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Impact of light management on photovoltaic characteristics of GaAs solar cells with photonic crystals and quasi-photonic crystals
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Paper Abstract

In detailed balance model, the efficiency of single-junction solar cells can be potentially as high as 33.5% under AM 1.5G illumination. However the best state-of-the-art devices are still far lower than those figures, even the electronic quality is nearly perfect. Therefore the efficiency gap should stem from the light management inside solar cells. Recently, external radiation efficiency (ηext) derived from detailed balance model is emphasized to evaluate light management and photon recycling, which aggregates the loss of backward emission into substrate and non-radiative recombination. This factor can be highly relevant to the cell’s performance, especially open-circuit voltage (Voc), and maximizing Voc is generally considered as the last mile to approach ultra-high efficiency limit. In this work, we try to quantify the Voc enhancement in GaAs solar cells by enhancing light extraction. The simulation tools are RCWA simulation and photon recycling model NREL developed recently. The top structures we simulate here are TiO2 cones arranged in three PC/QPC lattices. After our calculation, the QPC 12-folds symmetry can make the biggest Voc enhancement 11.21meV compared with bare one, and the structure also possess extraordinary omni-directional anti-reflection ability for maintaining high Jsc. Our results also show that using this way to enhance Voc is especially suitable for cells with ordinary material quality. Therefore, the requests of ideal top structures for solar cells’ use are not only near-perfect anti-reflection, but the ability to maximize light extraction if no feature of angular filter exists.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8981, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III, 89810F (7 March 2014); doi: 10.1117/12.2038889
Show Author Affiliations
Yi-Chun Lai, National Chiao Tung Univ. (Taiwan)
Tung-Ting Yang, National Chiao Tung Univ. (Taiwan)
Peichen Yu, National Chiao Tung Univ. (Taiwan)
Mu-Min Hung, National Chiao Tung Univ. (Taiwan)
Martin Charlton, Univ. of Southampton (United Kingdom)

Published in SPIE Proceedings Vol. 8981:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III
Alexandre Freundlich; Jean-François Guillemoles, Editor(s)

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