The Characteristics of Functional Phototransistors
Experiments and modeling of functional heterojunction phototransistors (FPTs) are reported for comparing to HPTs without base electrode and conventional HPTs with a base electrode using the same epi-layers. Functional phototransistors having double emitters with different area ratio (A1:A2) but a fixed total area together with collector form a three-terminal device. As a voltage-bias emitter instead of a current-bias base is used, all kinds of FPTs exhibit an enhanced collector photocurrent as compared with a HPT with the same total emitter area. Experimental results reveal that 2:1 and 1:1 FPTs exhibit 1.85- and 1.5-fold optical gain of that from a HPT, respectively. Moreover, a new circuit model with three sets of parallel diodes was proposed to demonstrate the performance enhancement and polarity-dependent behaviors. Theoretical results are in very good agreement with experimental ones and indicate that more than 3-fold enhancement is expected.
S.W.Tan K.P.Liu C.W.Liao Y.S.Huang W.C.Chen H.H.Chen
Department of Electrical Engineering, Ching Yun University, 229, Chien-Hsin Road, Jung-Li, TAIWAN,China
国际会议
The Sixth International Workshop on Junction Technology(第六届国际结技术研讨会)
上海
英文
2006-05-15（万方平台首次上网日期，不代表论文的发表时间）