Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method

作者：Yuan, Yongbo; Giri, Gaurav; Ayzner, Alexander L.; Zoombelt, Arjan P.; Mannsfeld, Stefan C. B.; Chen, Jihua; Nordlund, Dennis; Toney, Michael F.; Huang, Jinsong^*; Bao, Zhenan

来源：Nature Communications, 2014, 5(1): 3005.

DOI：10.1038/ncomms4005

• FIELD-EFFECT TRANSISTORS
• THRESHOLD-VOLTAGE
• CHARGE-TRANSPORT
• SEMICONDUCTORS
• IMPURITIES
• PRESSURE
• CRYSTALS
• SENSORS

Organic semiconductors with higher carrier mobility and better transparency have been actively pursued for numerous applications, such as flat-panel display backplane and sensor arrays. The carrier mobility is an important figure of merit and is sensitively influenced by the crystallinity and the molecular arrangement in a crystal lattice. Here we describe the growth of a highly aligned meta-stable structure of 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene (C8-BTBT) from a blended solution of C8-BTBT and polystyrene by using a novel off-centre spin-coating method. Combined with a vertical phase separation of the blend, the highly aligned, meta-stable C8-BTBT films provide a significantly increased thin film transistor hole mobility up to 43 cm(2)Vs(-1) (25 cm(2)Vs(-1) on average), which is the highest value reported to date for all organic molecules. The resulting transistors show high transparency of >90% over the visible spectrum, indicating their potential for transparent, high-performance organic electronics.

• 出版日期2014-1