Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 20, Pages 18018-18025Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am504866g
Keywords
upconversion; dye-sensitized solar cells; energy relay; nanoparticles; near-infrared
Funding
- Swedish Energy Agency [32076-1]
- Natural Science Foundation of China [51102066]
- Program for Basic Research Excellent Talents in Harbin Institute of Technology [BRETIII 2012018]
- US NSF [DMR-1104994]
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The efficiency of most photovoltaic devices is severely limited by near-infrared (NIR) transmission losses. To alleviate this limitation, a new type of colloidal upconversion nanoparticles (UCNPs), hexagonal core-shell-structured beta-NaYbF4:Er3+(2%)/NaYF4:Nd3+(30%), is developed and explored in this work as an NIR energy relay material for dye-sensitized solar cells (DSSCs). These UCNPs are able to harvest light energy in multiple NIR regions, and subsequently convert the absorbed energy into visible light where the DSSCs strongly absorb. The NIR-insensitive DSSCs show compelling photocurrent increases through binary upconversion under NIR light illumination either at 785 or 980 nm, substantiating efficient energy relay by these UCNPs. The overall conversion efficiency of the DSSCs was improved with the introduction of UCNPs under simulated AM 1.5 solar irradiation.
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