期刊
ADVANCED ENERGY MATERIALS
卷 5, 期 2, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201401041
关键词
electrodeposition; up-conversion; photoactive current; photovoltaic devices; thin films
类别
资金
- National Natural Science Foundation of China [51132004, 51072054, 51102209]
- National Basic Research Program of China [2011CB808100]
Utilization of photons of sub-bandgap energy, mostly near-infrared (NIR) photons, is highly desirable for photovoltaic devices. We show that (NaYF4:Yb-Tm)/(Cu2O) composite films formed by electrodeposition exhibit robust photoactive current generation under NIR light excitation. The composite films consist of homogeneous crystalline particles of the fluoride and Cu2O in sub-micrometer size. From spectroscopic characterization, it is found that the NaYF4:Yb-Tm layer in the composite film converts NIR radiation by up-conversion into visible emission, which is efficiently absorbed by the covering semiconducting Cu2O film, producing photoelectrons. Accordingly, the composite films exhibit highly photoactive current generation by means of a photoelectrochemical process driven by NIR irradiation. The methodology demonstrated here may have certain implications for the utilization of NIR radiation in solar cells, photocatalysts, and infrared photodetectors.
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