本研究以具硫醚碳鏈之聯噻吩為核心，並於其兩端引入二氰基亞甲基(dicyanomethylene)以及具有二氰基與烷基鏈的rhodanine基團，開發可溶性醌型有機薄膜電晶體材料DSTTQ與RHO-DSTT系列。在此之外，對實驗室開發的可溶性併環噻吩材料進行改良，並引入四併環TTA結構，開發出新的核心DSTTTA系列以及其衍生物。 在 n - type 材料開發方面，藉由噻吩硫醚鏈上之硫原子與中心噻吩硫原子之S‥S分子間作用力，開發出DSTT核心，於其兩側引入氰基，改變整體分子共振型態，開發出具長碳鏈之醌型材DSTTQ (1)，同時開發不具 S‥S 分子間作用力之DTTQ (2) 作為比較。Dicyano rhodanine為具有良好溶解度的拉電子基團，將其引入DSTT核心,開發出新的OTFT材料RHO-DSTT (3) 與b8RHO-DSTT (4)。 在 p-type 材料開發方面，以四併環噻吩TTA為核心，在其兩端引入具硫醚長碳鏈的噻吩基團增加共軛並改善其溶解度，合成出多併環核心DSTTTA (5)。並將二併噻吩與苯基結構引入核心，開發出DTT-DSTTTA (6) 與 DP-DSTTTA (7) 材料。 利用 UV-vis 和 DPV 探討所開發分子的 HOMO 與 LUMO 能階，藉由 TGA 和 DSC 探討這些新開發材料之熱穩定性。目前，化合物 已經由溶液製程製成元件初步測試，具有 n-type 場效性質，載子移動率可達 0.04 cm2/Vs。 具有 p-type 場效性質，載子移動率可達 0.02 cm2/Vs。其餘半導體材料之元件仍在待測中。 ;A series of new materials based on thioalkyl bithiopene core have been developed for organic thin film transistors (OTFTs). For comparing six rings p-type OTFTs material DDTT-BST developed which has a highest mobility in our past work, a new six-ring-core DSTTTA (5) were developed as well as its derivatives DP-DSTTTA (6) and DTT-DSTTTA (7). To improve the solubility, thioalkylated thiophenes were capped with a thiophene to give the DSTT core. Then a series quinoidal compounds were developed which are DSTTQ(1) and DRTTQ(2). The LUMO energy level of these three quinoidal compounds were measured by DPV and exhibited air stable properties Dicyanoalkylrhodanine is a strong electron-withdrawing group with good solubility and recently be used as a terminal unit of organic materials. Based on the DSTT core, two dicyanoalkylrhodanine capped OTFT materials were designed which are RHO-DSTT (3) and b8RHO-DSTT (4). Both of them show good solubility and thermal stability. The optical and electrochemical (HOMO and LUMO) properties of these materials were characterized by UV-vis and DPV. Thermal properties were investigated by TGA. The OTFTs studies of these compounds are in progress.
