Amr Hessein

11 Questions 32 Answers 0 Followers

Questions related from Amr Hessein

Can anyone suggest a solar cell Modeling software for beginners?

I want to make modeling and simulation for thin film solar cell and thin film interfaces composed from nano structured materials. But I don't have any experience in that field. So any one can...

12 November 2016 1,353 72 View

How to solve the counter electrode dissolving problem in quantum dot sensitized solar cell?

I made my counter electrode from nickel sulfide- Graphene composite on FTO substrate by using PVDF as a binder. But when the QDSSCs assembled by using polysulfide electrolyte, the counter...

02 October 2015 5,253 2 View

What is the most suitable filter paper type for Graphene oxide filtration?

Can any one suggest the suitable filter paper used in filtering and washing graphene oxide prepared by Hummer's method.

24 May 2015 5,428 5 View

What is the most appropriate lamp type for handmade solar simulator?

I need to get a light source that simulate the sunlight in order to test my samples. Can I use "400 W metal halide lamp" or " Halogen lamp" is better?

16 April 2015 2,647 15 View

How can I prepare the Sodium Seleniosulfide (Na2SeSO3)?

I want to know the typical procedure for preparing (Na2SeSO3), to be used in assembling CdSe by SILAR method.

01 February 2015 4,855 4 View

Do you measure thin film thickness using filmetrics F20?

I need to use Filmetrics F20 (http://www.filmetrics.com/thicknessmeasurement/f20) to measure the thickness of tio2 layer coated on FTO glass used as a working electrode in dye sensitized solar...

27 October 2014 5,293 3 View

Can anyone tell me the procedure for Electrochemical Impedance Spectroscopy (EIS) of symmetric cell?

I working on developing a counter electrode of sensitized solar cell based on graphene. And I need to perform EIS of these electrodes. In the literature, the authors perform EIS of cells consist...

19 October 2014 8,858 10 View

Is there a method for preparing a stable polysulfide electrolyte redox system?

Alternative to the unstable sodium sulfide + sulfur in water + methanol one?

11 October 2014 8,585 1 View

Does anyone know the refractive index of TiO2 P25?

I need to measure the thin film thickness of mesoporous TiO2 layer using "filmetrics F20 thin film analyzer" but I want to know the refractive index of TiO2 P25

09 September 2014 6,863 4 View

Can anyone help with polysulfide electrolytes?

To whom work in quantum dot sensitized solar cell. I prepare polysulfide electrolyte with concentration 1M Na2S and 1M S in distilled water. My problem is after some time I found a green...

24 August 2014 2,957 2 View

Can anyone help with measuring sheet resistance of graphene thin film using the four probe collinear technique?

The resistance value is variable by changing the current value of the same measured point.

17 March 2014 1,249 7 View