Using microgels to control the morphology and optoelectronic properties of hybrid organic-inorganic perovskite films.
Using microgels to control the morphology and optoelectronic properties of hybrid organic-inorganic perovskite films.
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DOI：
10.1039/c8cp05148h
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Chotiros Dokkhan;M. Mokhtar;Qian Chen;B. Saunders;N. Hodson;B. Hamilton
中科院分区：
文献类型：
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作者：
Chotiros Dokkhan;M. Mokhtar;Qian Chen;B. Saunders;N. Hodson;B. Hamilton
微凝胶（MG）是在良溶剂中溶胀的交联聚合物胶体颗粒。虽然MG已经研究了80多年，但其控制含有光活性材料的复合膜的形态和光电性能的能力仍处于起步阶段。可溶液加工的有机-无机杂化钙钛矿化合物（如CH 3 NH3 PbI 3-zClz）由于其优异的光电性能而引起了人们极大的兴趣。在建立控制钙钛矿膜形态的方法方面存在相当大的兴趣，例如，使用微图案化。在这里，亲水性聚（N-乙烯基甲酰胺）基MG分散在钙钛矿前体溶液中，然后将其旋涂以首次存款CH 3 NH3 PbI 3-zClz/MG膜。值得注意的是，CH 3 NH3 PbI 3-zClz/MG复合物形成了无序的反蛋白石（DIO）膜。CH 3 NH3 PbI 3-zClz/MG组合物的范围内，得到DIO膜确定使用相图。孔壁厚度被证明是由所使用的MG的体积分数控制，并提出了一个简单的模型来解释这种行为。MG不仅导致CH_3 NH_3 PbI_（3-zClz）更有效地沉积，而且还增加了光吸收和光致发光强度。包含DIO CH 3 NH3 PbI 3-zClz/MG膜构造的示范太阳能电池具有6.58 ± 0.81%的平均转换效率。讨论了DIO膜的形成机理。本研究中所建立的MG控制CH_3 NH_3 PbI_3-zClz/MG薄膜的形貌和性能的原理也适用于其他钙钛矿/MG复合材料。
Microgels (MGs) are crosslinked polymer colloid particles that swell in a good solvent. Although MGs have been studied for over 80 years their ability to control the morphology and optoelectronic properties of composite films containing photoactive materials is in its infancy. Solution processable hybrid organic-inorganic perovskites such as CH3NH3PbI3-zClz have attracted enormous fundamental and applied interest because of their outstanding optoelectronic properties. There is considerable interest in establishing methods to control perovskite film morphology, for example, using micropatterning. Here, hydrophilic poly(N-vinylformamide)-based MGs were dispersed in perovskite precursor solution which was then spin coated to deposit CH3NH3PbI3-zClz/MG films for the first time. Remarkably, the CH3NH3PbI3-zClz/MG composites formed disordered inverse opal (DIO) films. The CH3NH3PbI3-zClz/MG composition ranges which gave DIO films are identified using a phase diagram. The pore wall thickness is shown to be controlled by the volume fraction of MGs used and a simple model is presented to explain this behaviour. The MGs not only caused CH3NH3PbI3-zClz to be more efficiently deposited but also increased light absorption and photoluminescence intensity. Demonstration solar cells constructed containing the DIO CH3NH3PbI3-zClz/MG films had an average conversion efficiency of 6.58 ± 0.81%. A mechanism for DIO film formation is discussed. The principles established in this study wherein MGs control the morphology and properties of CH3NH3PbI3-zClz/MG films should also apply to other perovskite/MG composites.