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Role of ytterbium-erbium co-doped gadolinium molybdate (Gd_2(MoO_4)_3:Yb/Er) nanophosphors in solar cells
- Source :
- Optics Express. 24:A1276
- Publication Year :
- 2016
- Publisher :
- The Optical Society, 2016.
-
Abstract
- Insufficient harvest of solar light energy is one of the obstacles for current photovoltaic devices to achieve high performance. Especially, conventional organic/inorganic hybrid solar cells (HSCs) based on PTB7 as p-type semiconductor can only utilize 400-800 nm solar spectrum. One effective strategy to overcome this obstacle is the introduction of up-conversion nanophosphors (NPs), in the virtue of utilizing the near infrared region (NIR) of solar radiation. Up-conversion can convert low-energy photons to high-energy ones through multi-photon processes, by which the solar spectrum is tailored to well match the absorptive domain of the absorber. Herein we incorporate erbium-ytterbium co-doped gadolinium molybdate (Gd2(MoO4)3, GMO), denoted as GMO:Yb/Er, into TiO2 acceptor film in HSCs to enhance the light harvest. Here Er3+ acts as activator while Yb-MoO4 2- is the joint sensitizer. Facts proved that the GMO:Yb/Er single crystal NPs are capable of turning NIR photons to visible photons that can be easily captured by PTB7. Studies on time-resolved photoluminescence demonstrate that electron transfer rate at the interface increases sharply from 0.65 to 1.42 × 109 s−1. As a result, the photoelectric conversion efficiency of the GMO:Yb/Er doped TiO2/PTB7 HSCs reach 3.67%, which is increased by around 25% compared to their neat PTB7/TiO2 counterparts (2.94%). This work may open a hopeful way to take the advantage of those conversional rare-earth ion doped oxides that function in tailoring solar light spectrum for optoelectronic applications.
- Subjects :
- Ytterbium
Materials science
Photoluminescence
business.industry
Photovoltaic system
Doping
chemistry.chemical_element
02 engineering and technology
Hybrid solar cell
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Acceptor
Atomic and Molecular Physics, and Optics
0104 chemical sciences
Erbium
Semiconductor
Optics
chemistry
Optoelectronics
0210 nano-technology
business
Subjects
Details
- ISSN :
- 10944087
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Optics Express
- Accession number :
- edsair.doi...........99e994728c5890493e81bccc75beb250