Field-Effect Transistors Based on Langmuir−Blodgett Films of Phthalocyanine Derivatives as Semiconductor Layers

作者：Kai Xiao, Yunqi Liu, Xuebin Huang, Yu Xu, Gui Yu, Daoben Zhu · 发表于：The Journal of Physical Chemistry B · 年份：2003 · DOI：10.1021/jp0349379 · 被引用次数：73 · 研究领域：Analytical Chemistry and Sensors、Advanced Memory and Neural Computing、Organic Electronics and Photovoltaics

Two soluble phthalocyanine derivatives, 2,9,16-tri( tert -butyl)-23-(10-hydroxydecyloxy) phthalocyanine ( 1 ) and 2,9,16-tri( tert -butyl)-23-(10-hydroxydecyloxy) copper phthalocyanine ( 2 ) were used as semiconductor layers in organic thin-film transistors (OTFTs) based on their Langmuir−Blodgett (LB) films. From the π− A curves, we can conclude that the phthalocyanine 1 and 2 molecules are in a titled arrangement at the air−water interface. The molecular ordering in the LB multilayer films on the SiO 2 substrate was examined by using UV−Vis absorption spectra and atomic force microscopy (AFM). The highest occupied molecular orbital and the lowest unoccupied molecular orbital were determined, and the energy band diagram of their OTFTs can be deduced by the cyclic voltammetric measurements. The LB films of phthalocyanine 1 and 2 were subsequently made into p-channel field-effect transistors, which were generally operated in the enhanced mode. The channel mobilities of phthalocyanine 1 and 2 were calculated to be about 4.8 × 10 -5 cm 2 V -1 s -1 and 4.0 × 10 -4 cm 2 V -1 s -1, respectively.