Sabah Gaznaghi

7 Questions 12 Answers 0 Followers

Questions related from Sabah Gaznaghi

Which technology do you think will better convert a monochromatic light into electricity than III-V technology (like GaAs solar cells)?

In other words which technology do you think has better monochromatic conversion efficiency?and why? Definitely an optimal bandgap make GaAs solar cells able to better convert a monochromatic...

04 April 2016 9,703 15 View

How ligands, such as isothiocyanate are able to bring down the LUMO, in dye sensitized solar cells?

These ligands are able to impose a change in LUMO level which is so called red shift in absorption properties of dye complex in dye sensitized solar cells. How this is related to better electron...

12 December 2015 6,378 2 View

Is there any direct approaches to derive the diffusion coefficient from open-circuit voltage or short-circuit current density?

What we have are Voc and Jsc . We know D can be expressed in: L=(Dt)1/2 where, L is diffusion length, D is diffusion coefficient and t is carriers life time or J=qD(dn/dx) where, J is current...

10 October 2015 5,623 4 View

When do we use conventional hall effect experiments and when do we use QHE experiments?

is sample's dimension a determinant factor to exert which type of experiment? for example if the sample is a bulk material... the aim is to find out charge carrier density of the material. is...

05 May 2015 5,497 2 View

What is the relation of drift velocity to thermal velocity?

can we say these two velocities are equal, just in a degeneracy state? VD=VthF1/2(η)/F0(η) when : Vth=(2kBT/m*)1/2 Γ(3/2)/Γ(1) then : VD=(2kBT/m*)1/2 Γ(3/2)F1/2(η)/Γ(1)F0(η) is for a 2D...

05 May 2015 292 4 View

What factors should I concern with and consider as I’m going to find a suitable natural pigment for a dye sensitized solar cell?

At first step, we do not have any ideas about a newly found natural dye's band structure, absorbency and other crucial properties.

04 April 2015 817 3 View

Which deposition method has better consequences (e.g. Hall mobility, resistivity and transparency) in solar cells?

Available materials are AZO(ZnO:Al), FZO(ZnO:F), ITO(In2O3:Sn) and FTO(SnO2:F). the selection of deposition method when considering the costs doesn’t follow the same when selecting a deposition...

03 March 2015 2,492 7 View