Photoluminescence assessment of materials for solar cell absorbers

• DOI: 10.1039/d2fd00057a
• Publication Date: 2022-06-09T12:01:25Z
• Authors: Susanne Siebentritt; Uwe Rau; Sevan Gharabeiki; Thomas P. Weiss; Aubin Prot; Taowen Wang; Damilola Adeleye; Marwan Drahem; Ajay Singh
• Keywords: Open-circuit voltage

Absolute photoluminescence measurements present a tool to predict the quality of photovoltaic absorber materials before finishing solar cells. Quasi Fermi level splitting predicts maximal open circuit voltage. However, various methods extract quasi are plagued by systematic errors in range 10-20 meV. It is important differentiate between radiative loss and shift emission maximum. They not same when using maximum as "radiative" band gap from efficiency, 10 40 meV too low for typical broadening spectrum. efficiency presents an ideal compare different without determining splitting. For comparison with voltage, fit high energy slope generalised Planck's law gives more reliable results if fitted temperature, i.e. part, close actual measurement temperature. Generalised also allows extraction non-absolute absorptance spectrum, which enables absorption edge. We discuss indications they negligible not.