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Journal Article Bifacial Color Realization for a-Si:H Solar Cells using Transparent Multilayered Electrodes
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Authors
Ga Young Kim, Lim Jungwook, 신명균, Sun Jin Yun
Issue Date
201801
Source
Solar Energy, v.159, pp.465-474
ISSN
0038-092X
Publisher
Elsevier
DOI
https://dx.doi.org/10.1016/j.solener.2017.11.019
Project Code
16PB6700, Development of fully transparent bifacial and multi-colored solar cells based on silicon thin-film with 8.5 % efficiency and 20 % transmittance , Lim Jungwook
Abstract
Transparent hydrogenated amorphous silicon (a-Si:H) thin-film solar cells, in which the colors of the front and rear faces can be adjusted individually, were developed for implementation in building-integrated photovoltaic (BIPV) windows. The proposed ultrathin transparent multilayered electrodes (TMEs) are highly conductive and transparent, consisting of a bottom layer of gallium-doped zinc oxide (GZO), a thin metal layer of Ag, and an optoelectronic controlling layer (OCL) of GZO. They can be used for both the front and rear electrodes of transparent a-Si:H solar cells, and the resulting solar cells show a 5.0% average power conversion efficiency and 18.3% average transmittance. The various dual colors on the front and rear of the cell can be individually adjusted by changing the thickness of the OCL on each face of the TME, without significantly changing the efficiency. The cell colors were quantitatively investigated using the color coordinates in a chromaticity diagram based on the International Commission on Illumination (CIE; 1931) standard to show that the simulated and observed colors match well under both LED and fluorescent light sources. We also show that the observable color of the BIPV windows is determined by indoor and outdoor light sources, and dynamically varies as a function of illuminance of the light source as the day gradually progresses into night. This study helps to elucidate the color behavior of the BIPV windows and to develop a-Si:H BIPV windows that show various colors with stable electrical power generation.
KSP Keywords
Average Power, Building-integrated photovoltaics, Chromaticity diagram, Conversion efficiency(C.E.), Electrical power generation, Fluorescent Light, Gallium doped zinc oxide(GZO), Light source, Thin film solar cells, Various colors, Zinc oxide(ZnO)