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Title: Effects of Temperature and Stress on the InGaP/GaAs Heterojunction Phototransistor
Authors: Than, Hong Phuc
Tran, Thi Tra Vinh
Le, Thi My Hanh
Than, Quang Tho
Nguyen, Vu Anh Quang
Tran, The Son
Keywords: Heterojunction Phototransistor (HPT)
Emitter-ledge Passivation
Electrical Stress
Temperature Dependence
Issue Date: 30-Jun-2021
Publisher: Journal of Science and Technology: Issue on Information and Communications Technology
Abstract: Although the effects of electrical stress and temperature on the performance of the InGaP/GaAs heterojunction bipolar transistors (HBTs) have been widely studied and reported, little or none was reported for the InGaP/GaAs heterojunction phototransistors (HPTs) in the literature. In this paper, we discuss the temperature-dependent characteristic of InGaP/GaAs HPTs before and after electrical stress and assess the effectiveness of the emitter-ledge passivation, which was found to effectively keep the InGaP/GaAs HBTs from degrading at higher temperature or after an electrical stress. The emitter-ledge passivation is also effective keeping a higher optical gain even at higher temperature. An electrical stress was given to the HPTs by keeping the collector current at 60 mA for 15 min. Since the collector current density as an electrical stress is 24 A/cm2 and much smaller than the stress usually given to smaller HBTs for the stress test, the decreased optical gain was not observed when it was given at room temperature. However, when it was given at 420 K, significant decreases of the current gain and optical gain were observed at any temperature. Nevertheless, the emitter-ledge passivation was found effective in minimizing the decreases of the current gain and optical gain.
Description: Journal of Science and Technology: Issue on Information and Communications Technology; Vol 19 No 6.2 (2021); pp.28-32
ISSN: 1859-1531
Appears in Collections:NĂM 2021

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