Solar Cell characterisation by Photoluminescence
Susanne Siebentritt a
a University of Luxembourg, Avenue de la Faiencerie, 162, Luxembourg, Luxembourg
Online School
Proceedings of Online School on Fundamentals of Emerging Solar Cells (PVSCHOOL)
Online, Spain, 2021 February 10th - 12th
Organizers: Bruno Ehrler, Thomas Kirchartz and Elizabeth von Hauff
Invited Speaker, Susanne Siebentritt, presentation 003
DOI: https://doi.org/10.29363/nanoge.pv school.2021.003
Publication date: 29th January 2021

Thin film solar cells are complex structures consisting of several layers and their interfaces. To achieve good efficiencies all the single parts must be optimised. In the complete solar cell it is often difficult to know if the absorber is the problem or the contact layers. Photoluminescence (PL) spectroscopy on the absorber alone can help to identify the properties of the absorber without finishing the whole solar cell. With intensity calibrated PL we can determine the internal voltage of the absorber, i.e. the quasi-Fermi level splitting. It is limited by non-radiative recombination through deep defects or tail states. Both can be characterised by PL spectroscopy. The difference between quasi-Fermi level splitting and open circuit voltage is an indication about losses at interfaces and in contact layers.

By measuring the PL intensity as a function of the excitation intensity, we can predict the diode factor of the absorber itself. The diode factor has a significant influence on the fill factor of the solar cell and thus the efficiency.

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