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Crystals 2019, 9(3), 170; https://doi.org/10.3390/cryst9030170

Optical Characterization and Photovoltaic Performance Evaluation of GaAs p-i-n Solar Cells with Various Metal Grid Spacings

1
Department of Electronic Engineering, National Changhua University of Education, Changhua 500, Taiwan
2
Department of Electronic Engineering, Ming Chi University of Technology, Taipei 243, Taiwan
3
Department of Electronic Engineering, Hsiuping University of Science and Technology, Taichung 412, Taiwan
*
Author to whom correspondence should be addressed.
Received: 28 February 2019 / Revised: 16 March 2019 / Accepted: 19 March 2019 / Published: 22 March 2019
(This article belongs to the Special Issue III-V Heteroepitaxy for Solar Energy Conversion)
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Abstract

GaAs p-i-n solar cells are studied using electroreflectance (ER) spectroscopy, light beam induced current (LBIC) mapping and photovoltaic characterization. Using ER measurements, the electric field across the pn junction of a wafer can be evaluated, showing 167 kV/cm and 275 kV/cm in the built-in condition and at −3 V reverse bias, respectively. In order to understand the effect of the interval between metal grids on the device’s solar performance, we performed LBIC mapping and solar illumination on samples of different grid spacings. We found that the integrated photocurrent intensity of LBIC mapping shows a consistent trend with the solar performance of the devices with various metal grid spacings. For the wafer used in this study, the optimal grid spacing was found to be around 300 μm. Our results clearly show the importance of the metal grid pattern in achieving high-efficiency solar cells. View Full-Text
Keywords: photovoltaic; electroreflectance spectroscopy; Franz–Keldysh oscillations; light beam induced current photovoltaic; electroreflectance spectroscopy; Franz–Keldysh oscillations; light beam induced current
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Wu, J.-S.; Lin, D.-Y.; Li, Y.-G.; Hsu, H.-P.; Kao, M.-C.; Chen, H.-Z. Optical Characterization and Photovoltaic Performance Evaluation of GaAs p-i-n Solar Cells with Various Metal Grid Spacings. Crystals 2019, 9, 170.

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