Photoluminescence characterization of Cu2Sn1-xGexS3 bulk single crystals
作者： Naoya Aihara , Kunihiko Tanaka
DOI: 10.1063/1.5050033
关键词: Analytical chemistry 、 Photoluminescence 、 Exciton 、 Band gap 、 Recombination 、 Alloy 、 Germanium 、 Excitation 、 Materials science 、 Luminescence
摘要: Cu2Sn1-xGexS3 (CTGS) which is composed of earth-abundant and non-toxic elements a promising material for the absorber layer thin-film solar cells. In this study, optical properties CTGS bulk single crystals with varying germanium content were investigated by temperature excitation power dependent photoluminescence (PL) measurements. At low-temperature, excitons broad defect-related bands observed in PL spectra from all samples. These indicate blue-shift an increase content, suggested formation solid-solutions CTGS. The band was dominated donor-acceptor pair (DAP) recombination luminescence. DAP due to transition carriers between shallow acceptors relatively deep donors any alloy composition. Band-to-band (BB) luminescence also samples at room temperature. gap energies varied 0.933 1.544 eV determined spectral fitting BB bands. addition, small bowing parameter b, ca. 0.1 determined, indicates that energy can be controlled almost linearly Therefore, optimum single-junction cells achieved control composition.Cu2Sn1-xGexS3 ...
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