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Using the transfer matrix approach, we investigate theoretically the absorbance, transmittance, and reflectance through one-dimensional CH 3 NH 3 PbI 3 perovskite-based photonic crystal at room temperature. In our proposed structure, a monolayer MoS 2 film is embedded between two CH 3 NH 3 PbI 3 layers. We found that, the presence of monolayer MoS 2 film increases the absorbance in longer wavelengths [Formula: see text] With increasing the number of periods, absorbance increases in most wavelengths of the incident light. It was shown that, by controlling the number of periods, the absorbance coefficient can be tuned according to the wavelength and angle of incident light. Furthermore, for incident light with longer wavelength, the absorbance, transmittance as well as reflectance versus thickness of the perovskite layer have an oscillatory behavior, and with increasing the number of periods this oscillatory behavior becomes more obvious and prominent. For the incident light in the infrared region, by increasing the number of periods the absorbance as opposed to the transmittance increases for different incidence angles. While, the reflectance coefficient first shows oscillatory behavior by increasing the number of periods, then with a further increase in the number of periods it reaches a constant value. The proposed structure can be useful for optoelectronic and optical devices. Such as improving the efficiency of solar cells based on the hybrid inorganic-organic perovskites and infrared sensor system., (© 2023. The Author(s).)

The effect of the strain on the spin and valley dependent transport properties, including the conductance and polarization, through a monolayer MoS 2 superlattice under Rashba spin-orbit coupling is theoretically investigated. It is found that the conductance strongly depends on the spin and valley degrees of freedom, and spin-inversion can be achieved by MoS 2 superlattice. Also, the spin and valley dependent conductance in a monolayer MoS 2 superlattice can be efficiently adjusted via strain and the number of the superlattice barriers. Moreover, it is demonstrated that both the magnitude and sign of the spin and valley polarization depend on the strain strength, the number of barriers, and electrostatic barrier height. Both full spin and valley polarized current (with 100% or - 100% efficiency) can be realized in a MoS 2 superlattice under strain., (© 2021. The Author(s).)