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Molybdenum disulfide is due to electrical and optical properties, MoS2 can replace silicon and even graphene in the next generation nanoelectronics devices and represents new opportunities for flexible electronics. Quantum dots cadmium telluride CdTe is the most consistent for research together with MoS2 due to its high photo stability and long photoluminescence decay time.
In this work, we performed luminescence of two mixtures with different concentrations of MoS2 and CdTe quantum dots by excitation with a diode laser at room temperature. The wavelength of the laser is 405 nm, and its power is 200 mV. The first solution was a dilution of MoS2 and CdTe in a ratio of 1: 1, the second - MoS2 and CdTe in a ratio of 1: 2. Two peaks were be observed in the obtained luminescence spectra. From the analysis of the spectra, we that the first maximum is observed ~ 1.8 eV due to radiation transitions in MoS2. the high-energy band with a maximum of about 2.1 eV is due to electronic transitions in CdTe. It turned out that the shape of the spectral dependence of photoluminescence is determined by the component composition of the mixture. Namely, as the MoS2 content increases, the photoluminescence bands shift toward lower quantum energies due to the coupling of two-dimensional MoS2 states and the CdTe quantum dot.
| Topics | Session A. Physics of condensed matter and spectroscopy |
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