【作者】 杨柳；

【导师】 鲍永军；

【作者基本信息】 吉林大学 ， 凝聚态物理， 2020， 硕士

【摘要】 纳米激光器作为未来薄膜显示、集成光学、光通信技术的重要组成部分,具有广泛的应用前景,是微纳光学领域的研究热点。钙钛矿半导体材料具有优异的扩散长度、光学吸收度和载流子活性,是制备在室温工作的具有波长可调谐的低激射阈值纳米激光器的理想材料。本论文我们系统研究了利用化学气相沉积方法制备的CsPbI₃三棱锥温度依赖的光激射行为,取得了如下的具体成果。首先,通过控制化学气相沉积方法的气压、载气流速、温区分布,找到了合成CsPbI₃三棱锥的实验条件,制备出了具有光滑平面、清晰棱边的规则CsPbI₃三棱锥样品。其次,通过在不同温度下比较单个CsPbI₃三棱锥的光致发光谱随泵浦光强度变化,发现了光激射的存在与激子束缚能之间的关联,确定了CsPbI₃三棱锥光激射的激子来源。最后,发现CsPbI₃三棱锥的激射阈值具有e指数的依赖关系,其特征温度为72.73 K,揭示了CsPbI₃三棱锥的激射阈值随温度变化的关系;综上所述,我们将化学气相沉积合成方法和变温光谱测量系统结合,系统的研究了CsPbI₃三棱锥在低温度下的光激射行为。这些结果为我们设计和优化基于钙钛矿材料的光电子器件以及研究光-物质在半导体微腔中的相互作用提供了一个新视角。更多还原

【Abstract】 As an important part of film display,integrated optics and optical communication technology in the future,nano-laser has a wide application prospect and is a hot research topic in the field of micro-nano optics.Perovskite semiconductor materials with excellent diffusion length,optical absorption and carrier activity are ideal materials for the fabrication of low lasing threshold nanolaser with wavelength tunability operating at room temperature.In this paper,we systematically study the temperature dependent lasing behavior of CsPbI₃ triangular pyramid prepared by chemical vapor deposition method,and obtain the following specific results.Firstly,by controlling pressure,carrier gas flow rate,and temperature zone distribution of the chemical vapor deposition method,the experimental conditions for the synthesis of CsPbI₃ triangular pyramid are found,and regular CsPbI₃ triangular pyramid samples with smooth plane and clear edges are prepared.Secondly,by comparing the photoluminescence spectra of a single CsPbI₃triangular pyramid with the pump light intensity at different temperatures,the correlation between the presence of lasing and the exciton binding energy is found,and the exciton source of the lasing of CsPbI₃ triangular pyramid is determined.Finally,it is found that the lasing threshold of CsPbI₃ triangular pyramid has a dependence of e index,and its characteristic temperature is 72.73 k,which reveals the relationship between the lasing threshold of CsPbI₃ triangular pyramid and temperature.In conclusion,we combine the chemical vapor deposition synthesis method with the variable temperature spectrum measurement system to systematically study the lasing behavior of the CsPbI₃ triangular pyramid at low temperature.These results provide a new perspective for us to design and optimize optoelectronic devices based on perovskite materials and to study the interaction of light-matter in semiconductor microcavities.更多还原