Integration of Self-Assembled Porous Alumina and Distributed Bragg Reflector for Light Trapping in Si Photovoltaic Devices
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Author(s)
Sheng, Xing
Liu, Jifeng
Coronel, Naomi
Agarwal, Anuradha Murthy
Michel, Jurgen
Kimerling, Lionel C.
Date Issued
September 2010
Journal
IEEE Photonics Technology Letters
Publisher
Institute of Electrical and Electronics Engineers
Citation
Xing Sheng et al. “Integration of Self-Assembled Porous Alumina and Distributed Bragg Reflector for Light Trapping in Si Photovoltaic Devices.” Photonics Technology Letters, IEEE 22.18 (2010) : 1394-1396. © Copyright 2010 IEEE
Version
Final published version
Abstract
Light trapping is an important issue for thin film silicon photovoltaic cells due to the limited absorption coefficient for near infrared light. In this letter, we present a photonic structure that combines porous anodic aluminum oxide with a distributed Bragg reflector (DBR) on the backside of Si cells for light trapping. Simulation results show that this low-cost, self-assembled structure can provide more than 50% relative efficiency enhancement for a 2 μm thin film crystalline Si solar cell, as compared to a reference cell without any back structure. As a proof of concept, we incorporated the backside structure into thick silicon wafers. The enhancement of light absorption near the band edge of silicon is demonstrated for our proposed light-trapping structure, in agreement with the theoretical predictions.
MIT Department
MIT Materials Research Laboratory
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1109/LPT.2010.2060717
