NDLI: A 53% high efficiency GaAs vertically integrated multi-junction laser power converter

Content Provider	IEEE Xplore Digital Library
Author	Sudharsanan, R. Krut, D. Isshiki, T. Cotal, H. Mesropian, S. Masalykin, A. Karam, N.H.
Copyright Year	2008
Description	Author affiliation: Spectrolab Inc., Sylmar, CA (Sudharsanan, R.; Krut, D.; Isshiki, T.; Cotal, H.; Mesropian, S.; Masalykin, A.; Karam, N.H.)
Abstract	Summary form only given. Power-by-light schemes to provide electrical power to remote opto-electronic modules typically involve the use of multi-segmented photovoltaic (PV) cells or commonly known as laser power converters (LPC) illuminated by an optical fiber to produce output voltages between 2 and 12 volts, with up to several hundred milliwatts of electrical power. Typically these photovoltaic devices are based on a GaAs single junction cell grown on semi-insulating GaAs substrates and they are further segmented and connected in series depending on the output voltage required. Theoretically, these cells should have efficiencies near 60% but currently these cells have efficiencies only in the range of 40 to 45%. Optical losses due to high grid metal coverage and cell isolation trench can reduce efficiency by nearly 10%. In order to eliminate the losses in the multi-segmented cells and to improve the efficiencies further we have designed a vertical multi junction device. The vertical multi-junction approach has several advantages over the multi- segmented approach. The advantages are; a) reduction in optical losses due to trench formation, b) lower metal obscuration losses, due to lower current density in the device, c) reduction of sheet conduction losses, and d) simple process to fabricate the devices. We have successfully designed and fabricated a new vertical multi-junction TV laser power converter with an efficiency of over 53%, a considerably higher efficiency than the regular multi-segmented 2V GaAs laser power converter and this is the highest efficiency reported so far for a photovoltaic device.
Starting Page	30
Ending Page	30
File Size	172135
Page Count	1
File Format	PDF
ISBN	9781424419319
DOI	10.1109/LEOS.2008.4688472
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-09
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gallium arsenide Power lasers Optical losses Photovoltaic systems Solar power generation Fiber lasers Voltage Linear predictive coding Optical fibers Optical devices
Content Type	Text
Resource Type	Article

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