具有超高亮度、超短脉冲、全相干特性的X射线自由电子激光（X-ray Free Electron Lasers,XFELs）的出现为超快时间研究与超微结构探索带来新的机遇,使得获取单分子、单颗粒原子分辨率图像及电影成为可能。随着德国FLASH、意大利FERMI、...具有超高亮度、超短脉冲、全相干特性的X射线自由电子激光（X-ray Free Electron Lasers,XFELs）的出现为超快时间研究与超微结构探索带来新的机遇,使得获取单分子、单颗粒原子分辨率图像及电影成为可能。随着德国FLASH、意大利FERMI、美国LCLS以及日本SACLA等装置的建成与投入使用,X射线自由电子激光已经进入了快速发展的阶段,一系列物理、化学、生物、材料科学领域的前沿研究成果不断涌现。为突破实验技术、工程设备及软件算法上的技术壁垒,相关科研机构通过国际合作,拟实现纳米颗粒、细菌、细胞、病毒、团簇及生物学大分子等单颗粒的原子分辨率成像。文章将聚焦单颗粒成像的发展历史、科学意义、研究背景、研究目标、研究规划、研究现状及世界各国的布局,并展望单颗粒成像未来的发展。展开更多
Understanding the correlation between the life- time, mobility and diffusion length of photoinduced charge carriers in organolead halide perovskite is essential to suc- cessful perovskite-based solar cells. In this pa...Understanding the correlation between the life- time, mobility and diffusion length of photoinduced charge carriers in organolead halide perovskite is essential to suc- cessful perovskite-based solar cells. In this paper, through mapping the local photoluminescence （PL） dynamics using laser/PL-scanned confocal imaging microscopy and simu- lating the carrier diffusion process in an individual CH3NH3PbI3 single-crystalline particle, we report that the rapid diffusion of charge carriers can produce a fast local PL kinetics when the perovskite is partially excited. This result indicates that using PL kinetics to estimate the carrier life- time in perovskite single crystals needs to exclude the effect of carrier diffusion.展开更多
文摘具有超高亮度、超短脉冲、全相干特性的X射线自由电子激光（X-ray Free Electron Lasers,XFELs）的出现为超快时间研究与超微结构探索带来新的机遇,使得获取单分子、单颗粒原子分辨率图像及电影成为可能。随着德国FLASH、意大利FERMI、美国LCLS以及日本SACLA等装置的建成与投入使用,X射线自由电子激光已经进入了快速发展的阶段,一系列物理、化学、生物、材料科学领域的前沿研究成果不断涌现。为突破实验技术、工程设备及软件算法上的技术壁垒,相关科研机构通过国际合作,拟实现纳米颗粒、细菌、细胞、病毒、团簇及生物学大分子等单颗粒的原子分辨率成像。文章将聚焦单颗粒成像的发展历史、科学意义、研究背景、研究目标、研究规划、研究现状及世界各国的布局,并展望单颗粒成像未来的发展。
基金supported by the State Key Laboratory of Molecular Reaction Dynamics at Dalian Institute of Chemical Physics of Chinese Academy of Sciencesthe National Natural Science Foundation of China(21473192)the National Basic Research Program of China(2013CB834604)
文摘Understanding the correlation between the life- time, mobility and diffusion length of photoinduced charge carriers in organolead halide perovskite is essential to suc- cessful perovskite-based solar cells. In this paper, through mapping the local photoluminescence （PL） dynamics using laser/PL-scanned confocal imaging microscopy and simu- lating the carrier diffusion process in an individual CH3NH3PbI3 single-crystalline particle, we report that the rapid diffusion of charge carriers can produce a fast local PL kinetics when the perovskite is partially excited. This result indicates that using PL kinetics to estimate the carrier life- time in perovskite single crystals needs to exclude the effect of carrier diffusion.
