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Elucidating understanding and realising device improvements in halide perovskite tandem cells through construction of a high-throughput characterisati

通过构建高通量表征阐明卤化物钙钛矿串联电池的理解和实现器件改进

基本信息

批准号：
2405021
负责人：
金额：
--
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2020
资助国家：
英国
起止时间：
2020 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2405021
关键词：
Elucidating understanding realising device improvements

项目摘要

Perovskite solar cells (PSCs) have rapidly become the most promising emerging photovoltaic technology. Less than a decade since their inception, PSCs have already achieved power conversion efficiencies comparable to silicon solar cells, the current market leader. This rapid development can be explained by the excellent optoelectronic properties of lead halide perovskites, such as high absorption coefficients and long carrier diffusion lengths, facile synthesis routes yielding high quality material and the possibility to tune material properties, such as the bandgap, by compositional engineering. Bandgap tuning makes it possible to make a perovskite tandem solar cell, where two sub-cells with a different bandgap perovskite are stacked on top of each other, allowing more efficient harvesting of the solar spectrum.Single junction PSCs have been studied using a wide range of techniques and device physics are increasingly well understood. This is much less the case for tandem devices, in part because research interest is only building now, but mainly because of the increased complexity of these device systems. The number of layers and interfaces is more than doubled, making design and understanding of photonic in-coupling and electronic charge collection a technical challenge, but one of paramount importance. In addition, processes in one of the sub-cells often cannot be studied fully independently from the other sub-cell.As fabrication and measurements are very time consuming, typically a minimal amount of samples is studied. This has led to contradictory and poorly reproducible reports in literature. In this project we aim to develop new high-throughput electronic and optical characterisation methods and use these to further our understanding of the energetic and photonic properties of tandem PSCs.ObjectivesObjective 1: Design and build a high-throughput setup to study optoelectronic processes at individual interfaces in tandem devices under operation.Objective 2: Measure fundamental electrical properties of tandem PSCs using the custom-built setup and study how these properties evolve under operating conditions (bias and illumination).Objective 3: Simulating device behaviour including photonic structures to maximise light absorption and device performance.

钙钛矿型太阳能电池(PSCs)已迅速成为最有前途的新兴光伏技术。PSC问世不到十年，就已经实现了可与目前市场领先者硅太阳能电池相媲美的电力转换效率。这一快速发展的原因是卤化铅钙钛矿优异的光电性能，如高吸收系数和长载流子扩散长度，合成路线简单，可以获得高质量的材料，以及可以通过组成工程来调节材料的性能，如带隙。带隙调谐使制作钙钛矿型串联太阳能电池成为可能，其中具有不同带隙的两个子电池堆叠在一起，允许更有效地获取太阳光谱。单结PSCs已经被使用了广泛的技术进行研究，并且对器件物理的了解越来越多。串列设备的情况要少得多，部分原因是研究兴趣现在才开始增强，但主要是因为这些设备系统的复杂性增加了。层数和界面的数量增加了一倍多，这使得设计和理解光子内耦合和电子电荷收集成为一项技术挑战，但也是至关重要的一项。此外，其中一个子单元中的工艺通常不能完全独立于另一个子单元来研究。由于制造和测量非常耗时，通常只研究最少量的样品。这导致了文献中相互矛盾且重复性差的报告。在这个项目中，我们的目标是开发新的高通量电学和光学表征方法，并利用这些方法来加深我们对串联PSC的能量和光子特性的理解。目标1：设计和建立一个高通量装置来研究串联器件中各个界面处的光电子过程。目标2：使用定制的装置测量串联PSC的基本电学特性，并研究这些特性在操作条件(偏压和照明)下如何演变。目标3：模拟器件行为，包括光子结构，以最大化光吸收和器件性能。