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Photoluminescence and defect evolution of nano-zno thin films at low temperature annealing

Science China(Technological Sciences) 2013年第1期56卷 25-31页

作者： YANG AiLing YANG Yun ZHANG ZhenZhen BAO XiChang YANG RenQiang LI ShunPin SUN Liang Department of Physics Ocean University of China Qingdao Institute of Bioenergy & Bioprocess Technology Chinese Academy of Sciences

nano-zno thin films composed of nanoparticles with sizes of 10-16 nm on silicon substrates at low temperature were prepared by sol-gel *** placing the nano-zno thin films at room temperature or annealing at 100°C in air for 10 h intermittently,within a total 70 h annealing time,the evolution of PL spectra of the nano-zno thin films were studied in *** the annealing time increases,the PL peaks shift from violet to blue and green *** PL peaks at violet and blue bands decrease with the annealing time,but the PL peaks at green band are *** PL spectra are related to the defects in the nano-zno thin *** PL peaks positioned at 430 nm are mainly related to defects of zinc interstatials(Zni),oxygen vacancies and(Vo);the ones at 420 nm to oxygen interstitials(Oi),Zinc vacancies(Vzn),Zni ;and the ones at 468 nm to Vzn,Zni,and charged oxygen interstatials(Vo+).The green luminescence is related to Oi,Vo and *** evolutions of PL spectra and the defects are also related to the concentrations of Zn in the thin films,the thicknesses of the films and the annealing *** the films with 0.5 M and 1.0 M Zn concentrations,after 20 h and 30 h annealing in air at 100°C,respectively,either placing them in air at room temperature or continuing anneal in air at 100°C,the PL spectra are *** the low temperature annealing,Zni decreases with the annealing time,and Oi *** Oi favors to keep the nano-zno thin films *** result is important to nano-zno thin films as electron transport layers in inverted or tandem organic solar cells.

关键词： nano-zno thin films low temperature annealing PL spectra defects

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Synthesis of zno films with a special texture and enhanced field emission properties

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Chinese Physics B 2011年第10期20卷 325-328页

作者：王小平王子王丽军梅翠玉 College of Science University of Shanghai for Science and Technology School of Transportation Engineering Tongji University

zno films with special textures ave fabricated on Mo-coated Al2O3 ceramic substrates by the catalyst-free electron beam evaporation method, and the as-deposited films are treated by hydrogen plasma. It is found that the surface morphologies of the films are changed significantly after hydrogen plasma treatment and that the films consist of vertically standing and intersecting nanosheets. A lower turn-on field of 1.2 V/μm and an enhanced current density -0.11 mA/cm2 at 2.47 V/μm are achieved. The low threshold field and the high emission current density are attributed primarily to the unique shape and smaller resistivity of the zno nanosheet films.

关键词： nano-zno thin films hydrogen plasma treatment field electron emission microwaveplasma chemical vapour deposition

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