Background: Energy is a major concern in every aspect of our life. Solar energy is a renewable environment friendly source of energy. Therefore, solar cells are vastly studied with different technology and with different material. Objective: The main objective here is to analyze InGaN material for solar cell applications with less complicated structures of MQW solar cells on revising solar cell with the recombination structure, I-V characteristics and its efficiency. Methods: The device is simulated using SILVACO ATLAS where the well and the barrier layers are inserted in the depletion region employing material combination of InGaN / GaN which increases the solar cell performance parameter. This work focuses on the photogeneration rate, recombination in the active region as well as its current voltage relation from the simulation. Results: With the increase in the number of QW periods in the active region of the device, the photovoltaic parameters especially conversion efficiency increases significantly. Under space AM0 solar illumination, the cell efficiency increases up to 8.2 % for 20 MQWs with 20% Indium content for the InGaN/GaN structure. It enhances the external quantum efficiency (EQE) upto 36% at nearly 380nm wavelength range near the UV region. Conclusion: The modelled structure is efficiently simulated using TCAD SILVACO ATLAS, and the material Indium Gallium Nitride semiconductor shows an excellent solar cell performance with high solar radiation. It is also observed that with increase in the number of well periods the solar cell performance increases which demonstrates the feasibility of Indium Gallium Nitride solar cell with additional MQW period as power source.

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This work presents the optimized model and results of numerical simulations and analysis of CNT based GaAs/InAs multiple quantum wells (from 5 to 70 QWs) GaAs solar cell. These QWs is found to extend the absorption edge beyond that of the GaAs bandgap. Further, with the introduction of the wide bandgap InGaP back surface field (BSF) layer in the model, efficiency is enhanced due to the reflection of unabsorbed photons from the bottom of the device back into the quantum well. The proposed model uses a heterogeneous CNT layer as top semi-transparent electrode. It is observed that this CNT top layer with lower sheet resistance and better light transmission can significantly improve the overall efficiency. Our optimized cell with 35 number 25nm quantum well structure with 100 nm CNT top layer with sheet resistance of 128 Ω/□ is found to increase the efficiency up to 34.12% (with CNT top layer) from 32.46%(without CNT top layer). EQE of the cell is nearly 90%. To show the accuracy of our findings, the key phases of the numerical modelling are presented, and the base simulation data are checked using standard experimental data. An essential step towards creating commercially viable QWSCs is the effective application of the suggested CNT-based QWSC model within a modern TCAD tool environment (Silvaco ATLAS).

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