Dynamics of Energy Transfer in Perovskite Nanostructures for Optoelectronic Applications

用于光电应用的钙钛矿纳米结构的能量转移动力学

• 批准号: 2590276
• 金额: --
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2590276
• 关键词: Dynamics; Energy; Transfer; Perovskite; Nanostructures

Nanomaterials are emerging as important components in many optoelectronic devices such as solar cells, LEDs, and photodetectors. Although their small size makes them attractive from an engineering standpoint, there are significant challenges in working with nanoscale semiconductors: optoelectronic properties change due to confinement effects that can restrict charge movement, and surface states can act as electron traps. One strategy to counteract these effects is to design energy transfer pathways by combining nanomaterials into heterostructures, where the flow of energy can be intimately controlled. This project will investigate energy transfer processes in a range of heterostructures built from layered hybrid metal halide perovskites, an exceptional class of materials that in thin-film form is already attractive for solar energy applications. However, in perovskite nanomaterials the presence of additional interfaces can provide extra locations for energy loss, sometimes at rates that are detrimental to device performance. Here, the rates of different energy transfer processes within and between the different materials of a heterostructure will be studied on multiple timescales, from the femtosecond to the millisecond range, in order to better understand the intrinsic and extrinsic optoelectronic performance of these new materials.This experimental PhD project will use ultrafast spectroscopy techniques including optical-pump/THz probe spectroscopy, a non-contact optical technique with proven success in studying the optoelectronic properties relevant for device applications. The project will utilize many of the advanced spectroscopy and microscopy capabilities at the university, including the resources of the Warwick Centre for Ultrafast Spectroscopy (go.warwick.ac.uk/WCUS).

纳米材料正在成为太阳能电池、LED 和光电探测器等许多光电器件的重要组成部分。尽管从工程角度来看，它们的小尺寸使其具有吸引力，但在使用纳米级半导体时存在重大挑战：由于限制电荷运动的限制效应而导致光电特性发生变化，并且表面态可以充当电子陷阱。抵消这些影响的一种策略是通过将纳米材料组合成异质结构来设计能量转移途径，在异质结构中可以密切控制能量的流动。该项目将研究由层状杂化金属卤化物钙钛矿构建的一系列异质结构中的能量转移过程，钙钛矿是一种特殊的薄膜材料，对于太阳能应用来说已经很有吸引力。然而，在钙钛矿纳米材料中，额外界面的存在可能会提供额外的能量损失位置，有时会损害器件性能。在这里，将在从飞秒到毫秒范围的多个时间尺度上研究异质结构的不同材料内部和之间的不同能量转移过程的速率，以便更好地了解这些新材料的内在和外在光电性能。该实验博士项目将使用超快光谱技术，包括光泵/太赫兹探针光谱，这是一种非接触式光学技术 在研究与设备应用相关的光电特性方面已取得了成功。该项目将利用该大学许多先进的光谱学和显微镜能力，包括沃里克超快光谱学中心（go.warwick.ac.uk/WCUS）的资源。