| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系 === 103 === The tunable bandgap of Cu2(Fe1-xCox)SnS4 nanocrystals synthesized at 260℃ for 30 min by the hot-injection method was explored as a function of the Co concentration. The direct bandgaps of Cu2(Fe1-xCox)SnS4 nanocrystals can be tuned in the range of 1.30-1.46 eV, which decrease almost linearly with the Co concentration, showing that Cu2(Fe1-xCox)SnS4 nanocrystals may be well suited for application as the absorption layer in thermoelectric and photovoltaic devices.
Cu2MnSnS4 (CMTS) was synthesized at 270℃ for 0.5 h by the hot-injection method and at 270℃ for 48-96 h in a one-pot system respectively. The major phase in the samples synthesized by the hot-injection method was possibly an intermediate phase of orthorhombic Cu3SnS4 (CTS) and tetragonal CMTS. For the one-pot method, the intermediate phase and CMTS were formed in the samples synthesized at 270℃ for 48 h, while prolonging the synthesis time to 96 h produced single CMTS phase in the samples. The bandgap of tetragonal CMTS is about 1.62-1.66 eV.
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