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

fYear

2004

fDate

8-10 Dec. 2004

Firstpage

137

Lastpage

140

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.;

fLanguage

English

Publisher

ieee

Conference_Titel

Optoelectronic and Microelectronic Materials and Devices, 2004 Conference on

Conference_Location

Brisbane, Qld.

Print_ISBN

0-7803-8820-8

Type

conf

DOI

10.1109/COMMAD.2004.1577511

Filename

1577511