有机-无机钙钛矿材料中激子行为及相关光电性质研究

有机-无机杂化钙钛矿材料由于其在太阳能电池领域的优异表现受到了人们的极大关注。尽管人们对钙钛矿材料开展了广泛的研究,但是对于钙钛矿材料中激子（特别是二维结构钙钛矿中激子）的行为还缺乏清晰完备的认识。在本项目中，我们拟通过化学气相沉积法制备高质量的三维（3D）和二维（2D）结构钙钛矿晶体材料，利用稳态吸收和荧光光谱、拉曼光谱、瞬态吸收光谱等光谱学手段并结合相关的电学测量，系统研究3D和2D钙钛矿材料中的激子行为，探讨激子和光子、激子和表面等离激元、激子和谐振腔模式的强/弱相互作用。并进一步将这些研究结果应用到光电器件领域，研究激子在受限体系下的动力学行为，实现室温下低阈值的极化激元激光器和波色-爱因斯坦凝聚。该项目的实施将有助于解决该领域的一些关键科学问题，为钙钛矿基新型光电器件的功能优化和应用奠定基础。

Organic-inorganic perovskite materials have attained tremendous attentions for their excellent performance in photovoltaic field. Although the perovskite materials have been explored extensively, a clear understanding of the excitonic behavior (especially in 2D perovskite) is still lacking. In this project, we are planning to synthesize the high-quality 3D and 2D perovskite crystal firstly by CVD method. Then we use steady-state absorption and luminescence spectroscopy, Raman spectroscopy, and transient absorption spectroscopy, combing with the related electrical characterization techniques, systematically study the exciton behavior in 3D and 2D perovskite materials and explore the strong/weak interactions between excitons, photons, plasmonics and cavity modes, respectively. Furthermore, we will apply these results in the field of photonic devices and study the carrier dynamics in the confined systems for realizing the polariton lasing at room temperature with low threshold and Boss-Einstein Condensation. Implementation of this project will be helpful in solving some of the key scientific problems in this field, and also helpful in the optimization and application of perovskite based photoelectric devices.