可撓性有機單晶場效電晶體電性與撓曲關係研究;Study of the eddect of bending on the electric characteristics of flexible organic single crystal based field-effect transistor

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题名:	可撓性有機單晶場效電晶體電性與撓曲關係研究;Study of the eddect of bending on the electric characteristics of flexible organic single crystal based field-effect transistor
作者:	何曼慈;Ho,Man-Tzu
贡献者:	化學學系
关键词:	電晶體;有機單晶
日期:	2015-07-23
上传时间:	2015-09-23 10:46:43 (UTC+8)
出版者:	國立中央大學
摘要:	有機半導體內的電荷傳遞與分子結構以及分子堆疊之形貌有極大關聯。欲探討分子結構與電荷傳導速率關連，受到分子堆疊成膜時的形貌影響。而單晶為分子間排列規則之完美晶體，以有機單晶製備電晶體適於研究材料本身結構與電荷傳遞速率之間的關係。另一方面，在軟性電子中，元件需經歷反覆撓曲，撓曲對元件電性影響是一有趣課題。本實驗使用可撓曲之有機分子TCDAP 單晶製備電晶體元件，研究撓曲對其載子傳遞能力之影響。在實驗過程中發現原元件結構在彎曲時易造成部分電極破壞和電極與晶體半導體間的接觸產生脫落，進而影響元件在彎曲狀態時電極部分電流貢獻於整體電流表現，使得在關閉狀態時，電流上升。經由改良其元件結構，發現以雙面膠直接固定晶體，降低基板與晶體間的高低差，可增加在彎曲時的支撐力和穩定性，且經由重複測量電性，也不會使關閉電流產生變化。在元件結構穩定後，便可排除結構因素，單就材料本質進行研究，發現在此單晶在不同彎曲方向，分別於載子遷移率上有相反的變化，而不同曲率之撓曲也造成不同之影響。推測其單晶在彎曲時造成分子間排列有些微的改變，進而影響載子傳遞速率。且此晶體在經由彎曲前後，電性呈現可逆之變化。;The charge transport in organic semiconductor highly depends on the structure and the packing morphology of the molecules. The study of structure/property correlation will be constrained by the morphology in the film formation. Single crystals have a perfect and regular molecular packing and transistors based on single crystals are suitable for the study of intrinsic structure and the charge transport. On the other hand, in soft electronics, the devices will be bent repeatedly. The effect of bending on the device property is an interesting subject to study. In this work, the single crystals of a flexible organic molecule TCDAP were used to study the effect of bending on carrier transport in the device. It is found that bending may cause damages in the electrode or the contact between the organic semiconductor and the electrode so that the off-current increased upon bending. It is found that a double-sided tape between the semiconductor crystal and the substrate provided support for the crystal so that repeatable and reproducible electric characteristics can be obtained. With the new device configuration, it was found that bending results in consistent yet opposite trends in mobility depending on the bending direction as well as the bending curvature. It is suggested that the intermolecular π-π distance changed upon bending, thereby III influenced the carrier transport ability . The crystal also exhibit reversible electric characteristics before and after bending.
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