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Integration of a novel punch-through heterojunction phototransistor with a compatible MODFET

A novel punch-through heterojunction phototransistor (PTHPT) integrated with a compatible modulation doped FET (MODFET) was fabricated. The two terminal operating PTHPT can provide the superior properties of high optical gain and high speed. This is done without introducing an amplified shot noise associated with a base bias current as found in a three terminal operating heterojunction phototransistor (HPT). The PTHPT fabricated in a 0.8-micrometers GaAs/AlGaAs material system exhibits an optical conversion gain as high as 1250 at an incident optical power as low as 0.5 (mu) W. The gain changes less than 15 percent over a 20 dB range of the incident optical power. The transient measurements show that the PTHPT has a higher response speed than that of a conventional HPT. The compatible MODFETs with 1-micrometers gate lengths exhibit transconductances over 200 ms/mm and a current density of 160mA/mm. The principle presented here can also be applied to other material systems such as GaSb/AlSb and InGaAs/InP for long wavelength optical communications.