JOURNAL PAPERS

Impact of visible light and humidity on the stability of high-power light emitting diode packaging material

There are many advantages of LEDs in energy and environmental conservation, but their short life in many outdoor applications prompt a necessity to have a detailed understanding of their degradations to prolong their lifetime, which can also conserve LED material and even expand their applications. Using ab initio density functional theory formulation, we identify the detail paths …

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Electronic Reliability Analysis under Radiation Environment

Advances in semiconductor technology have enhanced the functionality of sensor arrays with reduced feature sizes. Owing to the spread of the Internet of Things, sensors can now be found in many applications operating in various environments. Proton and neutron radiation are always present around us but have not been detrimental to electronics at sea level. …

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Application of Gallium Nitride Technology in Particle Therapy Imaging

A transimpedance amplifier (TIA) is an essential electronic circuit in prompt gamma detection. To improve the performance and reliability of the electronics, we designed a TIA using GaN high electron mobility transistor (HEMT) as it is more radiation-hardened when compared to its silicon counterpart and it has lower noise. Our circuit is designed using GaN …

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Effect of 150 MeV protons on carbon nanotubes for fabrication of a radiation detector

High energy and high flux protons are used in proton therapy and the impact of proton radiation is a major reliability concern for electronics and solar cells in low earth orbit as well as in the trapped belts. Carbon nanotubes (CNTs), due to their unique characteristics, have been considered for the construction of proton and …

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GaN-Based Readout Circuit System for Reliable Prompt Gamma Imaging in Proton Therapy

Prompt gamma imaging is one of the emerging techniques used in proton therapy for in-vivo range verification. Prompt gamma signals are generated during therapy due to the nuclear interaction between beam particles and nuclei of the tissue that is detected and processed in order to obtain the position and energy of the event so that …

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Investigate the Equivalence of Neutrons and Protons in Single Event Effects Testing: A Geant4 Study

Neutron radiation on advanced integrated circuits (ICs) is becoming important for their reliable operation. However, a neutron test on ICs is expensive and time-consuming. In this work, we employ Monte Carlo simulation to examine if a proton test can replace or even accelerate the neutron test, and we found that 200 MeV protons are the …

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Lineal Energy of Proton in Silicon by a Microdosimetry Simulation

Single event upset, or Single Event Effect (SEE) is increasingly important as semiconductor devices are entering into nano-meter scale. The Linear Energy Transfer (LET) concept is commonly used to estimate the rate of SEE. The SEE, however, should be related to energy deposition of each stochastic event, but not LET which is a non-stochastic quantity. …

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Statistical Method and Non-Destructive Analytical Tools in the Failure Analysis of LED Array

When several units failed during operation or reliability test, and their failure modes are the same, it is difficult to examine if there are multiple failure mechanisms unless destructive analysis is performed on every units. However, this can be very time and resource consuming. This work demonstrates a method that combine statistical method and non-destructive …

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