AlxGa1-xN/GaN p-i-n UV sensors grown by metal organic chemical vapor deposition (MOCVD) were fabricated for the UV-B (280-320 nm) detection. With a proper structure design by including a thin top p-layer and a graded AlxGa1-xN (x = 0.26 → 0.13) layer, the etching pit density (EPD) and the specific contact resistance of top p-layer can be significantly decreased. Device dark current density decreased from 3.5 × 10-7 to 2.49 × 10-11 A/cm2 at -3V and the spectrum responsivity at 310 nm UV-B range is 0.04 A/W, which is much better than traditional AlGaN-based devices without graded layer design.
|Number of pages||5|
|Journal||Materials Science and Engineering B: Solid-State Materials for Advanced Technology|
|State||Published - 25 Sep 2005|
- UV sensor