钙钛矿太阳能材料在太阳光照下的本征载流子动力学研究的测量数据集

近10年来，钙钛矿太阳能电池技术发展迅速，其具有较低的制造成本和高的太阳能转化效率，被认为是最有潜在价值的材料之一。理解光生载流子动力学对材料制备和器件设计具有重要意义，飞秒瞬态吸收光谱（Transient Absorption, TA）是一种常用的主要研究手段。然而，受限于常规的TA光谱仪的探测灵敏度，瞬态吸收一般只能探测较高载流子浓度下的动力学过程。
本数据针对课题二中关键科学问题“如何精确表征有机/无机复合纳米材料界面、电子/空穴传输层界面分子结构与界面激发态过程，提炼其影响光电化学转换效率等性能的基本规律”，围绕光转换材料结构如何调控其性能这一问题，发展技术，实现钙钛矿太阳能材料在太阳光照下的本征载流子动力学研究。数据量大小为62.3MB。
采集方案：（1）在较高激发功率密度下，扫描探测光(白光)和泵浦光(517.5 nm)的时间延迟来采集时间分辨瞬态吸收光谱；（2）对于特征漂白峰的位置，采用高灵敏采集方案，改变不同的激发功率密度，获得载流子密度依赖的动力学；（3）实现很低载流子密度下的载流子动力学，并且发现继续降低载流子密度，动力学曲线不再发生变化，也就是太阳光照下的本征动力学也应该是这样的。

Over the past decade, perovskite solar cell technology has advanced rapidly. Perovskite, featuring low manufacturing costs and high solar energy conversion efficiency, is regarded as one of the most promising photovoltaic materials. Understanding the dynamics of photogenerated charge carriers is critical for material fabrication and device design, and femtosecond transient absorption (TA) spectroscopy is a widely used primary research technique. However, limited by the detection sensitivity of conventional TA spectrometers, transient absorption spectroscopy can only typically detect dynamic processes at relatively high charge carrier concentrations.

This dataset targets the key scientific issue in Project 2: "How to accurately characterize the molecular structures and interfacial excited-state processes at the interfaces of organic/inorganic composite nanomaterials and electron/hole transport layers, and extract the fundamental rules governing their effects on properties such as photoelectrochemical conversion efficiency". Focusing on the question of how the structure of light-conversion materials regulates their performance, relevant technologies were developed to conduct research on the intrinsic charge carrier dynamics of perovskite solar materials under solar illumination. The total size of this dataset is 62.3 MB.

Collection protocols:
(1) Time-resolved transient absorption spectra were collected by scanning the time delay between the probe beam (white light) and the pump beam (517.5 nm) under a relatively high excitation power density;
(2) For the positions of characteristic bleaching peaks, a high-sensitivity collection protocol was adopted by varying different excitation power densities to obtain charge carrier density-dependent dynamics;
(3) Charge carrier dynamics at extremely low charge carrier densities were achieved. It was found that when the charge carrier density was further reduced, the dynamic curves no longer changed, which indicates that the intrinsic dynamics under solar illumination should follow this pattern.

搜集汇总

背景与挑战

背景概述

该数据集专注于钙钛矿太阳能材料在太阳光照下的本征载流子动力学研究，旨在通过发展高灵敏技术来精确表征界面和激发态过程，以理解光生载流子动力学对材料制备和器件设计的关键作用。数据集包含62.3MB的测量数据，用于支持相关科学问题的探索。