Characterization of PV materials and cells – basic checks for consistency
Thomas Unold a
a Helmholtz-Zentrum Berlin, Department Structure and Dynamics of Energy Materials, Berlin, Germany
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, Thomas Unold, presentation 004
DOI: school.2021.004
Publication date: 29th January 2021

Different methods can be used to characterize basic material and device properties of photovoltaic cells. Some methods have been developed specifically for a certain materials system, i.e. crystalline silicon pn-junctions, but are often also applied to other solar cells materials and structures, such as chalcopyrite, kesterite or halide perovskite-based cells.  To obtain meaningful results on a given object of study, the assumptions going into the different methods should be kept in mind and validated.  Also, the application of complementary methods is advantageous, as it allows for consistency checks for the conclusion to be drawn. In particular carrier lifetimes and doping densities play important (and different) roles for PV devices and are often difficult to be extracted from characterization of (non-ideal) materials and devices. This will be illustrated by comparing chalcopyrite and halide perovskite solar cells using complementary techniques such as (steady-state) photoluminescence quantum efficiency, transient spectroscopy, as well as admittance-based analysis.

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