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7 months ago in Material Science By Shreya K

How do i actually measure charge mobility in organic solar cells?

I'm trying to measure how fast charge carriers move in an organic solar cell material. I keep seeing the Mott-Gurney law mentioned. How do I use it in an actual experiment?

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By Natasha Answered 2 months ago

You need a single-carrier device meaning you engineer it so only one type of charge (holes or electrons) flows. Then you measure current density vs. voltage. In the space-charge limited current (SCLC) regime, current should scale with voltage squared. Fit your data to J = (9/8)ε?ε?μ(V²/L³). ε? is your material's dielectric constant, L is the film thickness. Extract μ from the slope of J vs. V². Clean data, clean fit, clean mobility value.

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