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Enhanced efficiency and current density of solar cells via energy-down-shift having energy-tuning-effect of highly UV-light-harvesting Mn2+-doped quantum dots

Title
Enhanced efficiency and current density of solar cells via energy-down-shift having energy-tuning-effect of highly UV-light-harvesting Mn2+-doped quantum dots
Author
박재근
Keywords
Mn-doped quantum dots; Down-conversion; Quantum yield; Monocrystalline silicon; CdZnS/ZnS QDs; Colloidal synthesis
Issue Date
2017-01
Publisher
ELSEVIER SCIENCE BV
Citation
NANO ENERGY, v. 33, page. 257-265
Abstract
Enhancing the efficiency of solar cells via quantum dots (QDs) as an energy-down-shift (EDS) layer is a new approach to utilize the wasted energy in the ultra-violet (UV)-light, but the smaller Stokes shift in QDs leads towards partial self-re-absorption losses among QDs due to which the overall enhancement is limited. Here, Mn2+-doped Cd0.5Zn0.5S/ZnS core/shell QDs were deposited as an EDS with a higher Stokes shift on the front surface of monocrystalline p-type silicon (mc-p-Si) solar cells through straightforward and cost-effective spincoating technique. The Mn2+: Cd0.5Zn0.5S/ZnS QDs confirmed a typical EDS (2.76-4.96 eV. 2.13 eV), which absorb UV light in the range of 250-450 nm and emit visible yellow-orange light at 583 nm. Application of these QDs into the mc-p-Si solar cells clearly exhibited a larger Stokes shift (> 200 nm), generated through a functional energy tuning effect (ETE) of Mn2+ dopant. Through this EDS having an ETE (EDS/ETE) QDs, a remarkable enhancement of the external-quantum-efficiency (EQE) in the UV region was observed. The EQE was improved by similar to 22.5% in the wavelength range of 300-450 nm and the short-circuit-current-density was enhanced about 1.42 mA/cm(2) (+4.02%), which are the highest records reported so far. In particular, the powerconversion- efficiency was improved by similar to 3.22%, compared to its reference value recorded in the absence of an EDS/ETE QD layer. These results suggested that the Mn2+-doped QDs played a significant role in improving the efficiency and current density of solar cells.
URI
http://www.sciencedirect.com/science/article/pii/S2211285517300551http://repository.hanyang.ac.kr/handle/20.500.11754/105682
ISSN
2211-2855; 2211-3282
DOI
10.1016/j.nanoen.2017.01.048
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ELECTRONIC ENGINEERING(융합전자공학부) > Articles
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