14th Jul, 2020

Ain Shams University

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Question

Asked 2nd Jul, 2020

I am interested in including the inverse piezoelectric effect into my GaN HEMT simulation. Sentaurus Device provides a special feature that allows me to update the stress field by invoking the mechanic solver (Sentaurus Interconnect). But I don't have confidence in the results I got. Because from the mathematical point of view, solving the inverse piezoelectric effect is just a simple matrix multiplication (AB = C). However, the final matrix C I got was very weird - some components in C matrix should be zero but they are not. So I was wondering if there is anyone has the same situation about this?

Dear Han-Wei,

welcome,

You want to validate your results.

you can make this validation by solving a known simple example where it can be solved analytically or its numerical solution is known with high confidence.

You can simplify the geometry of the device such that it can be solved analytically.

Than you can compare your numerical solution with the analytical solution.

You must not solve specifically for the HEMT.

Best wishes

4 Recommendations

2nd Jul, 2020

DR Han: In COMSOL, mechanical strain due to thermal expansion is *a* one-way couple. ... in semiconductors *use a* combination of commercial software or write *their* own code. Venkatachalam et al. used *a* combination of *Sentaurus* for the electrical ... Strain due to the *inverse piezoelectric effect* in the HEMT *example* is modeled by?...

Regards-

Jones, Jason P., Matthew R. Rosenberger, William P. King, Rama Vetury, Eric Heller, Donald Dorsey, and Samuel Graham. "Electro-thermo-mechanical transient modeling of stress development in AlGaN/GaN high electron mobility transistors (HEMTs)." In *Fourteenth Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm)*, pp. 959-965. IEEE, 2014.

Dear Han-Wei,

welcome,

You want to validate your results.

you can make this validation by solving a known simple example where it can be solved analytically or its numerical solution is known with high confidence.

You can simplify the geometry of the device such that it can be solved analytically.

Than you can compare your numerical solution with the analytical solution.

You must not solve specifically for the HEMT.

Best wishes

4 Recommendations

Which is more important for a good professor: citations, ethics or morals?

Discussion

1143 replies

- Asked 8th Feb, 2019

- Quan Hoang Nguyen

Before you participate in this thread, can you please** read the context** and the questions below. Please share your opinions by filling in the survey https://forms.gle/9E8RVkQ65bdzCrjy6 (anonymous)

Nowadays, so-called scientists are judged based on citations, publications and related metrics. Ethical and moral principles have no position in the system. The only information available is his/her publications, collaborations and citations. How do prospective students / collaborators find out the other info?

I know a lady full professor who "**borrowed**" work and ideas from collaborators (including me, former colleagues and even her advisor -- a distinguished professor I had admired) for her own prizes, promotions and fundings ***silently***. (PS: Edited July 2020: I'm unsure with the part about "her advisor" as I should not speak on someone's behalf, and some sources and reality may show a different story)

Her participation is minimal if not to say zero to the work. She blocks everyone (junior to most senior) to advance, for her own sake. She has zero programming skills, but claims collaborators' work as if she were an expert for national funding and new collaborators.

Further:

- helped her to secure an industry-linked grant and they were then kicked out.

- Many of her citations were from collaborators' work. But then she blocked them.

See links for more details:

- Have you seen or experienced a similar situation? **Is it the norm? Is it common?** How to **prevent** such corruption? If not, **what is academia pursuing?**

- Assume that each of the values (citation, ethics and morals) is in the scale from 0-10. What is **your opinion** about which values a good professor should have? For example, (4,0,0), (6,0,0), (6,1,1), (5, 5, 5), (4,9,9), (4,10,10)?

- When some people say citations is more important, do they mean they prefer (4,0,0), (6,0,0), (6,1,1)?

Two open questions in RG:

PS: Citations (C) in this question is a simple notation for whatever is used by the system (#publications, #collaborations, #collaborators, grants, awards, etc -- whatever except the ethics and morals).

This is an open question about the attributes of your ideal (good) professors. It's not about choosing C, E or M, but rather than saying your preferred attributes of an ideal professor.

Is Any Effective Refutation of Einstein’s Theories of Relativity Possible?

Question

5630 answers

- Asked 2nd Apr, 2018

- Abdul Malek

Article

- Jul 2015

In this article, 3 MeV proton irradiation-induced degradation in InP/InGaAs double heterojunction bipolar transistors (DHBTs) is studied, the fluence up to 5 × 1012 protons/cm2, meanwhile 10 MeV proton irradiation is investigated in order to compare the differences induced by different proton energy irradiation. The devices exhibit good tolerance u...

Article

- Oct 2011

This paper presents the simulation model of Dual Magnetodiode and Dual Schottky Magnetodiode using Sentaurus TCAD to simulate the virtual structure of magneto device and apply Hall Effect to measure magnetic field response of the device. Firstly, we use the program to simulate the magnetodiode with p-type semiconductor and aluminum anode and measur...

Conference Paper

- Mar 2018

This work addresses the simulation of a com- mercial p-channel MOSFET (3N163) using Sentaurus TCAD tool to observe the behavior of this device operating under heavy-ion environment, in order to study Single Event Effect (SEE) mechanisms and its effects. The simulated results were used to understand experimental data collected on field and make a co...

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