Browsing by Author "HOUNG, MP"

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EFFECTS OF SB4/GA RATIOS ON THE ELECTRICAL-PROPERTIES OF GASB SCHOTTKY DIODES
(1992-03-15)
WANG, YH
;
HOUNG, MP
;
SZE, PW
;
CHEN, JF
;
CHO, AY
Au, Cu, Ag, and Al are deposited on Te-doped n-GaSb layers directly grown on lattice mismatched GaAs semi-insulating substrates. Sb4/Ga beam equivalent pressure ratios are found to profoundly influence the electrical properties of the Schottky diodes investigated here. The fact that both breakdown voltage and barrier height decrease with increasing Sb4/Ga ratios is attributed to the increase in surface state densities for samples grown at higher Sb4/Ga ratios. This suggestion is further confirmed by the model of surface state densities employing the relationship of barrier height to metal work function. The surface state densities are in the range of 2.3 x 10(14) to 1.2 x 10(15) states/cm2/eV corresponding to Sb4/Ga ratios of 2 to 9, respectively. X-ray rocking peaks of samples grown at various Sb4/Ga ratios, and subsequently subjected to annealing, indicate different interactions at the interfaces which might support the observations.
INVESTIGATION OF NEGATIVE DIFFERENTIAL RESISTANCE PHENOMENA IN GASB/ALSB/INAS/GASB/ALSB/INAS STRUCTURES
(1994-10-01)
WANG, YH
;
LIU, MH
;
HOUNG, MP
;
CHEN, JF
;
CHO, AY
The negative differential resistance (NDR) phenomena were observed in GaSb/AlSb/InAs/-GaSb/AlSb/InAs resonant interband tunnel structures. Electron has resonantly achieved interband tunneling through the InAs/GaSb broken-gap quantum well. The InAs well width causes significant variations of the peak current density and NDR behaviors. The peak current density varies exponentially with the AlSb barrier thickness. The multiple NDR behavior was observed with appropriate InAs well and AlSb barrier thickness, e.g., 30 angstrom thick AlSb barrier and 240 angstrom wide InAs well. Only single negative resistance has, otherwise, been seen. The three-band model was used to interpret the effect of the InAs well and AlSb barrier on the current-voltage characteristics of GaSb/AlSb/InAs/GaSb/AlSb/InAs structures.