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

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 Cu₂ZnSnSe₄ thin film and reveals a minority (electron) mobility of 128 cm²/V-s and a majority (hole) carrier mobility of 7 cm²/V-s in the vertical trans

SUBMITTER: Hempel H 

PROVIDER: S-EPMC6160416 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature