Title :
Functional Double-Emitter HPTs with Different Emitter-Area Ratios
Author :
Chen, W.T. ; Chen, H.R. ; Lin, A.H. ; Tan, S.W. ; Lour, W.S.
Author_Institution :
Dept. of Electr. Eng., National Taiwan-Ocean Univ., Keelung
Abstract :
Differing from those conventional HPTs with and without the base electrode reported in the past, we introduce a three-terminal heterojunction phototransistor with double emitters (DE-HPT). The double emitters in the HPT are designed to exhibit a series of different area ratios (A1:A2), but the same total area. Furthermore, the two emitters together with the common collector form a new three-terminal device. Instead of current-bias base, a voltage-bias emitter is used to tune the collector photocurrent. It is found that the collector photocurrent for the DE-HPT is enhanced and tunable when compared to a SE-HPT (single emitter-HPT) with the same total emitter area. In addition, a circuit model with three sets of parallel diodes is employed to explain how the enhancement can be seen
Keywords :
optical design techniques; optical fabrication; photoconductivity; phototransistors; DE-HPT; collector photocurrent; double emitters; three-terminal heterojunction phototransistor; voltage-bias emitter; Electrodes; Gallium arsenide; Heterojunctions; Optical noise; Optical receivers; Photoconductivity; Phototransistors; Semiconductor diodes; Tunable circuits and devices; Voltage; Double-Emitter HPTs; collector photocurrent; different emitter-area ratios; optical gain.;
Conference_Titel :
Optoelectronic and Microelectronic Materials and Devices, 2004 Conference on
Conference_Location :
Brisbane, Qld.
Print_ISBN :
0-7803-8820-8
DOI :
10.1109/COMMAD.2004.1577511
