Probing the electric double layer (EDL) effect using diamond-based FETs (IMAGE)

Tokyo University of Science

Probing the electric double layer (EDL) effect using diamond-based FETs

Caption

Figure 1. (a) Diagram of an all-solid-state Li-ion battery suffering from high interface resistance, suspected to be due to the EDL effect. (b) Diamond-based field effect transistors (FETs) let us modulate the hole density at the diamond channel by applying voltage, which in turns lets us measure the contributions of the EDL effect. (c, d) Two diamond-based FETs made using different Li-based solid electrolytes. The reduction–oxidation of Ti atoms enables charge neutralization within the Li-La-Ti-O electrolyte, greatly suppressing the EDL effect.

Credit

Tohru Higuchi from Tokyo University of Science

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