If we use CH3NH3PbCl3 as Electron transport layer and Ch3NH3SnI3 as absorber layer.
Dear Paramita Sarkar ,
Your question is interesting and it is out of the box. But I would like that you answer my following questions:
In order to use CH3NH3PbCl3 as Electron transport layer it must be made n-type with high electron concentration. Can you dope it in this way?
The second question is THE ETL must be more or less transparent for the absorber in the sense it must have a much higher bandgap.
Or it may be put in the back side.
The last requirement It must have an electron affinity equal or greater than the absorber to extract the holes from the absorber.
These are the questions that you must answer to judge that your proposed material cab act as a good ETL.
I would rather expect as the two materials act as absorbers that the function intended may not be very feasible.
I would propose that you better make a heterojunction from both materials to form a heterojunction p-n junction solar cell.
In order to design a device one has to consider the functionality of every layer in it such that the whole structure can work as intended.
Best wishes
Dear Paramita, thank you for asking this interesting technical question. In this context please have a look at the following potentially useful article describing the advantages of "all‐perovskite tandem solar cells". The paper was published last year:
Combining Efficiency and Stability in Mixed Tin–Lead Perovskite Solar Cells by Capping Grains with an Ultrathin 2D Layer
Article Combining Efficiency and Stability in Mixed Tin–Lead Perovsk...
Fortunately this article is freely available as public full text on RG. Also please go through the following relevant Open Access paper:
Tin-lead halide perovskites with improved thermal and air stability for efficient all-perovskite tandem solar cells
https://www.osti.gov/servlets/purl/1490726
(see attached pdf file)
Good luck with your research and best wishes, Frank Edelmann
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