Solution processed OTFTs for OLED backplanes: development of high performance short channel length devices

Abstract

High performance short channel OTFTs with field effect mobilities greater than 1cm 2 V -1 s -1 have been developed for OLED driver applications incorporating soluble crystalline semiconductor materials. We highlight the impact of contact resistance on the mobility in these devices and show by functionalising both the source and drain contacts and channel regions in a top gate bottom contact device architecture that the mobility can be significantly improved. Our approach also includes the optimisation of solvent selection from which the semiconductor material is deposited in order to enhance crystalline domain formation.

The influence of directed π–π interactions in solution on the thin film organic semiconductor device properties of small molecule polymer blends

“…[1][2][3][4] However, care has to be taken with respect to thin film processing conditions because measured mobility values can vary significantly across a single substrate. 5 Recent reports have shown that when an oligoacene is blended with a suitable polymer an improvement in both OTFT performance and reproducibility can be observed. [6][7][8][9][10][11][12][13][14][15][16][17] 6,13-Bis(triisopropylsilylethnyl) pentacene (TIPS-pentacene) when blended with an insulating polymer has been shown by several groups to give good OTFT performance.…”