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• W2890928848 abstract "Abstract 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." @default.
• W2890928848 created "2018-09-27" @default.
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• W2890928848 date "2018-09-27" @default.
• W2890928848 modified "2023-10-01" @default.
• W2890928848 title "Minority and Majority Charge Carrier Mobility in Cu2ZnSnSe4 revealed by Terahertz Spectroscopy" @default.
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• W2890928848 doi "https://doi.org/10.1038/s41598-018-32695-6" @default.
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