Fabrication of the (Y<inf>2</inf>O<inf>3</inf>:Yb-Er)/Bi<inf>2</inf>S<inf>3</inf> composite film for near-infrared photoresponse
- Publication Type:
- Journal Article
- Journal of Materials Chemistry A, 2015, 3 (11), pp. 5917 - 5922
- Issue Date:
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© The Royal Society of Chemistry 2015. Harvest of near infrared (NIR) radiation in photovoltaic devices is highly desirable as it is recognized as a potential pathway to break the Shockley-Queisser limit of solar conversion efficiency. Here, (Y
2O 3:Yb-Er)/Bi 2S 3 composite films with photoactive current generation under NIR light excitation were fabricated by electro-deposition and a simple successive ionic layer adsorption and reaction (SILAR) method. The composite films consist of homogeneous crystalline particles of Y 2O 3 with a lamellar morphology covered by Bi 2S 3 nanoparticles. Upon excitation by a 980 nm laser, the Y 2O 3:Yb-Er layer in the composite film converts NIR photons into visible emissions through upconversion, which is absorbed by the covered Bi 2S 3 nanoparticles and leads to the generation of photoelectrons. With the use of a standard electrochemical cell where the composite film serves as the photoanode, we demonstrate robust photocurrent generation in aqueous solution. This study suggests a promising strategy for the harvesting of NIR radiation in solar cells, photocatalysts, and infrared photo-detectors.
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