The effect of impurities on the mobility of single crystal pentacene

TL;DR

This study demonstrates that purifying pentacene by removing impurities like 6,13-pentacenequinone significantly enhances hole mobility, with results aligning with band transport models, indicating improved organic semiconductor performance.

Contribution

It introduces a purification method that drastically reduces trap density and increases mobility in single crystal pentacene, advancing organic electronics.

Findings

Hole mobility reaches 35 cm2/Vs at room temperature

Mobility increases to 58 cm2/Vs at 225K

Impurity removal reduces trap density by two orders of magnitude

Abstract

We have obtained a hole mobility for the organic conductor pentacene of 35 cm2/Vs at room temperature increasing to 58 cm2/Vs at 225K. These high mobilities result from a purification process in which 6,13-pentacenequinone was removed by vacuum sublimation. The number of traps is reduced by two orders of magnitude compared with conventional methods. The temperature depandence of the mobility is consistent with the band model for electronic transport.