"Interface Engineering for Maximizing the Efficiency of Halide Perovskite Indoor Photovoltaics"

室内光伏(IPVS)设备将建筑物内的白光LED和荧光灯等人造光源发出的光转化为电能。IPV由于其在物联网(IoT)这一巨大技术领域的潜在应用，最近受到了极大的研究关注。到2025年，将有超过750亿台物联网设备互联，其中一半的组件将安装在建筑物内。可持续地为这些传感器供电是一个巨大的挑战。光能在环境中是可利用的，可以通过光伏设备轻松获取，而不需要额外的设备或多次能量转移，因此成为最有前途的物联网传感器系统的候选者。根据输入光谱的不同，室内光伏功率转换效率的肖克利-奎瑟(S-Q)极限为45-65%。实现理论效率的主要限制因素之一是高开路电压(VOC)损耗。在这个项目中，我们将研究界面工程在卤化物钙钛矿型室内光伏器件中最小化这些开路电压所起的作用。我们将研究光活性材料中的体界面和光活性层/电荷传输层的埋藏界面。光生载流子的动态特性将通过瞬时光伏测量来表征，例如瞬时电流、瞬时光伏，这些载流子的迁移率将通过空间电荷限制电流法进行研究，界面作用将通过光伏器件的阻抗谱从整体中分离出来。

Indoor photovoltaic (IPVs) devices convert light from artificial light sources such as white LED and fluorescent lamps inside the buildings to electrical energy. IPVs are receiving great research attention recently due to their projected application in the huge technology field of the Internet of Things (IoT). By 2025, there will be more than 75 billion connected IoT devices with half of the components to be installed inside the buildings. Sustainably powering these sensors is a huge challenge. Light energy is available in the ambient environment and can be accessed easily via photovoltaic devices without requesting additional devices or multiple energy transfer, thus becomes the most promising candidate to power IoT sensor system. The Shockley-Queisser (S-Q) limit of power conversion efficiency of indoor photovoltaic is 45- 65 % depending on the input light spectrum. One of the main limiting factors in achieving theoretical efficiency is the high open-circuit voltage (Voc) losses. In this project, we will investigate the role of interface engineering to minimize these open-circuit voltages in halide perovskite indoor photovoltaic devices. Both the bulk interface in the photoactive materials and the buried interface at the photoactive layer/charge-transporting layers will be studied. The photogenerated carrier dynamics will be characterised using transient photovoltaic measurements such as transient current, transient photovoltage, and mobility of these carriers will be investigated through space charge limited current method and interface role will be isolated from the bulk using the impedance spectroscopy of the photovoltaic devices.