one of the most necessaire issue to increase the absorption of the perovskite solar cell layer is the degree of transparency of electron transport layer in n-i-p configuration.
so what is the most transparent electron transport layer ?
Dear Dimeh,
The most commonly used material as ETL in perovskite solar cells s a layer of mesoporous TiO2 (mp-TiO2) which can be used as scaffold layer as well.
Dear Dimeh,
welcome,
please look at the review paper: Current status of electron transport layers in perovskite solar cells: materials and properties at the link:Article Current status of electron transport layers in perovskite so...
It is that one used metal oxides and organic n type materials with high electron concentration and as high mobility as possible such that the electrical conductivity must be high enough not to lower the fill factor. The other selection factor is the matching between the perovskite and the ETL. The conduction band edge must be slightly lower than the that of the active layer to extract electrons and its valence band edge must be lower than that of the active layer to reflect the holes. The third requirement which you seek for is the high transparency of this layer. My opinion is that the ETL thickness is in the order of tens of nano meter so the high transparency may not be the factor having the highest priority.
Best wishes
In order to be transparent it must be a widegap material so that its absorption edge lies at a photon energy higher than the highest energy photons absorbed by the material. i second the colleagues that the most widely used ETL for perovskite is the TiO2. It satisfies the requirements on the ETL that i listed in my precious post.
Best wishes
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