The ETL must satisfy specific requirement to function properly to work as an injector of electrons in the active material:

- The electron concentration must be as high as possible.

- The mobility of electrons must be also as high as possible.

- The energy levels must must match those of perovskite.

The lumolevel of the ETL must be higher than the conduction band of the active layer.

What is the effect of the molecular weight on these parameters must be known to judge which material alternative will be more suitable.

I would propose that you pragmatic on the issue and make planned experiments with the materials to evaluate it. Or you can measure the electronic properties of the material to assess its properness.

Best wishes

The ETL must satisfy specific requirement to function properly to work as an injector of electrons in the active material:

- The electron concentration must be as high as possible.

- The mobility of electrons must be also as high as possible.

- The energy levels must must match those of perovskite.

The lumolevel of the ETL must be higher than the conduction band of the active layer.

What is the effect of the molecular weight on these parameters must be known to judge which material alternative will be more suitable.

I would propose that you pragmatic on the issue and make planned experiments with the materials to evaluate it. Or you can measure the electronic properties of the material to assess its properness.

Best wishes

Dear Jitesh Pandya,

The different molecular weight of PEI have different impacts on the device performance. In the case of what you mentioned between 70,000 and 110,000MW, this could have slightly differences. You should try it. There are a few publications available for your refetences. Here list two below.

https://pubs.acs.org/doi/10.1021/acsami.5b08147

https://pubs.acs.org/doi/10.1021/acsomega.0c00758

Best wishes

Xuhua