Description of field of research:

The significant developments in fabrication of high-efficiency single-junction perovskite solar cells (PSC) with power conversion efficiencies greater than 25% and two-terminal perovskite/silicon tandem solar cells (TSC) with efficiencies beyond 29%, have made the community optimistic about the future commercialisation of the technology. Nevertheless, there remains two key challenges for the tandem technology, which needs to be addressed, so to make it competitive: i) long-term stability and ii) device area upscaling of the perovskite top-cell. The perovskite top-cell in the TSC eventually needs to become about the same size as that of the bottom silicon cell, without sacrificing its performance. Critical aspects of PSCs upscaling are to achieve homogeneous perovskite absorber layer and selective contacts, as well as minimal resistive losses. Therefore, development of suitable characterisation techniques, which can reliably and rapidly identify the factors contributing to these two main issues, is essential.

In this exciting project, you will learn to use different luminescence measurement techniques including spectral photo- (PL) and electro-luminescence (EL), time-resolved PL measurements, and camera-based PL and EL imaging. For this purpose, you will use home-build setups, which allows you to do more than click-and-go measurements. You will advance your understanding of the physics of luminescence signal detected from semiconductor materials and the associated devices. Equipped with this knowledge, we aim to develop method(s) to extract spatially resolved information about the electronic properties of the single-junction perovskite solar cells as well as the perovskite and silicon sub-cells in two-terminal perovskite/silicon tandem devices. Of high significance are the implied open-circuit voltage and series resistance of the sub-cells. This project aims to progress towards addressing a bigger picture, industrial need for rapid and robust characterisation of large-area tandem solar cells, fabricated on > 6-inch silicon bottom cells.

Research Area

Photovoltaic and renewable energy engineering

The student will work in a diverse, dynamic, and supportive research group of postdocs, PhD students, and other ToR students. You will learn from well-recognised experts in the field of luminescence imaging. You will have access to a wide range of optical and electronic components allowing you to be implement your creative imagination when needed.

You, with the support of the supervisors, will develop a unique method for a rapid and reliable spatial quantification of sub-cells implied open-circuit voltage and series resistance in tandem solar cells. A journal publication is expected from your effort in this project, demonstrating the developed method on working devices. You will be equipped with knowledge and hands-on skills in modification and upgrading a home-built photoluminescence imaging setup. You will learn or improve your coding skills using programming software (Matlab or Python). All of these will prepare you for postgraduate studies in the same research area or different area, as well as non-academic jobs.