کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1809672 | 1525207 | 2014 | 4 صفحه PDF | دانلود رایگان |
An AlGaN-based front illuminated intrinsically solar-blind ultraviolet four-quadrant Schottky detector was fabricated and characterized. A layered ohmic structure was deposited followed by a multi-step annealing method. Ultraviolet transmissive iridium oxide was used as the Schottky barrier material and formed by a two-step annealing method. Au contacts were deposited on the Schottky contacts and annealed. The detector was mounted onto a commercial chip carrier and wires were epoxy bonded from the ohmic and Au contacts to the carrier strips. The detector had an average ideality factor of 1.97±0.08, a Schottky barrier height of (1.22±0.07) eV, a reverse leakage current density of (2.1±4) nA/cm2, a series resistance of (120±30)Ω and a free carrier concentration of (1.6±0.3)×1018cm−3. Spectral characterization on the photosensitive area of 7.3×10−3cm2 yielded a cut-off wavelength at (275±5)nm (4.59 eV to 4.23 eV) for each quadrant, corresponding to the absorption edge of a (46±3)% Al content AlGaN-based material. The detector had an average responsivity of (28±2) mA/W and a quantum efficiency of (14±1)% at 250 nm. The ultraviolet-to-visible and near-infrared rejection ratio was between 103 and 105 for most of the quadrants. Characterization showed uniformity across the quadrants, proving the detector feasible for implementation in future ultraviolet-sensitive electro-optic devices.
Journal: Physica B: Condensed Matter - Volume 439, 15 April 2014, Pages 93–96