Please share the details mechanism of the different layers used in Perovskite Solar cell e.g, FTO, TiO2, Perovskite layer, hole transporting layer, Ag/Au.
Thank you.
Dear Abdul Moyez,
The perovskite solar cells are composed of a thin effective photo absorbing layer which is the perovskite. It is preferred to be intrinsic. This layer must be supplied by an p-type hole collecting layer such as PEDOT-PSS in the conventional structure or SPIRO OMe TAD in the inverted structure. The other side of the perovskite must be supplied by an n-type material acting as an electron collector such as PCBM in the conventional cell and TIO2 for the inverted cell. The collecting layers must act as a rejection layer for the opposite carrier at the same time. Therefore they must satisfy the energy band alignment required for such functions . It is so that the conduction band edge of the electron transport layer must lie under that of the perovsite and the valence band edge of the hole transport layer must above that of the perovsite. At the same time the conduction band edge of the ETL AND the valence band edge of the HTL must be far separated from each other to maximize the contact difference of potential and consequently the open circuit voltage.
Such type of cells resembles in their operation the pin cells.
Lastly the three layer structure of the perovsite cells must be supplied by one transparent metallic electrode from one side and an opaque Metallic electrode on the other side. These metallic electrodes must make ohmic contacts with the underlying ETL and HTL.
From many literature i have chosen the paper in the Link:http://arxiv.org/ftp/arxiv/papers/1505/1505.05132.pdf
It is really useful.
Best wishes
Dear Abdul Moyez,
The perovskite solar cells are composed of a thin effective photo absorbing layer which is the perovskite. It is preferred to be intrinsic. This layer must be supplied by an p-type hole collecting layer such as PEDOT-PSS in the conventional structure or SPIRO OMe TAD in the inverted structure. The other side of the perovskite must be supplied by an n-type material acting as an electron collector such as PCBM in the conventional cell and TIO2 for the inverted cell. The collecting layers must act as a rejection layer for the opposite carrier at the same time. Therefore they must satisfy the energy band alignment required for such functions . It is so that the conduction band edge of the electron transport layer must lie under that of the perovsite and the valence band edge of the hole transport layer must above that of the perovsite. At the same time the conduction band edge of the ETL AND the valence band edge of the HTL must be far separated from each other to maximize the contact difference of potential and consequently the open circuit voltage.
Such type of cells resembles in their operation the pin cells.
Lastly the three layer structure of the perovsite cells must be supplied by one transparent metallic electrode from one side and an opaque Metallic electrode on the other side. These metallic electrodes must make ohmic contacts with the underlying ETL and HTL.
From many literature i have chosen the paper in the Link:http://arxiv.org/ftp/arxiv/papers/1505/1505.05132.pdf
It is really useful.
Best wishes
Simple description of Perovskite Solar cell e.g,
FTO = conductive transparent substrate
TiO2 = Semiconductor where the perovskite is deposited. This create a mesoporous interface, where electron are injected.
Al2O3 = Substituted TiO2 in some cell, in this case, the electron can not be injected, and it acts as a simple support for the perovskite.
Perovskite layer = adsorb the light and create the e-h couple. The electron can be injected in the inorganic support (TiO2 or Al2O3) or transported. Same for holes, that are usually injected in an inorganic transport layer (as CuI) or in an organic one
hole transporting layer = it covers the perovskite and collects the hole. Can be organic usually or inorganic.
Ag/Au = back contact
Dear Sir, Thanks for the explanations. Nice explanations sir. thnks
Abdelhalim abdelnaby Zekry you are one of the best educator on RG. explaining the concepts in a very simple way.
What if CB edge of ETL is above that of perovskite? I have simulated such a structure which is showing high PCE.
ex ZnO as ETL and CH3NH3PbI3 as absorber.
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