Dye-sensitized solar cell (DSSC) coated with energy down shift layer of nitrogen-doped carbon quantum dots (N-CQDs) for enhanced current density and stability
- Authors
- Riaz, Rabia; Ali, Mumtaz; Maiyalagan, T.; Anjum, Aima Sameen; Lee, Seoyun; Ko, Min Jae; Jeong, Sung Hoon
- Issue Date
- Jul-2019
- Publisher
- ELSEVIER
- Keywords
- Nitrogen-doped carbon quantum dots; Energy-down shift; Photoluminescence; Facile synthesis; Dye-sensitized solar cells; Green emissive
- Citation
- APPLIED SURFACE SCIENCE, v.483, pp.425 - 431
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 483
- Start Page
- 425
- End Page
- 431
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/2893
- DOI
- 10.1016/j.apsusc.2019.03.236
- ISSN
- 0169-4332
- Abstract
- Utilizing ultraviolet light by using Energy Down Shift (EDS) of quantum dots is a recent approach to efficiently utilize a broader spectrum of light, for energy harvesting. Other than higher efficiency, EDS is highly promising for increasing the stability of Dye-Sensitized Solar cells (DSSC); as it decreases the UV degradation of the cell. Previously, heavy metals-based (Cadmium etc) quantum dots are used for the purpose, which are not only toxic but also have less stability and have complicated synthesis methods. To overcome these issues, a thin coating of green emissive Nitrogen-doped Carbon Quantum Dots (N-CQDs) on DSSC, as a stable and efficient EDS layer is proposed here. N-CQDs were synthesized by a scalable, green and facile one-pot hydrothermal pyrolysis of citric acid in presence of nitrogen source, with a production yield of 65%, and quantum yield of 70%. The readily dispersible and highly stable colloid of N-CQDs was coated on the device, and with an optimized thickness, the power conversion efficiency was increased by 10%. This increase was further confirmed by external quantum efficiency (EQE) test, i.e. N-CQDs coated device showed EQE enhancement majorly in the UV spectrum and enhanced stability in UV light was recorded. The transmittance of FTO-glass was increased due to EDS and it also has an antireflection effect, which intern produces a small increase in EQE in the visible spectrum.
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