Effect of core quantum-dot size on power-conversion-efficiency for silicon solar-cells implementing energy-down-shift using CdSe/ZnS core/shell quantum dots
- Title
- Effect of core quantum-dot size on power-conversion-efficiency for silicon solar-cells implementing energy-down-shift using CdSe/ZnS core/shell quantum dots
- Other Titles
- ZnS core
- Author
- 박재근
- Keywords
- SPECTRAL CONVERTERS; NANOCRYSTAL; COMPOSITES; ARRAY
- Issue Date
- 2014-08
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, 2014, 6(21), p.12524-12531
- Abstract
- Silicon solar cells mainly absorb visible light, although the sun emits ultraviolet (UV), visible, and infrared light. Because the surface reflectance of a textured surface with SiNX film on a silicon solar cell in the UV wavelength region (250-450 nm) is higher than similar to 27%, silicon solar-cells cannot effectively convert UV light into photo-voltaic power. We implemented the concept of energy-down-shift using CdSe/ZnS core/shell quantum-dots (QDs) on p-type silicon solar-cells to absorb more UV light. CdSe/ZnS core/shell QDs demonstrated clear evidence of energy-down-shift, which absorbed UV light and emitted green-light photoluminescence signals at a wavelength of 542 nm. The implementation of 0.2 wt% (8.8 nm QDs layer) green-light emitting CdSe/ZnS core/shell QDs reduced the surface reflectance of the textured surface with SiNX film on a silicon solar-cell from 27% to 15% and enhanced the external quantum efficiency (EQE) of silicon solar-cells to around 30% in the UV wavelength region, thereby enhancing the power conversion efficiency (PCE) for p-type silicon solar-cells by 5.5%.
- URI
- http://pubs.rsc.org/en/Content/ArticleLanding/2014/NR/C4NR02472A#!divAbstracthttp://hdl.handle.net/20.500.11754/47193
- ISSN
- 2040-3364; 2040-3372
- DOI
- 10.1039/c4nr02472a
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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