Electron and Hole Traps in GaN p-i-n Photodetectors Grown by Reactive Molecular Beam Epitaxy
Document Type
Article
Publication Date
2000
Abstract
GaN p-i-n photodetectors grown on sapphire by reactive molecular beam epitaxy have been characterized by measurements of room-temperature current-voltage (I-V), temperature-dependent capacitance (C-V-T), and deep level transient spectroscopy (DLTS) under both majority and minority carrier injection. Due to what we believe to be threading dislocations, the reverse I-V curves of p-i-n photodetectors show typical electric-field enhanced soft breakdown characteristics. A carrier freeze-out due to the de-ionization of Mg-related deep accepters has been found by C-V-T measurements. Three electron traps, B (0.61 eV), D (0.23 eV), and E-1 (0.25 eV) and one hole trap, H-3 (0.79 eV) have been revealed by DLTS measurements. The photodetectors with lower leakage currents usually show higher responsivity and lower trap densities of D and E-1.
Repository Citation
Fang, Z.,
Look, D. C.,
Lu, C.,
& Morkoç, H.
(2000). Electron and Hole Traps in GaN p-i-n Photodetectors Grown by Reactive Molecular Beam Epitaxy. Journal of Electronic Materials, 29 (9), L19-L23.
https://corescholar.libraries.wright.edu/physics/391
DOI
10.1007/s11664-004-0274-8
