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Design of novel TiO2–SiO2 core–shell helical nanostructured anti-reflective coatings on Cu(In,Ga)Se2 solar cells with enhanced power conversion efficiency.
- Source :
- Journal of Materials Chemistry A; 5/14/2019, Vol. 7 Issue 18, p11452-11459, 8p
- Publication Year :
- 2019
-
Abstract
- Introducing an anti-reflective coating (ARC) is the last step of fabricating Cu(In,Ga)Se<subscript>2</subscript> solar cells with enhanced photo-generated current by reducing the reflectance of visible light. The use of nanostructures in ARC has been intensively investigated because this can prolong the optical path length by a scattering effect or by the formation of a refractive index gradient. Herein, we proposed the use of TiO<subscript>2</subscript> helical nanostructures using glancing angle deposition (GLAD), and then synthesized SiO<subscript>2</subscript> surrounding the helical nanostructures to further decrease the reflectance by producing a refractive index gradient. The optimized values of TiO<subscript>2</subscript> and SiO<subscript>2</subscript> thicknesses are 150 nm and 3 nm determined by the finite-difference time-domain (FDTD) simulation on Cu(In,Ga)Se<subscript>2</subscript> solar cells. The suppression of reflectance led to enhanced light absorption across a broad wavelength range, and boosted the J<subscript>SC</subscript> from 20.66 to 22.51 mA cm<superscript>−2</superscript>, resulting in improved power conversion efficiency (PCE) from 6.32 to 7.00% after applying the TiO<subscript>2</subscript>–SiO<subscript>2</subscript> core–shell nanostructures as the ARC. This 10.75% PCE enhancement suggests that the novel TiO<subscript>2</subscript>–SiO<subscript>2</subscript> core–shell nanostructures have great potential as ARC for Cu(In,Ga)Se<subscript>2</subscript> solar cells, and it would be beneficial for development in the photovoltaic field in both research and applications. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 7
- Issue :
- 18
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 136338888
- Full Text :
- https://doi.org/10.1039/c9ta01960j