High charge-carrier mobilities in blends of poly(triarylamine) and TIPS-pentacene leading to better performing X-ray sensors

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• 作者：Akarin  ; Intaniwet¹ ; Joseph L.  ; Keddie  ; ;   ; ^{j.keddie@surrey.ac.uk} ; Maxim  ; Shkunov ; Paul J.  ; Sellin
• 关键词：Sensors ; Mobility ; X-ray detection ; Charge transport ; Time-of-flight photocurrent ; TIPS pentacene
• 刊名：Organic Electronics
• 出版年：2011
• 出版时间：November 2011
• 年：2011
• 卷：12
• 期：11
• 页码：1903-1908
• 全文大小：777 K

文摘

A new class of X-ray sensor ?in which there is a blend of poly(triarylamine) (PTAA) and 6,13-bis(triisopropylsilylethynyl) (TIPS)-pentacene in the active layer of a diode structure ?has been developed. The crystalline pentacene provides a fast route for charge carriers and leads to enhanced performance of the sensor. The first time-of-flight charge-carrier mobility measurement of this blend is reported. The mobility of PTAA and TIPS-pentacene in a 1:25 molar ratio was found to be 2.2 ¡Á 10^? cm² V^? s^? (averaged for field strengths between 3 ¡Á 10⁴ and 4 ¡Á 10⁵ V cm^?), which is about 17 times higher than that obtained in PTAA over the same range of field strengths. This higher mobility is correlated with a fourfold increase in the X-ray detection sensitivity in the PTAA:TIPS-pentacene devices.