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Kwon, Tae-Hyuk
Energy Recognition
Research Interests
  • Energy transfer, organic solar cells, supercapacitor, ultrasonic spray chemistry, dithienothiophene, iridium complexes, phosphorescent bioapplications

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Phosphorescent Energy Downshifting for Diminishing Surface Recombination in Silicon Nanowire Solar Cells

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Title
Phosphorescent Energy Downshifting for Diminishing Surface Recombination in Silicon Nanowire Solar Cells
Author
Kim, Hyun-TakLee, KangminJin, WonjooUm, Han-DonLee, MinsooHwang, EunhyeKwon, Tae-HyukSeo, Kwanyong
Issue Date
2018-11
Publisher
NATURE PUBLISHING GROUP
Citation
SCIENTIFIC REPORTS, v.8, pp.16974
Abstract
Molecularly engineered Ir(III) complexes can transfer energy from short-wavelength photons (lambda < 450 nm) to photons of longer wavelength (lambda > 500 nm), which can enhance the otherwise low internal quantum efficiency (IQE) of crystalline Si (c-Si) nanowire solar cells (NWSCs) in the shortwavelength region. Herein, we demonstrate a phosphorescent energy downshifting system using Ir(III) complexes at short wavelengths (300-450 nm) to diminish the severe surface recombination that occurs in c-Si NWSCs. The developed Ir(III) complexes can be considered promising energy converters because they exhibit superior intrinsic properties such as a high quantum yield, a large Stokes shift, a long exciton diffusion length in crystalline film, and a reproducible synthetic procedure. Using the developed 1011) complexes, highly crystalline energy downshifting layers were fabricated by ultrasonic spray deposition to enhance the photoluminescence efficiency by increasing the radiative decay. With the optimized energy downshifting layer, our 1cm(2) c-Si NWSCs with Ir(III) complexes exhibited a higher IQE value for short-wavelength light (300-450 nm) compared with that of bare Si NWSCs without Ir(III) complexes, resulting in a notable increase in the short-circuit current density (from 34.4 mA.cm(-2) to 36.5 mA.cm(-2) ).
URI
https://scholarworks.unist.ac.kr/handle/201301/25503
URL
https://www.nature.com/articles/s41598-018-35356-w
DOI
10.1038/s41598-018-35356-w
ISSN
2045-2322
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