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Abstract: We purpose a hybrid energy harvester made of silicon solar cell, piezoelectric and thermoelectric. Our simulations are carried out using the COMSOL software. For this purpose, MEMS, heat transfer and electromagnetic modules were used. We connected nine piezoelectric, one thermoelectric and one solar cell modules in series to maximize the harvested energy and provide the appropriate voltage level. It is observed that the maximum electric current and voltage is about 200mA and 5V, respectively, which is equivalent to approximately 1W. The total obtained energy was amplified by two DC/DC converters and the voltage level increased to 5V. Also, we theoretically proved that the use of an optical window (as top and bottom contact layers) based on photonic multilayer can control surface reflection. It is found that if we use two contact layers in the front and back of the solar cell, the transmittance increases from 33% (without contact layer) to 67% (with double contact layer).

In this paper, we explore the linear response of one dimensionalquasiperiodic structure based on Fibonacci sequence composed of silicon dioxide,polystyrene and graphene materials. Here, a graphene monolayer is sandwichedbetween two adjacent layers. The numerical results are obtained by using the standardtransfer matrix method. Due to the presence of graphene sheet in each structure, in theinitial range of THz, an additional gap GPBG is induced which is absent in the case ofwithout graphene. The amplitude of absorption peaks at the upper edge of the GPBGsignificantly enhances, when damping factor increases. The height of the absorptionpeak at the GPBG edge goes up as the temperature increases. At the GPBG edge, withincreasing the thickness of graphene, the absorption peak rises and shifts to the lowerfrequencies. Moreover, we have realized that the amplitude of absorption peaks at theupper edge of the GPBG significantly enhance by increasing damping factor.