpineol with stirring. From these precursors, perovskite films were fabricated using doctor blading and drying for 24 h at room temperature. The prepared films were then placed into relative humidity (RH) levels of 30, 50, and 70 % to test the moisture stability. The crystal structure, phases, and morphology were investigated with XRD and SEM/EDX. These samples exhibited good stability against long time exposure to moisture for 70 days. The XRD results showed that samples stored at RH 70 % contained only a small amount of hydrate compound after 70 days storage, while in the sample stored at RH 50 %, the formation of PbI2 was observed. The sample at RH 30 % manifested almost no change when stored for the same storage period. We attribute the enhanced moisture stability, compared with the spin-coated samples, to a passivated surface of the perovskite film by terpineol which exhibits a hydrophobic moiety. Time-resolved photoluminescence measurements show that the passivation of surface defect states by the formation of either PbI2 or hydrated compound leads to prolonged charge carrier recombination times.