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采用Stille缩聚,合成了3个异靛蓝并[7,6-g]异靛蓝(DIID)和乙烯单元交替排列的共轭聚合物P0F、P2F和P4F,三者在DIID单元中分别含0、2和4个氟原子(F).3个聚合物均具有良好的平面性,前线分子轨道几乎在整个共轭骨架上离域.它们均具有宽的吸收光谱,吸收范围在400~1000 nm,光学带隙约为1.25 eV;随着氟原子数目的增加,聚合物的最高占有分子轨道(HOMO)和最低空分子轨道(LUMO)能级依次下降0.1~0.2 eV.以这3个聚合物作为活性层,制备了顶栅-底接触型有机场效应晶体管器件,随着氟原子数目的增加,聚合物的传输性质由双极传输变为n型传输.P0F和P2F是双极传输型聚合物,空穴迁移率(μ_h)分别达到0.11和0.30 cm~2 V~(-1) s~(-1),电子迁移率(me)分别达到0.22和1.19 cm~2 V~(-1) s~(-1).P4F是n型聚合物,me达到0.18 cm~2 V~(-1) s~(-1).
Conjugated polymers P0F, P2F and P4F with three isoindigo [7,6-g] isoindigo (DIID) and ethylene units were synthesized by Stille polycondensation. Each of them contained 0,2 And four fluorine atoms (F). All three polymers have good planarity and the frontier molecular orbital is delocalized almost in the entire conjugated framework. They all have a broad absorption spectrum with absorption in the range of 400-1000 nm and optical The band gap is about 1.25 eV, and the highest occupied molecular orbital (HOMO) and lowest molecular orbital (LUMO) of the polymer decrease 0.1 ~ 0.2 eV with the increase of the number of fluorine atoms. Layer, a top gate-bottom contact type organic field-effect transistor device is prepared, and as the number of fluorine atoms increases, the transmission property of the polymer changes from bipolar to n-type. POF and P2F are bipolar transmission type polymers, The hole mobility (μ_h) reached 0.11 and 0.30 cm ~ 2 V -1 s -1, respectively, and the electron mobility (me) reached 0.22 and 1.19 cm -2 V -1 s ~ (-1) .P4F is an n-type polymer and me reaches 0.18 cm -2 V -1 s -1.