基于苯并二噻吩的D-A型共轭聚合物给体材料的合成及其光伏性能研究
发布时间：2018-10-23 20:33
【摘要】：太阳能是一种取之不尽用之不竭的清洁能源,随着化石能源的枯竭、环境日益恶化,能将太阳能转换为电能的太阳能电池成为了新的研究热点。聚合物太阳能电池因其具有成本低、质量轻、可制成大面积器件等优点而备受关注。虽然现在PCE已经超过10%,但对于商业化应用仍是不够。设计并合成新材料是聚合物太阳能电池的一个研究重点。本文在BDT中心苯环上分别引入了2-烷氧基噻吩基和2-烷基硫代噻吩基,得到两个给体单元M1和M2;又分别合成了以呋喃和噻吩为π桥的DPP受体单元M3和M4。分别以M1和M2为给体单元,通过Stille聚合方法,与M3、M4共聚得到四种吸收在近红外区域的聚合物：PBDTT-O-FDPP, PBDTT-S-FDPP、PBDTT-O-TDPP和PBDTT-S-TDPP;与TPD聚合得到两种具有高开路电压的聚合物：PBDTT-O-TPD, PBDTT-S-TPD;与BT和BT(F)聚合得到四种吸收在最大光强和光子通量区域的聚合物：PBDTT-O-BT、PBDTT-S-BT、PBDTT-O-BT(F)和PBDTT-S-BT(F)。但由于以BT和BT(F)为受体单元时,所得的聚合物溶解性不好,所以在分子主链中引入2-己基噻吩作为π桥。以M1和M2为给体单元分别与BTT(6)共聚,得到PBDTT-O-BTT(6)和PBDTT-S-BTT(6)。它们的吸收也仍然在最大光照强度和最大光子通量区域。利用TGA、UV-Vis和CV对它们的性能进行了研究。结果表明,这些聚合物的热分解温度均在300℃以上,具有较好的热稳定性；带隙均在2.0 eV以下,属于窄带系材料；HOMO能级较低,可以获得较高的Voc。以十二种基于BDT的共轭聚合物为给体,以PCBM为受体,制备本体异质结聚合物太阳能电池器件,并研究它们的光伏性能。其中PBDTT-O-TDPP、PBDTT-S-TPD和PBDTT-S-BTT(6)的光伏性能较好,PCE分别达到4.58%、4.63%和5.55%。其中PBDTT-S-BTT(6)的效率最高,说明设计并合成吸收覆盖太阳光最大光强和光通量区域,并且有对太阳光具有较强的响应能力的给体材料,即提高对光子的吸收率是增大PCE的最为有效的方法。
[Abstract]:Solar energy is an inexhaustible clean energy. With the depletion of fossil energy, the environment is deteriorating day by day. Solar cells that can convert solar energy into electric energy have become a new research hotspot. Polymer solar cells have attracted much attention because of their advantages of low cost, light weight and large area devices. Although PCE has now exceeded 10, it is not enough for commercial applications. The design and synthesis of new materials is a research focus of polymer solar cells. In this paper, 2-alkoxy thiophene group and 2-alkylthiothiophene group were introduced into the benzene ring of BDT center, and two donor units M1 and M2 were obtained, and the DPP receptor units M3 and M4 with furan and thiophene as 蟺 bridge were synthesized respectively. M1 and M2 were used as donor units, respectively, by Stille polymerization. Four kinds of polymers absorbed in near infrared region were synthesized by copolymerization with M _ 3N _ 4: PBDTT-O-FDPP, PBDTT-S-FDPP,PBDTT-O-TDPP and PBDTT-S-TDPP; polymerized with TPD to obtain two kinds of polymers with high open-circuit voltage: PBDTT-O-TPD, PBDTT-S-TPD; polymerization with BT and BT (F), four kinds of polymer absorbs in the maximum light intensity and photonic flux region. Domain polymers: PBDTT-O-BT,PBDTT-S-BT,PBDTT-O-BT (F) and PBDTT-S-BT (F). However, due to the poor solubility of the obtained polymers with BT and BT (F) as receptor units, 2-hexylthiophene was introduced as a 蟺 bridge in the main molecular chain. PBDTT-O-BTT (6) and PBDTT-S-BTT (6) were obtained by copolymerization of M1 and M2 with BTT (6), respectively. Their absorption is still in the region of maximum light intensity and maximum photon flux. TGA,UV-Vis and CV are used to study their performance. The results show that the thermal decomposition temperature of these polymers is above 300 鈩，
本文编号：2290388
[Abstract]:Solar energy is an inexhaustible clean energy. With the depletion of fossil energy, the environment is deteriorating day by day. Solar cells that can convert solar energy into electric energy have become a new research hotspot. Polymer solar cells have attracted much attention because of their advantages of low cost, light weight and large area devices. Although PCE has now exceeded 10, it is not enough for commercial applications. The design and synthesis of new materials is a research focus of polymer solar cells. In this paper, 2-alkoxy thiophene group and 2-alkylthiothiophene group were introduced into the benzene ring of BDT center, and two donor units M1 and M2 were obtained, and the DPP receptor units M3 and M4 with furan and thiophene as 蟺 bridge were synthesized respectively. M1 and M2 were used as donor units, respectively, by Stille polymerization. Four kinds of polymers absorbed in near infrared region were synthesized by copolymerization with M _ 3N _ 4: PBDTT-O-FDPP, PBDTT-S-FDPP,PBDTT-O-TDPP and PBDTT-S-TDPP; polymerized with TPD to obtain two kinds of polymers with high open-circuit voltage: PBDTT-O-TPD, PBDTT-S-TPD; polymerization with BT and BT (F), four kinds of polymer absorbs in the maximum light intensity and photonic flux region. Domain polymers: PBDTT-O-BT,PBDTT-S-BT,PBDTT-O-BT (F) and PBDTT-S-BT (F). However, due to the poor solubility of the obtained polymers with BT and BT (F) as receptor units, 2-hexylthiophene was introduced as a 蟺 bridge in the main molecular chain. PBDTT-O-BTT (6) and PBDTT-S-BTT (6) were obtained by copolymerization of M1 and M2 with BTT (6), respectively. Their absorption is still in the region of maximum light intensity and maximum photon flux. TGA,UV-Vis and CV are used to study their performance. The results show that the thermal decomposition temperature of these polymers is above 300 鈩，
本文编号：2290388
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