Reference : Bulk and surface recombination properties in thin film semiconductors with different ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Bulk and surface recombination properties in thin film semiconductors with different surface treatments from timeresolved photoluminescence measurements
Weiss, Thomas* mailto [University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) >]
Bissig, Benjamin* mailto []
Feurer, Thomas mailto []
Carron, Romain mailto []
Buecheler, Stephan mailto []
Tiwari, Ayodhya mailto []
* These authors have contributed equally to this work.
Scientific Reports
Nature Publishing Group
Yes (verified by ORBilu)
United Kingdom
[en] The knowledge of minority carrier lifetime of a semiconductor is important for the assessment of its quality and design of electronic devices. Time-resolved photoluminescence (TRPL) measurements offer the possibility to extract effective lifetimes in the nanosecond range. However, it is difficult to discriminate between surface and bulk recombination and consequently the bulk properties of the semiconductor cannot be estimated reliably. Here we present an approach to constrain systematically the bulk and surface recombination parameters in semiconducting layers and reduces to finding the roots of a mathematical function. This method disentangles the bulk and surface recombination based on TRPL decay times of samples with different surface preparations. The technique is exemplarily applied to a CuInSe2 and a back-graded Cu(In,Ga)Se2 compound semiconductor, and upper and lower bounds for the recombination parameters and the mobility are obtained. Sets of calculated parameters are extracted and used as input for simulations of photoluminescence transients, yielding a good match to experimental data and validating the effectiveness of the methodology. A script for the simulation of TRPL transients is provided.
Swiss State Secretary for Education, Research and Innovation ; Swiss National Science Foundation
H2020 ; 641004 - Sharc25 - Super high efficiency Cu(In,Ga)Se2 thin-film solar cells approaching 25%

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