Navid Jahed

8 Questions 3 Answers 0 Followers

Questions related from Navid Jahed

What are the features of good PECVD silicon dioxide film for photonic/optoelectronics and telecomunication application?

Both for 1330 nm and 1550 nm

03 July 2021 4,467 2 View

What are the differences (Pros and Cons) of PECVD deposited SiO2 with TEOS Vs. SiH4 gas for optoelectronic and photonic applications?

Which one is better regarding loss, stress, roughness for photonic and optical applications at 1330 nm and 1550 nm wavelengths.

03 July 2021 3,738 1 View

Problem in adhesion of photo-resists on Cr?

I have deposited Ti/Au Cr metal layer (Cr being the last layer) on LT-GaAs substrate. now that I want to perform lithography, the photoresist (nlof 2035) has low adhesion to the underlying Cr and...

17 January 2019 7,740 3 View

Can LT-GaAs be grown in MOCVD (instead of MBE) for terahertz application?

I was wondering if LT-GaAs or other III-V materials such as InGaAs/InAlAs that are grown in MBE for Terahertz application can be grown in MOCVD ? What are the differences? Pros and cons of each...

06 November 2018 3,631 3 View

Conductive black/greyish coated layer formed after reactive Ion Etching of InAlAs/InGaAs on InP substrate?

I have etched InAlAs/InGaAs film on semi-insulator InP substrate. In fact I am making some devices which active area is doped InAlAs/InGaAs. I need to etch through the devices till I get to Si-INP...

11 December 2017 5,019 5 View

Selective etching of Ti/Gold/Cr on GaAs/InP?

I am trying to develop a pattern on GaAs layer deposited on InP substrate by lift off process. Apparently lift off process didn't work. I want to remove the metals (Ti:20 nm, Gold 150 nm/Cr:50 nm)...

29 October 2017 3,549 3 View

Why is solar cell, illuminated current above VoC finally matches the dark current. What does it indicates, if it doesn't match?

What is the reason when illuminated current does not follow dark current at voltages above Voc? This is also the case for QD-heterojunction solar cells.

01 April 2016 9,038 2 View

What is the suitble/proper ligand for deposition of QDs (CdSe core and CdSe/ZnS) on ZnO surface?

I have CdSe/Zns and CdSe QDs. The ligand is OA (Oliec Acid) and the QDs are dispersed in nonpolar solvant (like: Hexane,chloroform) I want to form QD layer (up to 200nm) on the surface of ZnO...

25 August 2015 8,461 4 View