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Title: The effect of Cu-Zn disorder on charge carrier mobility and lifetime in Cu2ZnSnSe4

Abstract

Cu-Zn disorder is one possible origin for the limited efficiencies of kesterite solar cells and its impact on the band gap and band tails have been intensively studied. However, the effect on charge transport and recombination, which are key properties for solar cells, has not been investigated so far. Therefore, we probe the impact of the Cu-Zn order on charge carrier mobility and lifetime. To this end, we change the Cu-Zn order of a co-evaporated Cu2ZnSnSe4 thin film by sequential annealing and probe the impact by time-resolved terahertz spectroscopy. Aside from of the well-known band gap shift, we find no significant change in mobility and lifetime with Cu-Zn order. This finding indicates that Cu-Zn disorder is not limiting efficiencies of kesterite solar cells at their current status by means of charge carrier recombination and transport.

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1478185
Report Number(s):
NREL/JA-5K00-72609
Journal ID: ISSN 0040-6090
DOE Contract Number:  
AC36-08GO28308
Resource Type:
Journal Article
Journal Name:
Thin Solid Films
Additional Journal Information:
Journal Volume: 666; Journal Issue: C; Journal ID: ISSN 0040-6090
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 36 MATERIALS SCIENCE; kesterite; disorder; mobility; lifetime; terahertz spectroscopy; solar cell

Citation Formats

Hempel, Hannes, Eichberger, Rainer, Repins, Ingrid, and Unold, Thomas. The effect of Cu-Zn disorder on charge carrier mobility and lifetime in Cu2ZnSnSe4. United States: N. p., 2018. Web. doi:10.1016/j.tsf.2018.09.027.
Hempel, Hannes, Eichberger, Rainer, Repins, Ingrid, & Unold, Thomas. The effect of Cu-Zn disorder on charge carrier mobility and lifetime in Cu2ZnSnSe4. United States. doi:10.1016/j.tsf.2018.09.027.
Hempel, Hannes, Eichberger, Rainer, Repins, Ingrid, and Unold, Thomas. Thu . "The effect of Cu-Zn disorder on charge carrier mobility and lifetime in Cu2ZnSnSe4". United States. doi:10.1016/j.tsf.2018.09.027.
@article{osti_1478185,
title = {The effect of Cu-Zn disorder on charge carrier mobility and lifetime in Cu2ZnSnSe4},
author = {Hempel, Hannes and Eichberger, Rainer and Repins, Ingrid and Unold, Thomas},
abstractNote = {Cu-Zn disorder is one possible origin for the limited efficiencies of kesterite solar cells and its impact on the band gap and band tails have been intensively studied. However, the effect on charge transport and recombination, which are key properties for solar cells, has not been investigated so far. Therefore, we probe the impact of the Cu-Zn order on charge carrier mobility and lifetime. To this end, we change the Cu-Zn order of a co-evaporated Cu2ZnSnSe4 thin film by sequential annealing and probe the impact by time-resolved terahertz spectroscopy. Aside from of the well-known band gap shift, we find no significant change in mobility and lifetime with Cu-Zn order. This finding indicates that Cu-Zn disorder is not limiting efficiencies of kesterite solar cells at their current status by means of charge carrier recombination and transport.},
doi = {10.1016/j.tsf.2018.09.027},
journal = {Thin Solid Films},
issn = {0040-6090},
number = C,
volume = 666,
place = {United States},
year = {2018},
month = {11}
}