Optical Design of ZnO-based Antireflective Layers for Enhanced GaAs Solar Cell Performance

Title
Optical Design of ZnO-based Antireflective Layers for Enhanced GaAs Solar Cell Performance
Authors
이혜진Jae Won LeeHee Jun KimDae Han JungKi Suk Lee김상현금대명Chang Zoo Kim최원준Jeong Min Baik
Issue Date
2015-12
Publisher
Physical chemistry chemical physics : PCCP
Abstract
A series of hierarchical ZnO-based antireflection coatings with different nanostructures (nanowires and nanosheets) is prepared hydrothermally, followed by means of RF sputtering of MgF2 layers for coaxial nanostructures. Structural analysis showed that both ZnO had a highly preferred orientation along the h0001i direction with a highly crystalline MgF2 shell coated uniformly. However, a small amount of Al was present in nanosheets, originating from Al diffusion from the Al seed layer, resulting in an increase of the optical bandgap. Compared with the nanosheet-based antireflection coatings, the nanowirebased ones exhibited a significantly lower reflectance (B2%) in ultraviolet and visible light wavelength regions. In particular, they showed perfect light absorption at wavelength less than approximately 400 nm. However, a GaAs single junction solar cell with nanosheet-based antireflection coatings showed the largest enhancement (43.9%) in power conversion efficiency. These results show that the increase of the optical bandgap of the nanosheets by the incorporation of Al atoms allows more photons enter the active region of the solar cell, improving the performance.
URI
http://pubs.kist.re.kr/handle/201004/58425
ISSN
14639076
Appears in Collections:
KIST Publication > Article
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