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In this paper, we have designed and investigated the performance of radialGaAs/AlGaAs pin junction nanocone array solar cells by performing coupledoptoelectronic simulations to obtain the most optimal design configurationbased on its photovoltaic properties. Each model has been compared with itsGaAs shell counterparts for different levels of surface passivations. It hasbeen observed that the nanocones with the AlGaAs shell has a much betterperformance compared to those having GaAs shell. AlGaAs shell acts as a strongbarrier restricting most of the photogeneration to the inner GaAs regions andit also acts as a strong passivation layer, reducing the recombination lossesdue to surface effects. Further, it is observed that the nanocones achievetheir highest photoconversion efficiency when they are sparsely packed, with aconstant i-shell thickness of 7-9 nm and have an angle of tilt of 5 degrees.This enhanced performance is attributed to a more effective and extendedphotogeneration throughout the nanowire length, a strong overlapping built-inelectric field, and lower recombination losses.

Optimization of pin GaAs/AlGaAs Heterojunction Nanocone Array Solar Cell based on its Photovoltaic Properties