What are all the possible reasons for Spontaneous symmetry breaking in a double quantum well system?

Dear frnds, From my point of view SSB is happening due to following reasons in double quantum wells. 1. Due to variational technique 2. symmetry in envelop function and...

09 October 2019 7,944 2 View

How to account Bandgap renormalization in QWs?

Band gap re-normalization dynamics in nanostructures would induce lot of activities as we study interaction of 2D layer with light. Its understanding needs some clarity as below: 1. Which...

03 April 2019 3,846 5 View

What is the significance of size dependent dielectric screening in optimizing excitonic properties?

Mott-Wannier excitons are formed in a semiconductor material as a result of light-matter interactions. However, their delocalizing properties inside the crystal induce screening effects in their...

01 February 2019 2,333 1 View

What do you mean by band gap renormalisation regarding excitonic materials?

I often read about band-gap re-normalization in excitonic states contained in nanostructures. Please elaborate this effect and its significance.

04 May 2018 5,968 0 View

How to prepare a photoanode of DSSC using GQDs supernatant solution ?

GQDs are synthesized from GO using ammonia solution.After hydrothermal treatment the solution was filtered using 0.22 micrometer membrane. Finally to obtained GQDs as a supernatant liquid. Can...

04 May 2017 1,054 0 View

How to separate GQDs from the synthesized final solution?

04 May 2017 7,328 11 View

Can any body explain the sub-band structure of Quantum Rings?

Quantum Rings are an ideal nanostructure where its subbands are peculiar in nature. It shows higher binding energy than the effective Rydberg at bulk limit. A contrasting behavior than the...

02 March 2016 4,296 1 View

Charge collection efficiency of a Solar Cells

ncc=(1+ (Rs/Rct))-1 What is the effective way to account this property?

01 January 1970 8,073 1 View

What are anisotropic electrical and optical properties of a semiconductor due to?

In some materials, properties such as band gap, thermal conductivity differ along different crystallographic axes. What are the basics?

01 March 2021 1,923 3 View

How to calculate Z (the number of molecules in a unit cell) for calculating theoretical density?

I am trying to calculate the theoretical density of my ceramics materials. I use the formula below to calculate the theoretical density: Theoretical density = (Molecular weight x No. of molecules...

24 February 2021 3,823 2 View

How the Ground Plane implantation is performed without damaging (and w/o varying the undoped nature) the top Si (8-10 nm) in FDSOI technology ?

It is a general practice to introduce Ground Plane in FDSOI devices under the BoX. The Ground Planes are introduced by Ion Implantation through Top Si layer and Buried Oxide. I wanted to know that...

24 February 2021 5,974 4 View

Can a semi-conductor material have different absorption coefficient?

Does the absorption coefficient of the semiconductor changes with the change in the structure of the semiconductor? If you have a thin film and nanowire of the same semiconductor, will the...

23 February 2021 9,799 4 View

What is the reason film thickness increased?

what is the reason film thickness increased when increased doping concentrations give some reasons The measured film thickness is 156, 282, 394, 548 and 681 nm for 0, 1.5, 2.5, 3.5, and 4.5 wt....

17 February 2021 8,987 5 View

How can we determine the band gap of a composite material that is made up of a composition of direct and indirect band gap semiconductor materials?

I have a direct band gap material and an indirect band gap material. If I made a composite of both through physical mixing. Then how can I determine the band gap of such a material as the Tauc...

17 February 2021 8,104 4 View

How doping in nano-particles with same valency affect it's crystal lattice structure?

When doping in case of semiconductor is concerned, we doped Si by trivalent or pentavalent impurity atoms to improve its electronic properties but in case of nano-particles, sometimes we doped...

31 January 2021 7,128 1 View

Any resist stripper which can remove thick metal based polymer residue and which is compatible with doped silicon ?

I am looking some resist strippers which can easily remove metal based polymer residue after post dry etch process. I have some candidates below but not sure if they are compatible with doped...

21 January 2021 3,008 3 View

What is the best way to calculate electrical conductivity of semiconductors and the same system with a layer of oxide using Quantum Espresso?

I have tried BoltzTrap, and EPW but I'm not sure whether Boltzmann Transport Equation is a right approach for a complex system (semi cond. + an Oxide layer or even the semiconductor itself). Also...

11 January 2021 4,597 4 View

How to calculate the band potential of a semiconductor material using energy band gap?

I am looking for methods to calculate the band potential of ZnFe2O4 and Fe2O3.

05 January 2021 6,416 2 View