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- 저자 : Lecheng Tian (검색결과 2 건)
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Synthesis of the wheat-like CdSe/CdTe thin film heterojunction and their photovoltaic applications
Lecheng Tian,Haibin Yang,Juan Ding,Qian Li,Yannan Mu,Yuhang Zhang 한국물리학회 2014 Current Applied Physics Vol.14 No.6
We report on the fabrication of wheat-like CdSe/CdTe thin film heterojunction solar cells made using a simple electrochemical deposition method and close-spaced sublimation technology on indium tin oxide (ITO) substrates. Structural, optical, and electrical properties of the wheat-like CdSe/CdTe thin film junctions were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), energy dispersive spectrometry (EDS), ultravioletevisible (UVevis) absorption spectrum and Keithley 2400 analysis. A significant red-shift of the absorption edge is observed in this heterojunction. The heterostructure is composed of the wheat-like CdSe array and CdTe thin film, showing optical properties typical of type II heterostructures that are suited for photovoltaic applications. A photocurrent density of 8.34 mA/cm2 has been obtained under visible light illumination of 100 mW/cm2. This study demonstrates that the electrochemical deposition and the close-spaced sublimation technology, which are easily adapted to other chemical systems, are promising techniques for large-scale fabrication of lowcost heterojunction solar cells.
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Xiaofa Su,Yan Qi,Baozhu Shi,Yanqun Lv,Lecheng Tian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.08
The CuInS2 quantum dots sensitization of TiO2 nanonails (NNs) array was successfully carried out by a successive ionic layer absorption and reaction (SILAR) method using CuCl2 · 2H2O, InCl3 · 4H2O and Na2S · 9H2O as precursors. The morphology, elemental composition and crystalline structure of the CuInS2 quantum dots sensitized TiO2 NNs array heterojunction nanostructures were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and X-ray-photoelectron spectroscopy (XPS). The above characterization results could unanimously reveal that the nanoparticles successfully loaded on the TiO2 NNs array can be assigned as CuInS2 quantum dots. UV-Vis absorption measurements indicated that the CuInS2 quantum dots sensitization extended the visible light absorption. The largest short-circuit photocurrent density of 17.7 mA/cm2 was obtained, which indicated that the CuInS2 was a promising material in activating visible light functionalities and enhancing photoelectrochemical performance.
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