Near‐Infrared Light‐Induced Photocurrent from a (NaYF4:Yb‐Tm)/(Cu2O) Composite Thin Film |
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| Authors: | Hong Jia Shu Hong Zheng Cheng Xu Wei Bo Chen Jue Chen Wang Xiao Feng Liu Jian Rong Qiu |
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| Institution: | 1. State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou, Zhejiang, P. R. China;2. State Key Laboratory of Luminescent Materials and Devices, South China University of technology, Guangzhou, China |
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| Abstract: | 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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| Keywords: | electrodeposition up‐conversion photoactive current photovoltaic devices thin films |
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