噻吩并噻吩熔合之六環分子為主體之非富勒烯衍生物之合成及其於有機太陽能電池之應用

Abstract

本研究中，兩個新的非富勒烯受體：TCTT-IC和TCTT-4FIC以噻吩並噻吩熔合之六環分子單體為基礎的多電子基團並將兩側分別接上修飾了 零個與兩個氟化官能基之2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC)的缺電子基團，所有材料的吸收光譜都擁有高吸收係數在600到900 nm區間。加上氟化可以降低整體的LUMO能階，也讓吸收更加地紅位移並增加整體的結晶性。而混摻異質接面太陽能電池則是以TCTT-IC搭配PTB7-Th 和 TCTT-4FIC搭配PTB7-Th的混摻主體顯示出能量轉換效率分別為8.15 %及8.06 %。同時也探討氟化對於電化學性質、成膜的形態及光電性質的影響。

In this study, two new non-fullerene acceptors: TCTT-IC and TCTT-4FIC based on hexacyclic dithiophene and thienthiophene fused ring on the electron rich unit and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile (IC) with 0-2 flouorine substituents on the electron-deficient units. Both compounds exhibit broad absorption in the range from 600 to 900 nm with high extinction coefficients. Fluorine substituent downshift the LUMO energy level, red-shifts the absorption spectrum and enhances the crystallinity of the blend. The bulk heterojunction solar cell based on TCTT-IC/PTB7-Th and TCTT-4FIC/PTB7-Th blends exhibit respectively power conversion efficiencies of 8.15 % and 8.06 %.The effect of fluorine substituents on electronic properties, film morphology and photovoltaic properties were investigated.