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Formation process of organic/inorganic superlattice structure using layered perovskite compounds with self-organization property

具有自组织特性的层状钙钛矿化合物有机/无机超晶格结构的形成过程

基本信息

批准号：
11650017
负责人：
ZOU Dechun
金额：
$ 2.05万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The propose of this research is to clarify the mechanism of the formation process of layered perovskite compounds formed superlattice and optimize the evaporation conditions in preparing perovskite film with high quantum efficiency We firstly improved the old evaporation system, and make it is possible to automatically and real-time measure the absorption property of the perovskite film. Then we invistgated some factors affecting the formation process of the perovskite film, optimized the conditions for getting perovskite film with high quantum efficiency. Finally we corporate the perovskite layer into an electrolumonescent device, and investigated the emission property of the device. The influence of the humidity on the formation process of the perovskite film was investigated. It was found that the humidity could strongly affect the formation process. By quantitative analyses of the relationship between the humidity and the absorption property of perovskite film, it was strongly sugg … More ested that, in the formation process, the PBI2 act as a fixed phase and the organic amine as a moving (migration) phase. The humidity (water) mainly affects the migration phase, i.e. speed up the migration. It also found that in any case, even the mole ratio of the organic amine against the PbI2 far exceeds a unity, there is still some un-reacted PbI2 remaining in the film, and co-exists with the perovskite compound. Highest quantum efficiency of the emission was get when the mole ratio of the organic amine against the PbI2 equals 3. From this result, it is speculated that, in the formation process, PbI2 acts as a fixed phase and organic amine acts as a moving phase. We also found that, in a temperature change range of about 200K, the quantum efficiency of the emission could changes by several decades. This big implies that the remained PbI2 acts as a quench center against the cxction. Electrolminescent device with the layered perovskite film as an emission layer fabricated. Bright and sharp emission from the perovskite layer was observed when a DC voltage was exerted on the device. This phenomenon implies that the used perovskite layer has enough carrier transport capability, and the carrier re-combination can occur at perovskite compound. This result shows us a great possibility to use perovskite layer as an active material in an opt-electronic device. Less

本研究旨在阐明层状钙钛矿化合物形成超晶格的过程机理，优化制备高量子效率钙钛矿薄膜的蒸发条件。首先对原有的蒸发系统进行了改进，使钙钛矿薄膜吸收特性的自动实时测量成为可能。考察了影响钙钛矿薄膜形成过程的因素，优化了制备高量子效率钙钛矿薄膜的条件。最后，我们将钙钛矿层制成电致发光器件，并对器件的发光特性进行了研究。研究了湿度对钙钛矿薄膜形成过程的影响。结果表明，湿度对形成过程有很大的影响。通过定量分析湿度与钙钛矿薄膜吸收性能的关系， ...更多信息实验表明，在形成过程中，PBI 2作为固定相，有机胺作为移动（迁移）相。湿度（水）主要影响迁移阶段，即加速迁移。还发现，在任何情况下，即使有机胺与PbI2的摩尔比远远超过1，仍有一些未反应的PbI2残留在膜中，并与钙钛矿化合物共存。当有机胺与PbI_2的摩尔比为3时，发光量子效率最高。从该结果推测，在形成过程中，PbI2充当固定相，有机胺充当移动相。我们还发现，在200K左右的温度变化范围内，发射的量子效率可以发生几十年的变化。这意味着剩余的PbI2作为猝灭中心对抗cxxl2。制备了以层状钙钛矿薄膜为发光层的电致发光器件。当在器件上施加DC电压时，观察到来自钙钛矿层的明亮且尖锐的发射。这一现象表明所用的钙钛矿层具有足够的载流子输运能力，并且在钙钛矿化合物处可以发生载流子复合。这一结果表明，我们有很大的可能性，使用钙钛矿层作为光电器件中的活性材料。少