噻吩苯并噻二唑嵌段共聚物的制备及性能研究_材料与化学工程.rar

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摘要:本实验以2,7-双(4,4,5,5-四甲基-1,3,2-二氧杂硼烷-二基)-9,9-二辛基芴、4,7-二溴-2,1,3-苯并噻二唑、端基为溴的聚合度为7的己基噻吩齐聚物等原料,通过Suzuki偶合反应合成了D-A型嵌段共聚物。所得共聚物的数均分子量在5000-10000之间。通过紫外吸收光谱对共聚物进行表征,发现共聚物的最大吸收峰在波长为400-500nm,同时随着苯并噻二唑的比例的增加,最大吸收峰逐渐红移。由循环伏安曲线可以发现共聚物的能带隙较窄,且随着苯并噻二唑比例的增加,共聚物从既有空穴传输又有电子传输逐渐变为电子传输。在热稳定性方面,聚合物的最大分解区间为400-500°C,在此区间内,共聚物失重为40%-50%,且随着苯并噻二唑比例增大,其热稳定性有所降低。同时,我们探究共聚物在太阳能电池中的应用,发现共聚物薄膜在光照下产生了明显的光电流。

关键词:噻吩苯并噻二唑嵌段共聚物,D-A型推拉电子结构的有机半导体,窄能带隙的聚合物太阳能电池

 

Abstract:The thiophene benzothiadiazole block copolymers were synthesized by using 2,7-bis(4,4,5,5-tetramethyl-1,3,2-dioxoborane-diyl)-9,9-diotylfluorene,4,7-dibromo-2,1,3-benzothiadiazole and 3-hexylthiophene oligomers with the degree of 7. The block copolymers were prepared by Suzuki coupling reaction. The number average molecular weights of the copolymers were between 5000-10000. The copolymers were characterized by ultraviolet and visible spectrophotometer. The maximum absorption peaks were at the wavelength of about 400-500nm. With the increase in the propotion of benzothiadiazole , the maximum absorption peaks were redshifted. The bandgaps of the polymers calculated via the cyclic voltammetry curves of the copolymers were narrow. With the increase in the propotion of benzothiadiazole , the copolymers gradually turned from both hole transportion and electron transportion into electron transportion. The maximum decompositions in the thermal stability of the copolymers ranged from 400°C to 500°C. In this range, the weight loss of the copolymers were from 40%-50%. With the increase in the propotion of benzothiadiazole , the thermal stabilities of the polymers were decreased. The application in solar cells was explored and the photo current was found when the copolymer material film was irradiated.

Keywords:Thiophene benzothiadiazole block copolymer, D-A organic semiconductors, Polymer solar cells of narrow bandgap