کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1553564 1513226 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical characteristics and deep level traps study of Au/ZnO:H Schottky diodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Electrical characteristics and deep level traps study of Au/ZnO:H Schottky diodes
چکیده انگلیسی


• Current transport mechanisms-deep levels study of Au Schottky diodes on ZnO:H films.
• Thermionic emission in the 33.3% H2 diodes-lateral fluctuations of barrier height.
• Trap-assisted current transport mechanisms at the 0%, 20%, 50%, 66.6% H2 diodes.
• Two electron traps (0.29 and 0.21 eV) related to intrinsic defects.
• Higher trap concentrations near the surface and interaction of traps with H2.

The electrical characteristics and the deep level traps of Au Schottky contacts on ZnO:H films have been investigated by temperature-dependent current–voltage (I–V) and deep level transient spectroscopy (DLTS) measurements. The films were deposited with the DC-sputtering, varying the H flow rate in the Ar/H sputtering gas, so that the hydrogen per volume concentration [H2] was 0%, 20%, 33.3%, 50% and 66.6%. We found that for the Schottky diodes with [H2] = 33.3% thermionic emission is the dominant current transport process at low forward voltage, taking into consideration the lateral fluctuations of the barrier height described by a Gaussian distribution model. The domination of trap-assisted current transport mechanisms is possible in the diodes with [H2] = 0%, 20%, 50% and 66.6%. DLTS spectra revealed two electron traps, with activation energies of 0.29 and 0.21 eV, often observed in ZnO and related to intrinsic defects. The trap concentrations are significantly lower in the 33.3% H2 diodes compared to the 0% H2 ones, indicating an interaction of these traps with hydrogen.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Superlattices and Microstructures - Volume 75, November 2014, Pages 171–182
نویسندگان
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