盤狀液晶分子及紫質高分子之合成及其在有機半導體元件之應用

Abstract

本研究的目標為致力於合成盤狀小分子與盤狀高分子，並將其應用於有機半導體元件，如有機場效電晶體(OTFT)與有機太陽能電池(OPV)。 在本研究的第一部分，我們合成了兩個 triphenylene 衍生物，這兩個分別為2,3,6,7,10,11-hexakis(hexyloxy)triphenylene(M1)及2,3,6,7,10,11-hexakis (dodecyloxy)triphenylene(M2)，還有兩個含有塞吩分子的 hexabenzocoronenes (M3 及 M4)，其中M1與M2兩個具有液晶相。M1 與 M2 的 UV 吸收峰皆在 250-350 nm 之間，而 M3 的吸收峰在 380 nm。M4 無法溶於任何溶劑。我們將這些單體旋轉塗佈在蒸鍍上金的矽晶圓表面。在熱退火與加壓之後，發現單體 M1 在表面上呈現 face on 的排列方式。我們預期此材料適合應用在垂直式有機電晶體元件上。 在本研究的第二部分，我們聚合了兩個紫質高分子聚合物，分別為 P1(PBPPDCB)與 P2(PBPPPTTP)，這兩個高分子均具有良好的溶解度。它們薄膜狀態的 UV 吸收在 Soret 頻帶有兩個窄的吸收峰，分別在 440 與 465 nm，在 Q 頻帶也有兩個較弱的吸收峰，分別是 560 與 620 nm。這兩個高分子的能隙皆在 1.8 eV 左右。我們將這兩個高分子與 PC71BM 混摻之後，應用在混摻異質接面型太陽能電池之主動層上，其中將 PC71BM 作為受體。其中以PBPPPTTP/PC71BM(1:3, w/w)混摻所製作的的元件，有最高的短路電流(Jsc) 3.05 mA/cm2，其光電轉換效率(PCE)為 0.74 %，在所有元件裡也是最高的。

The goal of this study is aimed to synthesis the disc-like molecules and macromolecules for the application in organic electronics which including organic thin film transistors(OTFT)and organic solar cells(OPV). In the first part of this study, two triphenylene derivatives, i.e. 2,3,6,7,10,11- hexakis(hexyloxy)triphenylene(M1) and 2,3,6,7,10,11- hexakis(dodecyloxy)triphenyl ene(M2), and two bithiophene-containing hexabenzocoronenes(M3 and M4) were synthesized. Among four monomers, M1 and M2 display liquid crystalline phase. The UV absorption peaks of M1 and M2 appear at the range from 250-350 nm while that of M3 shows at 380 nm. M4 can’t dissolve in any solvent. Those monomers were spin-casted at the gold-coated silicone surface. After thermal annealing and pressure, monomer M1 was found to form face-on arrangement on the surface. It shows potential application for the perpendicular OTFT. In the second part of this study, two kinds of porphyrin-containing conjugated polymer, P1(PBPPDCB) and P2(PBPPPTTP) were synthesized. Both polymers are soluble in common solvents. Their UV absorptions exhibit two sharp Soret bands at 440 and 465 nm and two weak Q-bands at 560 and 620 nm in the thin film state. The band gaps of both polymers are around 1.8 eV. Both polymers were used to fabricate the bulk heterojunction OPV devices using PC71BM as an acceptor. The PBPPPTTP/PC71BM(1:3, w/w) based device exhibited the highest short circuit current(Jsc) of 3.05 mA/cm2 with a highest power conversion efficiency(PCE) of 0.74 %.