Evaluation of the Junction's Electric Field and the Ideality Factor of GaAs p-n junction Solar Cells by Using Photoreflectance Spectroscopy

Title
Evaluation of the Junction's Electric Field and the Ideality Factor of GaAs p-n junction Solar Cells by Using Photoreflectance Spectroscopy
Author(s)
김종수손창원한임식리얀패트릭스미스Noh, Sam Kyu[Noh, Sam Kyu]Choi, Hyonkwang[Choi, Hyonkwang]Leem, Jae-Young[Leem, Jae-Young]
Keywords
FRANZ-KELDYSH OSCILLATIONS; QUANTUM DOTS; WELL
Issue Date
201404
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.64, no.7, pp.1031 - 1035
Abstract
We investigated the optical and the electrical properties of GaAs solar cells (SCs) by using photoreflectance (PR) spectroscopy and current-voltage (J-V) measurements. The electric fields (F-j) in p-n junctions were evaluated through an analysis of the Franz-Keldysh oscillations (FKOs) of the PR spectra. From the excitation light intensity (I-ex) dependence of the PR, we found that the photovoltaic effect resulted in a reduction of the F-j. The F-j was gradually reduced by up to 37% from the dark built-in electric field when the I-ex was increased (I-ex = 2.3 similar to 181 mW/cm(2)). We evaluated the ideality factor (n) of the SC via PR spectroscopy, and the results matched the results of the J-V measurements well. From these results, we demonstrate that the F-j and the n of the SCs can be evaluated by using PR spectroscopy.
URI
http://hdl.handle.net/YU.REPOSITORY/32550http://dx.doi.org/10.3938/jkps.64.1031
ISSN
0374-4884
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이과대학 > 물리학과 > Articles
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