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UV-Curable Polymer-QD Flexible Films as the Downconversion Layer for Improved Performance of Cu(In,Ga)Se2Solar Cells

UV-Curable Polymer-QD Flexible Films as the Downconversion Layer for Improved Performance of Cu(In,Ga)Se2Solar Cells
Nazim, MohammedKim, ByungwooLee, SangwookMin, Byoung KounKim, Jae Hyun
DGIST Authors
Kim, Jae Hyun
Issued Date
Article Type
Graphene quantum dotsLayered semiconductorsLightNanocomposite filmsAdhesivesUltra-violet lightUltraviolet curableUV curable polymerQuantum efficiencyCopper compoundsCuringGallium compoundsGrapheneNanocrystalsPhotonsPolymer filmsSemiconductor quantum dotsSolar cellsThin filmsExternal quantum efficiencyFunctionalized grapheneHigh energy photonsLow energy photonsRelative performance
The downconversion process effectively traps high-energy photons of ultraviolet light and converts them into low-energy photons for utilization in solar cells. In this work, transparent, highly emissive, ultraviolet (UV)-curable nitrogen-functionalized graphene quantum dot-dispersed Norland Optical Adhesive (NOA) nanocomposite (herein denoted as poly-QD film) flexible films were applied as luminescent downconversion (LDC) layers to boost the efficiency of copper indium gallium selenide solar cells. The N-graphene quantum dots (GQDs) were embedded into clear, colorless UV-curable NOA polymer matrices via the clickreaction of thiol-ene components under UV light at room temperature. The best poly-QD film showed a high emission peak of >500 nm and improved external quantum efficiency in the high-energy solar spectrum, resulting in the highest efficiency of ∼9.70% (compared to 8.77% for bare cells), which triggered an ∼10.60% relative performance increment compared to bare copper indium gallium selenide (CIGS) solar cells. Hence, the overall CIGS solar cell performance enhancement caused mainly by Jsc improvement of ∼9.06% (relative enhancement) due to efficient trapping of short-wavelength photons. As-prepared poly-QD films were applied as LDC layers, which significantly boost quantum efficiency in short-wavelength spectra. © 2020 American Chemical Society.
American Chemical Society
Related Researcher
  • 김재현 Kim, Jae Hyun 에너지융합연구부
  • Research Interests 에너지; 배터리; 고체전해질; 태양전지; 전기차; 리튬이온배터리
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Division of Energy Technology 1. Journal Articles


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