基于铯的卤化铅钙钛矿微米线激光器与光子探测研究

发布时间：2018-03-31 22:00

本文选题：铯的钙钛矿微米线　切入点：双光子泵浦　出处：《哈尔滨工业大学》2017年硕士论文

【摘要】：微型激光器作为有源器件在集成光电子领域有着重要应用,它可以为系统提供光源,与其他集成器件一起形成具有实际功能的微型光路。随着纯无机铯的钙钛矿出现,其优异的光学性能使它很快成为新一代半导体材料。无机铯的钙钛矿以晶体的形式存在,具有微米线状结构,在泵浦激光的激发下能够出射激光,形成天然的微型激光器。然而,传统制备方法复杂、成本过高,制备出的微米线横截面尺寸小,只能支持具有较低品质因数的法布里-珀罗模式激光;并且由于样品质量不佳,应用于光子探测时响应速度慢。本文为解决该问题,改进了一步溶液法来制备纯无机铯的钙钛矿,开展其激光性质和光子探测能力研究。针对预期要求,提出了制备拥有较大横截面尺寸的钙钛矿微米线。通过对钙钛矿制备方法的调研和反复摸索,本文改进了一步溶液合成法,成功制备出高质量、形貌统一并且拥有较大横截面尺寸的微米线。本文以铯的溴化铅钙钛矿微米线为例,采用飞秒脉冲激光泵浦,首次在其横截面内实现回音壁模式激光,并且品质因数最高达7000。通过双光子泵浦,研究了微米线的非线性效应。同时对被测样品建立模型进行仿真,证实了实验结果的准确性。理论上,纯无机钙钛矿的稳定性优于有机-无机杂化钙钛矿,基于此,本文在飞秒脉冲激光连续泵浦和高温加热下,研究了两者出射激光的稳定性,得出和理论一致的结果。铯的溴化铅钙钛矿微米线除了具有优秀的激光特性,本文还研究了其光子探测性能。通过真空电子束蒸镀制备出金膜电极并且搭建三维转移平台,借助拉锥光纤将微米线转移至金膜电极上,研究了微米线在不同条件下光生电流的变化,测量得到光子探测的响应时间低至8 ms,比之前相关报道低了两个数量级,实现了快速探测。铯的溴化铅钙钛矿微米线的系统研究,为以后集成光电子器件的发展提供了有利的帮助。
[Abstract]:As the active element micro laser has important application in the field of Integrated Optoelectronics, it can provide a source for the formation of micro optical system, together with practical function and other integrated devices. With the pure inorganic cesium perovskite, its excellent optical properties so that it will soon become a new generation of semiconductor materials. The existence of cesium inorganic perovskite in crystal form, with micron structure, can laser excitation in pumped laser, laser micro forming natural. However, the traditional preparation method of complex, high cost, the prepared micron line cross section size is small, can only support with low quality factor Fabri Perot laser and mode; due to the poor quality of the sample, used in photon detection when the slow response speed. In this paper, in order to solve this problem, the improved one step solution method to prepare pure cesium inorganic perovskite, carry out the laser Study on the properties and photon detection ability. According to the expected requirements, proposed preparation has a larger cross-sectional size of the perovskite microwires. Through research on perovskite preparation method and trial and error, this paper improves the solution step synthesis method was successfully prepared by high quality, uniform morphology and has larger cross-section size of micron line. The lead bromide cesium perovskite microwires as an example, by using femtosecond pulsed laser pumped laser for the first time, the echo wall mode in the cross section, and the quality factor of up to 7000. by two photon pumped, nonlinear effect of micron line. At the same time of the measured sample to establish simulation model, confirmed the accuracy of the test result. In theory, the stability is better than that of pure inorganic perovskite type organic-inorganic hybrid perovskite structure, based on this, this article in the femtosecond pulse laser pumped and high temperature heating, is studied The stability of laser, and obtained consistent results. The theory of perovskite lead bromide cesium microwires has excellent laser characteristics, this paper also studies the photon detection performance. By vacuum electron beam evaporation preparation of gold film electrode and build a three-dimensional transfer platform, with the help of the tapered fiber micro wire transfer to the gold film electrode, were studied under different conditions of micron line photocurrent, the measured response time of photon detection as low as 8 ms, two orders of magnitude lower than that before the relevant reports, to achieve a rapid detection system. Research on perovskite lead bromide cesium microwires, for the future development integrated optoelectronic devices provide beneficial help.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN248

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