摘要苯并噻二唑(BT)由于具有较强的吸电子能力和较高的共轭程度,而广泛应用于聚合物光伏材料的设计上,且制备的有机聚合物电池能取得较高的光电转换效率。苯并噻二唑的5、6位易于修饰,在5、6位分别引入一个氟和两个氟均可提升基于苯并噻二唑有机光伏材料的性能。所以本实验选择苯并噻二唑及其氟取代的衍生物作为受体(A)。噻咯是硅杂环戊二烯(DTS),由于硅原子与环戊二烯形成了σ*-π*共轭,使得该五元环结构的LUMO能量较低,噻咯的这个性质赋予它优异的物理化学性质和光学性质,本实验选择硅杂环戊并二噻吩作为给体(D)。通过Stille偶联的方法,合成了一系列基于以硅杂环戊并二噻吩为中心的给电子基团,以苯并噻二唑、5-氟苯并噻二唑、5,6-二氟苯并噻二唑为缺电子基团, 2-己基噻吩封端的一系列含杂原子A-D-A型有机共轭小分子,发现随着主链氟原子数的增加,小分子给体部分的光电性能有所提高。74498
毕业论文关键词:有机共轭小分子; 硅杂环戊并二噻吩; 苯并噻二唑; 光电性能; Stille偶联; A-D-A型结构
Abstract Because benzo-2,1,3-thiadiazole (BT) has the strong electron-withdrawing ability and high degree of conjugation,so it is widely used to design of polymer photovoltaic materials,and the preparation of an organic polymer battery can obtain high photoelectric conversion effectiveness。The 5 and 6 positions of the benzo-2,1,3-thiadiazole are easy to be modified,Fluorinated benzo-2,1,3-thiadiazole can improve the photovoltaic performance of the organic photovoltaic materials。So in this experiment,we choose benzo-2,1,3-thiadiazole and fluorine-substituted derivatives as a acceptor (A)。Because silicon atoms and cyclopentadiene form a σ*-π* conjugate in DTS,so the five-membered ring structure has LUMO lower energy, properties of DTS give a more excellent physical and chemical properties。We choose DTS as a donor (D)。By Stille cross-coupling method,the synthesis based on a series of DTS as electron donating groups。Benzo thiadiazole, 5-fluorobenzothiazol-thiadiazole,and 5,6-difluoro benzothiadiazole as lack of electronic groups,2-hexyl thiophene capped a series of hetero atoms A-D-A conjugated organic small molecule,with the increasing of the main chain of fluorine atoms,optical and electrical properties of small molecules to the body portion has improved。
Key words:organic conjugated molecules;optical properties;dithienosilole benzo-2,1,3-thiadiazole ;stille cross-coupling; A-D-A structure
目 录
1引言 1
1。1有机半导体材料的发展与应用 1
1。2有机半导体材料的分类 1
1。2。1空穴型半导体材料 1
1。2。2电子型半导体材料 2
1。3有机太阳能电池的简介 3
1。4有机太阳能电池的工作原理 4
1。5有机太阳能电池材料研究进展 4
1。5。1 有机聚合物给体材料发展情况 4
1。5。2 有机小分子给体材料发展情况 5
2实验内容 6
2。1立题思想 6
2。2实验原料及仪器 6
2。3单体分子的合成 7
2。3。1分子S1、S2、S3的合成路线 7
2。3。2化合物2-1的合成及表征 含杂原子A-D-A型共轭分子的合成及性质研究:http://www.youerw.com/cailiao/lunwen_85111.html