论文总字数：15403字

摘 要

随着信息化时代的到来，高速大容量数据通信的需求更加迫切，因此高效低能耗的新型激光器的开发成为研究热点。金属卤化物钙钛矿材料凭借宽范围可调节波长、高载流子迁移率、良好光学增益性等优点，在光学器件领域有着广阔的应用前景，但由于钙钛矿材料普遍光热稳定性较差，进一步的发展被阻碍。石墨烯作为一种具有表面等离子体特性的非金属材料，具有高导电性、导热性等优秀性能，将其与钙钛矿组成复合结构后，一方面可以利用高导热性来传递热量提高钙钛矿稳定性，另一方面可以利用石墨烯在太赫兹波段的表面等离子特性，通过降低材料的激发阈值，实现增强钙钛矿激光的目的。本文通过用325nm的飞秒激光分别激发CH₃NH₃PbBr₃单晶及其与石墨烯组成的复合结构，收集PL光谱进行对比，发现复合结构的激发阈值大约降低了17%，同泵浦功率下，激光输出强度大幅增强。由于石墨烯在红外/太赫兹波段有良好的表面等离子体响应，我们猜想，通过再加一束800 nm的飞秒激光构成双光束能进一步增强钙钛矿激光发射。

关键词： 金属卤化物钙钛矿；石墨烯；激光

Double beam excitation enhanced graphene/perovskite composite structure of laser emission

Abstract

As the information age is coming, the demand for high-speed and large-capacity data communication becomes more urgent. Therefore, the development of new laser device with high efficiency and low energy consumption has become a research hotspot. Metal halide perovskite materials have broad application prospects in In the field of optics due to their wide range of adjustable wavelength, high carrier mobility and good optical gain. However,further development is hindered because of the poor photothermal stability of perovskite materials .As a non-metallic material with surface plasmon properties, graphene has good excellent properties like high-thermal conductivity. When it is combined with perovskite, graphene can be used to transfer heat to improve the stability of perovskite. On the other hand, perovskite excitation threshold can be reduced by using the effect of surface plasmon properties of graphene in terahertz band, so as to enhance the laser emission of perovskite.In this paper, the single crystal of CH₃NH₃PbBr₃ and its composite structure with graphene were excited by a femosecond laser at 325nm, and the PL spectrum was collected for comparison. It was found that the excitation threshold of the composite structure was reduced by about 17%, and the laser output intensity was significantly enhanced under the same pumping power.Since graphene has a good surface plasmon response in the infrared/terahertz band,we hypothesized that the perovskite laser could be further enhanced by adding an 800nm femtosecond laser beam to form a double beam.

Key words: metal halide perovskite; graphene; laser

目录

摘要 I

Abstract II

第一章绪论 1

1.1研究背景与意义 1

1.2钙钛矿材料 1

1.3钙钛矿激光器的研究 3

1.4钙钛矿材料存在的问题 4

1.5石墨烯材料 6

1.6石墨烯/钙钛矿复合结构的研究 7

1.7研究目的及内容 8

第二章样品的制备及表征 10

2.1石墨烯的转移 10

2.2钙钛矿单晶的制备 10

2.3石墨烯及钙钛矿的表征 11

第三章 石墨烯/钙钛矿复合结构的激光发射特性 13

3.1实验内容 13

3.2数据分析 13

第四章总结与展望 16

4.1总结 16

4.2展望 16

参考文献 17

致谢 19

第一章绪论

1.1研究背景与意义

激光自其问世以来一直是研究的热点，并且随着研究的深入，激光本身独特性能使其在激光测量、激光通信、农林牧业、文娱教育、军事、医疗和工业生产等领域得到了大量应用^[1]，推动了科技的变革。如今，随着第四次工业革命的到来，全球信息化程度不断加深，数据通信对高速度大容量的需求变得更加苛刻。在这种情况下，高效低能耗的激光器的研究也更加迫切，成为未来科学发展的重要方向之一。

激光产生有四个必要条件：a.粒子数反转；b.泵浦源；c.增益介质；d.谐振腔。这四个条件实现的难度又在很大程度上受到激光器材料的影响，因此在高效激光器的研发过程中，选择合适的材料尤其重要。其中钙钛矿材料凭借它优秀的光电性能成为激光领域研究的热点。

1.2钙钛矿材料

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