Evaluation of the photo-generated carrier density of GaAs solar cells by using electrical and optical biased electroreflectance spectroscopy

Title
Evaluation of the photo-generated carrier density of GaAs solar cells by using electrical and optical biased electroreflectance spectroscopy
Author(s)
김종수소모근조현준한임식이상준[이상준]노삼규[노삼규]임재영[임재영]
Keywords
PHOTOREFLECTANCE
Issue Date
201508
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.67, no.4, pp.723 - 727
Abstract
In this work, to investigate the optical and the electrical properties of GaAs solar cells, we adopted optical/electrical biased electroreflectance spectroscopy (ER) and current-voltage (J-V) measurements. The p-n junction's electric fields were evaluated through an analysis of the Franz-Keldysh oscillations (FKOs) in the ER spectra. By comparing the electrical and the optical biased ER and optical biased J-V results, we calculated the carrier densities contributing to the photovoltage (sigma (pv) ) and the photocurrent (sigma (J)). We confirmed that the sigma pv could affect the field screening for the p-n junction's electric field. With increasing number of incident photons (sigma (ph) ), the ratio of sigma (pv) to sigma J was almost constant. From these results, for a concentrated photovoltaic device, we propose that the photovoltaic effect can affect the solar cell's efficiency in the relatively high excitation intensity region.
URI
http://hdl.handle.net/YU.REPOSITORY/31384http://dx.doi.org/10.3938/jkps.67.723
ISSN
0374-4884
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이과대학 > 물리학과 > Articles
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