DESIGN AND FABRICATION OF NITRIDE-BASED SOLAR CELLS AND INTEGRATION FOR TANDEM CELL

Abstract : The integration of hybrid opto-electronics consists of assembling several devices, fabricated separately using different and potentially non-compatible processes, onto one common platform to achieve a functional heterogeneous system. This concept can be applied for cost-effective and high performance III-Nitride (III-N) based solar cell applications. InGaN alloys exhibit many favorable photovoltaic properties such as broadband absorption with a tunable bandgap (0.7 eV - 3.4 eV), superior radiation resistance, large absorption coefficients and high saturation velocities. Theoretically, efficiency greater than 40% can be achieved by a multi-junction solar cell composed of four InGaN sub-cells with different In content. However, so far the large lattice mismatch between InN and GaN makes it experimentally difficult to grow good-quality, high In-composition InGaN films and currently impedes the realization of an all InGaN multi-junction solar cell. Thus, a practical use of III-N solar cells could be their combination with mature Si and GaAs based solar cell technologies. In this thesis, we have made significant progress toward developing these hybrid devices by developing a transfer method for InGaN solar cells. We demonstrate wafer-scale Van der Waal epitaxy and fabrication of InGaN-based solar cells on 2D h-BN, the mechanical release of the devices, thanks to the Van der Waal bonded layered h-BN, and their transfer on glass on dielectric mirror as back-side reflector with device results and enhanced performance. The dielectric mirror transmits wavelength above 500 nm allowing the operation of InGaN/Si tandem solar cell for example.
Keywords : Nitride
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Taha Ayari. DESIGN AND FABRICATION OF NITRIDE-BASED SOLAR CELLS AND INTEGRATION FOR TANDEM CELL. Engineering Sciences [physics]. École Doctorale de génie électrique et informatique, 2018. English. ⟨tel-02433285⟩

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