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Efficiency enhancement of Cu(In,Ga)Se 2 thin film solar cells by employing onmi‐directional ZnO nanostructure with MgF 2 anti‐reflection‐coating layer
Author(s) -
Jo HeeJin,
Shim BoHyun
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31415
Subject(s) - nanorod , materials science , layer (electronics) , refractive index , coating , nanostructure , reflection (computer programming) , optoelectronics , anti reflective coating , fresnel equations , energy conversion efficiency , hydrothermal circulation , solar cell , optics , nanotechnology , chemical engineering , physics , computer science , engineering , programming language
An omni‐directional, graded‐index, and textured ZnO nanorods ( n = 1.7‐2.0) with MgF2 ( n = 1.37) antireflection (AR)‐coating layer for Cu(In,Ga)Se 2 solar cells grown by hydrothermal method are presented. We achieve that the graded index structure can reduce a weighted global reflectance of 5.5%, and significantly improve a current density (J SC ) of Cu(In,Ga)Se 2 solar cells up to 32.3 mA/cm 2 which is comparable to a general MgF 2 single layer AR coating. Optimized AR‐coating layer leads to decreasing Fresnel reflection by gradient refractive index between ZnO nanorods and air. According to our experiment results, ZnO nanostructure with MgF 2 AR‐coating layer can be used for various photovoltaic cells to enhance the light conversion efficiency.