A flexible n-type organic semiconductor for optoelectronics

作者：Gui Ke; Mutkins Karyn; Schwenn Paul E; Krueger Karsten B; Pivrikas Almantas; Wolfer Pascal; Stutzmann Natalie Stingelin; Burn Paul L^*; Meredith Paul

来源：Journal of Materials Chemistry, 2012, 22(5): 1800-1806.

DOI：10.1039/c1jm14089b

n-Type organic semiconductors are important for a range of optoelectronic applications including organic photovoltaic devices, light-emitting diodes, and field effect transistors (FETs). In spite of this clear motivation there has been significantly less development of n-type compounds relative to p-type systems. We have developed a simple, small molecule n-type material, 2-[(7-{9,9-di-n-propyl-9H-fluoren-2-yl}benzo[c][1,2,5]thiadiazol-4-yl)methylene]malononitrile (K12), that can be processed either by spin-coating from solution or evaporation in vacuum. The thermal properties of K12 enable the film morphology to be controlled at easily accessible temperatures allowing the charge mobility to be tuned over two orders of magnitude. The electron mobility in the films was found to be independent of the initial processing conditions (solution or evaporation). The electron mobility measured in a FET configuration was of the order of 10(-3) cm(2) V-1 s(-1) for films prepared via either processing method whilst Photoinduced Charge Extraction in Linearly Increasing Voltage (PhotoCELIV) gave a mobility of order 10(-4) cm(2) V-1 s(-1).

• 出版日期2012