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| 折扣與優(yōu)惠：團購最低可5折優(yōu)惠 - 了解詳情 | 論文格式：Word格式(*.doc) |  |
摘要:本實驗以2,7-雙（4,4,5,5-四甲基-1,3,2-二氧雜硼烷-二基）-9,9-二辛基芴、4,7-二溴-2,1,3-苯并噻二唑、端基為溴的聚合度為7的己基噻吩齊聚物等原料，通過Suzuki偶合反應(yīng)合成了D-A型嵌段共聚物。所得共聚物的數(shù)均分子量在5000-10000之間。通過紫外吸收光譜對共聚物進行表征，發(fā)現(xiàn)共聚物的最大吸收峰在波長為400-500nm，同時隨著苯并噻二唑的比例的增加，最大吸收峰逐漸紅移。由循環(huán)伏安曲線可以發(fā)現(xiàn)共聚物的能帶隙較窄，且隨著苯并噻二唑比例的增加，共聚物從既有空穴傳輸又有電子傳輸逐漸變?yōu)殡娮觽鬏?。在熱穩(wěn)定性方面，聚合物的最大分解區(qū)間為400-500°C，在此區(qū)間內(nèi)，共聚物失重為40%-50%，且隨著苯并噻二唑比例增大，其熱穩(wěn)定性有所降低。同時，我們探究共聚物在太陽能電池中的應(yīng)用，發(fā)現(xiàn)共聚物薄膜在光照下產(chǎn)生了明顯的光電流。 關(guān)鍵詞：噻吩苯并噻二唑嵌段共聚物，D-A型推拉電子結(jié)構(gòu)的有機半導體，窄能帶隙的聚合物太陽能電池
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
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