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In this work, in order to enhance the light absorption in one micron thick crystalline silicon solar cells, a back reflecting and rear located plasmonic nanodisk scheme is proposed. We investigate the scattering properties of aluminum nanostructures located at the back side and optimize them for enhancing absorption in the silicon layer by using finite difference time domain simulations. The results indicate that the period and diameters of nanodisks, thickness of spacer layer have a strong impact on short circuit current enhancements. The optimized Al nanoparticle arrays embedded in rear located SiO2 layer enhance J sc with an increase of 47% from the non-plasmonic case of 18.9 to 27.8 mA/cm2 when comparing with a typical stack with a planar aluminum back reflector and a back reflector with plasmonic nanoparticles. This finding could lead to improved light trapping within a thin silicon solar cell device.

Graphene planar silicon heterojunction solar cells were investigated using 2D physics-based TCAD simulation. A planar structure consisting of graphene layer as the hole transport material, and n-type silicon as substrate is simulated. Process modeling has been carried out especially for highly boron diffusion. Using this model, the effect of the highly doped surface inverse region located as 0.08, 0.22, 0.35 μm on the photovoltaic performance has been studied. The obtained J–V characteristic is analyzed to study effects of the inverse region depth and doping concentration on Schottky junction modification. The proposed design proves to be highly efficient in 0.2 h annealing, which provides a new platform to further enhance the performance of graphene planar solar cell.