کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1813044 1025628 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication of ZnO nanorod array-based photodetector with high sensitivity to ultraviolet
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Fabrication of ZnO nanorod array-based photodetector with high sensitivity to ultraviolet
چکیده انگلیسی

Large scale densely packed and vertically oriented ZnO nanorod arrays were grown on F-doped SnO2 (FTO) substrates through a simple hydrothermal synthesis route. Based on the arrays of hexagonal ZnO nanorod with size of 60∼100 nm in diameter, and ∼1.5 μm in length, a prototypical photoelectrical device was fabricated for ultraviolet detection, showing good reproducibility and a large photocurrent of around 6.71 mA at the applied voltage of 0.4 V. The large photocurrent and the ohmic I–V characteristics of the ZnO nanorods under the illumination could be ascribed to the decrease of the barrier height among the ZnO nanorods and the Schottky barrier between the nanorods and the Au electrodes and, in particular, to the accumulation of conduction electrons, resulted from the neutralization between photogenerated holes and negatively charged oxygen ions. The photoresponse curve is well fitted to an exponential curve with the relaxation time constant of 9 s in rising edge and 90 s in decaying one, representing the accumulation of conduction electrons. These well-aligned ZnO nanostructures of high quality could be easily fabricated by a cost-effective chemical route and used for constructing nanoscale devices with excellent performances.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 404, Issue 21, 15 November 2009, Pages 4282–4285
نویسندگان
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