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학술지 Colorful Solar Cells Utilizing Off-axis Light Diffraction via Transparent Nanograting Structures
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저자
조대형, 홍성훈, 이우정, 김주연, 정용덕
발행일
202102
출처
Nano Energy, v.80, pp.1-10
ISSN
2211-2855
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.nanoen.2020.105550
협약과제
20JB1900, 무독성 버퍼층을 갖는 다색 플렉서블 박막 태양전지 기술 개발, 정용덕
초록
Various colors are implemented in solar cells without optical losses using light diffractions via grating structure. By utilizing the property of diffraction angle variations depending on the diffraction order, wavelength, grating period, and incident angle, many vivid colors are realized at different observation angles. Well-defined grating structures with periods of 770 nm and 1400 nm are uniformly fabricated on Cu(In,Ga)Se2 thin-film solar cells by a nanotransfer lithography using ZnO nanoparticles. Color-to-angle sensitivity, color brightness, and diffraction efficiency depend on the grating period and incident angle. A wide range of colors, mainly resulting from the 1st-order diffraction are observed in the range of observation angles within 20째. The solar cell performances hardly degrade due to the negligible optical transmission loss in the nanograting structure. The grating applied solar cells show additional advantages: short-circuit current gains in oblique incident light and a self-cleaning effect due to the enhanced hydrophobicity. Through this study, the photovoltaic modules are expected to not only remain as electricity generators, but also become aesthetic structures that can provide aesthetic pleasure to people.
키워드
CIGS solar cells, Colorful solar cells, Light diffractions, ZnO nanogratings
KSP 제안 키워드
Angle sensitivity, CIGS solar cell, Diffraction order, Grating period, Incident angle, Light diffraction, Oblique incident light, Optical loss, Optical transmission loss, Photovoltaic module(PV), Self-cleaning effect