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Proceedings Paper

Hybrid multi-junction silicon solar cell simulation
Author(s): Robert S. LaFleur; Ronald A. Coutu
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Paper Abstract

Photon absorption is a primary cause of limited solar cell performance. A proposed solution is investigated in this paper through modeling and simulation of a hybrid multi-junction silicon (HMJ-Si) solar cell. HMJ-Si cells, which are stacked silicon solar cells with an insulating air gap between them, were designed with front and rear metal grating geometries that exploit interference patterns for enhanced light management. Interference patterns were investigated in MATLAB® by using the Rayleigh-Sommerfeld formula to model 31 distinct wavelengths from 800-1100nm. Also incorporated in the model were plane wave tilts from -0.005 to 0.005 radians to account for the maximum angle of light subtended by the sun. The exploration of various grating geometries showed that contact widths of 400μm spaced 900μm apart provided an optimal destructive interference pattern while maintaining a 69.2% throughput. This contact grating was selected for finite-difference time-domain (FDTD) analysis using Lumerical® FDTD Solutions. The resulting far-field projection verified that the destructive interference pattern reaches the bottom cell with negligible fringing effects. Further analysis of the data led to a nominal bottom cell front contact width of 200μm spaced 1100μm apart.

Paper Details

Date Published: 16 March 2015
PDF: 6 pages
Proc. SPIE 9358, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV, 935817 (16 March 2015); doi: 10.1117/12.2076029
Show Author Affiliations
Robert S. LaFleur, Air Force Institute of Technology (United States)
Ronald A. Coutu, Air Force Institute of Technology (United States)

Published in SPIE Proceedings Vol. 9358:
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices IV
Alexandre Freundlich; Jean-François Guillemoles; Masakazu Sugiyama, Editor(s)

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