Optimizing the vertical position of quantum dots and wells to maximize light absorption

1 August 2021 Optimizing the vertical position of quantum dots and wells to maximize light absorption

Maxime Giteau, Yusuke Oteki, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, Yoshitaka Okada

Proceedings Volume 11824, New Concepts in Solar and Thermal Radiation Conversion IV; 1182406 (2021) https://doi.org/10.1117/12.2593862
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

Quantum-dot solar cells are a promising high-efficiency concept, but suffer from low absorption. Resonant light trapping can enable to absorb most of the incident light while maintaining good device quality. In this paradigm, the absorption depends critically on the vertical position of the quantum dot layers, but this has been largely ignored so far (this also applies to quantum wells). Here, we show the importance of the position of 10 InAs layers in a GaAs Fabry-Perot cavity. We then extend this approach to multi-resonant absorption, showing the potential absorption gain from optimizing the position of quantum dots in full devices.

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Maxime Giteau, Yusuke Oteki, Kento Kitahara, Naoya Miyashita, Ryo Tamaki, and Yoshitaka Okada "Optimizing the vertical position of quantum dots and wells to maximize light absorption", Proc. SPIE 11824, New Concepts in Solar and Thermal Radiation Conversion IV, 1182406 (1 August 2021); https://doi.org/10.1117/12.2593862

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KEYWORDS

Absorption

Quantum dots

Solar cells

Nanostructures

Quantum wells

Fabry–Perot interferometers

Gallium arsenide

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