Article Dans Une Revue Surfaces and Interfaces Année : 2025

Enhancing solar cell efficiency of AlxIn1-xN/Si heterojunctions using an a-Si buffer: A study of material, interface and device properties

Résumé

This study explores the impact of an optimized amorphous silicon (a-Si) buffer layer on Al x In 1-x N-on-Si(100) heterojunction solar cells, with Al content varying from 0% (InN) to 55%. The buffer layer improves the structural quality of the AlInN layer, as evidenced by reduced full width at half maximum values in X-ray diffraction rocking curves around the AlInN (0002) peak. Atomic force microscopy reveals that the buffer layer does not alter surface roughness. The effectiveness of the a-Si buffer is demonstrated by an enhancement of the conversion efficiency under AM1.5G illumination from 3.3 % to 3.9 % for devices with 35 % Al. Looking at the effect of the Al content in devices with the a-Si buffer, the device with 22% Al shows the best photovoltaic performance, with a conversion efficiency of 4.1 % and a V OC of 0.42 V, J SC of 15.4 mA/cm², and FF of 63.3%. However, performance declines for Al contents above 36% due to increased resistivity and reduced carrier concentration. These findings highlight the critical role of the novel a-Si buffer layer developed by RF-sputtering and the Al content in optimizing AlInN/Si heterojunction solar cell performance.

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hal-05227790 , version 1 (28-08-2025)

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M. Sun, R.G. Cornejo, M. de la Mata, S.I. Molina, Benjamin Damilano, et al.. Enhancing solar cell efficiency of AlxIn1-xN/Si heterojunctions using an a-Si buffer: A study of material, interface and device properties. Surfaces and Interfaces, 2025, 72, pp.107278. ⟨10.1016/j.surfin.2025.107278⟩. ⟨hal-05227790⟩
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