Space charge limited current is prevailing in intrinsic materials with very low carrier concentration. The other condition for the SCLC is that the two contacts of the specimen must be ohmic. In this way the current can not be injection limited. The charges in their flow in the material can limit the current if the electric field is sufficiently small to be able to dispatch rapidly the charges from the material. So, it is always preferred to make the length of the specimen relatively large.

Ohmic contacts can be achieved by tunneling or by very low potential barrier Schottky contacts or by high recombination interfaces.

For the current transport mechanism please see the link: https://www.researchgate.net/post/How_is_the_current_limited_in_metal_organic_semiconductor_metal_MOSM_diode

Best wishes

Space charge limited current is prevailing in intrinsic materials with very low carrier concentration. The other condition for the SCLC is that the two contacts of the specimen must be ohmic. In this way the current can not be injection limited. The charges in their flow in the material can limit the current if the electric field is sufficiently small to be able to dispatch rapidly the charges from the material. So, it is always preferred to make the length of the specimen relatively large.

Ohmic contacts can be achieved by tunneling or by very low potential barrier Schottky contacts or by high recombination interfaces.

For the current transport mechanism please see the link: https://www.researchgate.net/post/How_is_the_current_limited_in_metal_organic_semiconductor_metal_MOSM_diode

Best wishes

Abdelhalim Zekry

Dear Prof,

That would mean we can't measure SCLC in TIO2 because of its high carrier concentration ?

Dear Harikesh,

I know that TiO2 is intrinsically conductive oxide with high electron concentration. Conductive oxides normally behave metal like.

I preferred to give a conceptual answer to your question and let you answer your question yourself. And you got it. Yes, you are right.

Best wishes

Hello, I have done some research about the trap energy (activation energy) calculation on TiO2 nanorod arrays before. Hope this helps.

Xiao, M., et al., Reliable and Low-Power Multilevel Resistive Switching in TiO2 Nanorod Arrays Structured with a TiOx Seed Layer. ACS Appl Mater Interfaces, 2017. 9(5): p. 4808-4817.