Dear Jamshid,

welcome,

The electron affinity given by the Lumolevel is -4 eV according to the paper in the link:Article A Study of Inverted-Type Perovskite Solar Cells with Various...

Best wishes

dear professor Zekry

thanks for your guide about my question but there is a problem:

In the article you referred to, i could not find electron affinity but i found band gap of FAPbI3 and MAPbI3 which are unreliable to me because it reported the band gap of MAPbI3 2.3 while its value is bout 1.5 .

you said " The electron affinity given by the Lumolevel is -4 eV according to the paper " but in fact the LUMO level(which is different from electron affinity) is -4 .

Best wishes

Dear Jamshid,

The electron affinity is the energy required to raise the electron from the the bottom of the conduction band to the vacuum free electron level. Since in perovskite the Lumolevel is the bottom level in the conduction band then accordingly the the energy difference between the vacuum level and the Lumolevel will be equal to the electron affinity.

So, According the paper the lumolevel=-4= The electron affinity.

Best wishes

dear professor Zekry

Excuse me because of my weakness in basic physics discussions.

I picked up your explanation that E(vac)= 0 because of equation blew:

EA= E(vac) - E(c)

is it true?

Dear Jamshid,

Yes this is right and which i expressed it in words in my previous answers and tried to explain my answer.

The other part of your inquiry is the integrity of the results published in the literature you can your self verify the data by returning to the original data.

Wish you success and best wishes

dear professor Zekry

you helped me so much and i wish you success

Please I have also been searching for the electron affinity and the hole and electron mobilities of the Ruddlesden Popper perovskite but yet to find it.