Understanding carrier dynamics in CuInZnS3 quantum dots toward high-performance indoor photovoltaics

CuInZnS3 quantum dots (CIZS QDs) is a non-toxic and phosphide free material which has a significant potential to be used in wearable PVs and indoor PVs [1,2]. However, due to its emission properties apparently dominated by defects, its carrier dynamics are more complicated than binary metal chalcogenides and are not yet well understood. For instance, the origin of the light emission broadening is still unclear, with mechanism of poly-disperse size distribution and sub-bandgap states. The investigation of carrier dynamics in the ensemble, and within single dot emission spectroscopy not only can help us to understand the challenge of PL spectra broadening but also can provide deep insight regarding the band structures and carrier dynamics within this quaternary compound semiconductor QDs.

In this project, the student will be trained in synthesising CIZS QDs through continuous flow or heterogeneous [3] synthesis approach which are considered as the most promising techniques for fabrication large-scale colloidal QDs. Moreover, we will use the state-of-the-art laser micro-spectroscopy and ultrafast optical spectroscopy setups [4] to investigate the emission line-shape [5] and carrier dynamics of ensembles and single dots.

The student will also develop experimental skills and knowledge in optics & lasers by using femtosecond lasers systems and a complex optical setup, develop skills in programming by adapting the software to control the experiment, and perform data analysis and modelling using the knowledge on the physical processes involved.

For more information, or if there are any questions, please contact Professor Wolfgang Langbein LangbeinWW@cardiff.ac.uk

The typical academic requirement is a minimum of a 2:1 physics and astronomy or a relevant discipline. 

Applicants whose first language is not English are normally expected to meet the minimum University requirements (e.g. IELTS 6.5 Overall with 5.5 minimum in sub-scores) (https://www.cardiff.ac.uk/study/international/english-language-requirements) 

How to apply 

Applicants should apply to the Doctor of Philosophy in Physics and Astronomy. 

Applicants should submit an application for postgraduate study via the Cardiff University webpages (https://www.cardiff.ac.uk/study/postgraduate/research/programmes/programme/physics-and-astronomy) including: 

• your academic CV 

• Your degree certificates and transcripts to date including certified translations if these are not in English 

• a personal statement/covering letter 

• two references, at least one of which should be academic. Your references can be emailed by the referee to physics-admissions@cardiff.ac.uk  

Please note: We are do not contact referees directly for references for each applicant due to the volume of applications we receive.     

In the "Research Proposal" section of your application, please specify the project title and supervisors of this project.

In the funding section, please select that you will be self-funded or include your own sponsorship or scholarship details.

Once your application is submitted, we will review it and advise you within a few weeks if you have been shortlisted for an interview.