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Proceedings Paper

Quantum well and quantum dot energy harvesting devices
Author(s): Roger E. Welser; Ashok K. Sood; Oleg A. Laboutin; Louis J. Guido; Nibir K. Dhar; Priyalal S. Wijewarnasuriya
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Paper Abstract

Quantum structured solar cells seek to harness a wide spectrum of photons at high voltages by embedding low energy-gap wells or dots within a high energy-gap matrix. Quantum well and quantum dot solar cells have the potential to deliver ultra-high power conversion efficiencies in single junction devices, efficiencies that in theory can approach 45% in un-concentrated sunlight over a wide range of environmental conditions. In this paper, we will briefly review the theoretical underpinnings of quantum well and quantum dot photovoltaic devices, and summarize recent experimental efforts developing quantum-structured solar cell devices. In a specific example, test devices utilizing radiation-hard, III-V nitride materials have been built using both bulk and multiple quantum well (MQW) structures. Photovoltaic devices with an InGaN MQW structure are shown to outperform devices employing a thicker, bulk InGaN layer. These results, along with the underlying theoretical foundations, suggest that quantum well and quantum dot structures can enhance the performance of photovoltaic devices for a variety of defense applications.

Paper Details

Date Published: 17 May 2011
PDF: 8 pages
Proc. SPIE 8035, Energy Harvesting and Storage: Materials, Devices, and Applications II, 80351C (17 May 2011); doi: 10.1117/12.888128
Show Author Affiliations
Roger E. Welser, Magnolia Optical Technologies, Inc. (United States)
Magnolia Solar, Inc. (United States)
Ashok K. Sood, Magnolia Optical Technologies, Inc. (United States)
Magnolia Solar, Inc. (United States)
Oleg A. Laboutin, Kopin Corp. (United States)
Louis J. Guido, Virginia Polytechnic Institute and State Univ. (United States)
Nibir K. Dhar, Defense Advanced Research Projects Agency (United States)
Priyalal S. Wijewarnasuriya, U.S. Army Research Lab. (United States)


Published in SPIE Proceedings Vol. 8035:
Energy Harvesting and Storage: Materials, Devices, and Applications II
Nibir K. Dhar; Priyalal S. Wijewarnasuriya; Achyut K. Dutta, Editor(s)

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