My device shows linear current-voltage characteristics. It also shows highly stable photovoltaic behaviour.
Please give me appropriate reason and reference (if possible).
Hope you are well all,
I think one can not give a decisive answer except one get more information about the structure and its I-V characteristics.
As for the concept, the ohmic contact can not give photo voltaic effect it can give photoelectric effect. Photovoltaic effect needs a rectifying effect.
So if you have a rectifying effect you can observe the photovoltaic effect.
By definition an ohmic contact has very high recombination rate. Theoretically infinite. If there is effect with the incident solar radiation it can by changing the resistance of the body of the material constituting the junction.
Best wishes
Dear
A heterojunction is the interface that occurs between two layers or regions of dissimilar crystalline semiconductors. These semiconducting materials have unequal band gaps as opposed to a homojunction.
Junctions between differently doped regions of the same semiconductor material are called a homojunction, while a junction between two different types of materials is called a heterojunction. A heterojunction is an interface that befalls within two layers or regions of different crystalline semiconductors.
Hope you will understand about this.
Thanks. If any question please feel free to contact me.
Hi Pratik Pataniya ,
regarding your question in the title: a type-II heterojunction by definition consists of two semiconductors with a specific alignment of the conduction and valence bands, so this is a situation that never applies to metal-semiconductor (MS) structures.
MS contacts can, however, show photovoltaic behavior. The fact that you observe it is not necessarily indicative of a junction in the most narrow sense -- i.e., there does not need to be a Schottky barrier present, this can also happen on contacts that show ohmic behavior in dark. The important thing is that you need to have some sort of asymmetric transport, so for example by having very high conductivity for holes while electrons are really immobile, or/and a semi-permeable membrane for charge carriers = a contact that only lets one type of carrier pass. I highly recommend P. Würfels book "Physics of solar cells" to anyone working with solar cells, very good explanations in there.
The question is: how strong are these effects? Usually, structures that are ohmic in dark do not have large PV performance.
For us to further help you understand this, maybe you can elaborate on the structure you have made, and maybe attach an IV curve of the device.
KR Robert
Hi Pratik Pataniya ,
I realy agree with Robert Karsthof answer and suggest to add IV curve of the device.
Hope you are well all,
I think one can not give a decisive answer except one get more information about the structure and its I-V characteristics.
As for the concept, the ohmic contact can not give photo voltaic effect it can give photoelectric effect. Photovoltaic effect needs a rectifying effect.
So if you have a rectifying effect you can observe the photovoltaic effect.
By definition an ohmic contact has very high recombination rate. Theoretically infinite. If there is effect with the incident solar radiation it can by changing the resistance of the body of the material constituting the junction.
Best wishes
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