Minority and Majority Charge Carrier Mobility in Cu2ZnSnSe4 revealed by Terahertz Spectroscopy

Minority and Majority Charge Carrier Mobility in Cu2ZnSnSe4 revealed by Terahertz Spectroscopy

The mobilities of electrons and holes determine the applicability of any semiconductor, but their individual measurement remains a major challenge. Here, we show that time-resolved terahertz spectroscopy (TRTS) can distinguish the mobilities of minority and majority charge carriers independently of...

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Veröffentlicht in:Scientific reports 2018-09, Vol.8 (1), p.1-9, Article 14476
Hauptverfasser: Hempel, Hannes, Hages, Charles J., Eichberger, Rainer, Repins, Ingrid, Unold, Thomas
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CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
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MATERIALS SCIENCE
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multidisciplinary
Photovoltaics
Recombination
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Thin films
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creator Hempel, Hannes
Hages, Charles J.
Eichberger, Rainer
Repins, Ingrid
Unold, Thomas
description The mobilities of electrons and holes determine the applicability of any semiconductor, but their individual measurement remains a major challenge. Here, we show that time-resolved terahertz spectroscopy (TRTS) can distinguish the mobilities of minority and majority charge carriers independently of the doping-type and without electrical contacts. To this end, we combine the well-established determination of the sum of electron and hole mobilities from photo-induced THz absorption spectra with mobility-dependent ambipolar modeling of TRTS transients. The method is demonstrated on a polycrystalline Cu 2 ZnSnSe 4 thin film and reveals a minority (electron) mobility of 128 cm 2 /V-s and a majority (hole) carrier mobility of 7 cm 2 /V-s in the vertical transport direction relevant for light emitting, photovoltaic and solar water splitting devices. Additionally, the TRTS analysis yields an effective bulk carrier lifetime of 4.4 ns, a surface recombination velocity of 6 * 10 4  cm/s and a doping concentration of ca. 10 16 cm −3 , thus offering the potential for contactless screen novel optoelectronic materials.
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subjects 639/301/119/995
639/301/930/12
639/624/1107/527
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CZTS
Humanities and Social Sciences
kesterite
MATERIALS SCIENCE
Mobility
multidisciplinary
Photovoltaics
Recombination
Science
Science (multidisciplinary)
Spectroscopy
Spectrum analysis
terahertz
Thin films
title Minority and Majority Charge Carrier Mobility in Cu2ZnSnSe4 revealed by Terahertz Spectroscopy
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