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<p>In solar cells, <i>p</i>–<i>n</i> junctions are considered highly promising structures for enhancing carrier collection and, consequently, conversion efficiency. The fundamental processes in solar cell operation involve the generation of electron–hole pairs, their separation, and recombination in external circuits. The critical step in this process is the separation of the electron–hole pairs. The internal piezopotential, which is formed in the crystal under stress and is known as the piezo-phototronic effect, directly influences the separation and recombination processes, thus affecting the solar cell efficiency. Recently, detailed models incorporating the piezo-phototronic effect have been proposed to simulate metal/semiconductor and <i>p</i>–<i>n</i> junctions based on ZnO, using COMSOL, which randomly assigns values to the forces applied to these structures. In this study, we present a comprehensive analysis, beginning with an in-depth mechanical simulation to identify the possible force values that can be applied without compromising the structural integrity of our nanowire. This is followed by a complete analytical model to investigate the piezo-phototronic effect on the electrical and photovoltaic characteristics of a solar cell. We also examine how different geometric parameters affect the potential generated in the solar cell. By leveraging the piezoelectric effect induced by external stress, our study provides a complete and realistic understanding of the piezo-phototronic effect on the photovoltaic characteristics of inorganic solar cells, contributing to the design of more efficient solar cells.</p>

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Numerical Investigation of Piezoelectric Potential of Nanowire for Solar Energy Harvesting Using InGaN

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Sahar Ammar,
  • Rabeb Belghouthi,
  • Nejiba Aoun,
  • Mounir Ben El Hadj Rhouma,
  • Michel Aillerie

摘要

In solar cells, p–n junctions are considered highly promising structures for enhancing carrier collection and, consequently, conversion efficiency. The fundamental processes in solar cell operation involve the generation of electron–hole pairs, their separation, and recombination in external circuits. The critical step in this process is the separation of the electron–hole pairs. The internal piezopotential, which is formed in the crystal under stress and is known as the piezo-phototronic effect, directly influences the separation and recombination processes, thus affecting the solar cell efficiency. Recently, detailed models incorporating the piezo-phototronic effect have been proposed to simulate metal/semiconductor and p–n junctions based on ZnO, using COMSOL, which randomly assigns values to the forces applied to these structures. In this study, we present a comprehensive analysis, beginning with an in-depth mechanical simulation to identify the possible force values that can be applied without compromising the structural integrity of our nanowire. This is followed by a complete analytical model to investigate the piezo-phototronic effect on the electrical and photovoltaic characteristics of a solar cell. We also examine how different geometric parameters affect the potential generated in the solar cell. By leveraging the piezoelectric effect induced by external stress, our study provides a complete and realistic understanding of the piezo-phototronic effect on the photovoltaic characteristics of inorganic solar cells, contributing to the design of more efficient solar cells.