Design of Halide Perovskite Photonic Crystals for Solar Energy Conversion

在过去十年中，由于化石燃料的短缺和不断出现的环境问题，人们对可持续清洁能源的兴趣和需求日益增加。太阳能已经引起了人们的极大兴趣，因为它有潜力提供世界人口增长和经济扩张所需的大量能源。尽管经过数十年的研究，但尚未发现满足有效太阳能转换的所有技术和经济要求的材料。因此，需要设计和工程化新材料。在这个项目中，我提出了一种非传统的方法来设计用于太阳能转换的集成钙钛矿光子晶体系统。独特的创新概念是基于通过温和的模板方法设计具有光子晶体结构的粉末和薄膜形态的卤化物钙钛矿。该项目的主要目标是制备新型定义明确的纳米结构钙钛矿及其详细表征，以了解周期性结构如何提高钙钛矿太阳能电池的性能。也将尝试制备具有较少结构缺陷和晶界的单晶钙钛矿光子晶体。为了增强卤化物钙钛矿的稳定性以及钙钛矿和空穴传输层之间的接触，将研究基于空穴传输层在钙钛矿上的光催化聚合/沉积的开创性器件制造策略。有机金属三卤化物钙钛矿材料中光子晶体的周期性有序形态、光捕获能力和较长光程等独特性质将创造出独特的光伏器件，并使其效率超越现有技术。

In the last decade, there has been a growing interest and need for sustainable clean energy owing to the shortage of fossil fuels and arising environmental issues. Solar energy has gained noteworthy interest since it has the potential to provide enormous amounts of energy required by the increasing population and economic expansion of the world. In spite of decades of research, a material that fulfills all the technical and economic requirements for effective solar energy conversion has not been discovered yet. Thus, novel materials are needed to be designed and engineered. In this project, I propose an unconventional approach for designing an integrated perovskite photonic crystal system for solar energy conversion. The unique innovative concept is based on the design of halide perovskites with photonic crystal structure in powder and thin film morphologies through a mild templating approach. The key goals of the project are the preparation of novel well-defined nanostructured perovskites and their detailed characterization to understand how periodic structuring can enhance the performance of perovskite solar cells. Single crystalline perovskite photonic crystals that have less structural defects and crystal grain boundaries will be attempted to prepare as well. In order to enhance the stability of the halide perovskites and contact between perovskite and hole transfer layers, a pioneering device fabrication strategy that is based on the photocatalytic polymerization/deposition of the hole transfer layer on perovskite will be investigated. Unique properties like periodically well-ordered morphology, light trapping ability and longer optical path of photonic crystal within organometal trihalide perovskite materials will create a distinctive photovoltaic device and allow its efficiency to go beyond the state of the art.