基于苯并二噻吩和萘并噻吩单元的有机光伏材料的合成与性能研究
发布时间：2019-04-27 12:14
【摘要】：有机太阳能电池(OSCs),由于原材料来源丰富、质量轻、成本低、可制备大面积柔性薄膜电池组件等优点,已成为世界各国新能源开发与利用的重要方向。本论文系统阐述了有机太阳能电池的发展进程,并着重介绍了苯并噻吩衍生物在有机太阳能电池供体材料上的应用。针对当前有机太阳能电池供体材料载流子迁移率及能量转换效率偏低等缺点,本论文在供体材料内引入大平面苯并噻吩衍生物(苯并二噻吩和萘并噻吩单元),有效提高了分子间的π-π堆积性能和自组装行为,最终提高了供体材料载流子迁移率及能量转换效率。设计合成了4个有机光伏供体材料,系统研究了供体材料的分子结构对电池器件性能的影响,研究内容如下:1.设计并合成了一类主链给体-共轭侧链受体的D-A型共轭聚合物PIDTBDTID和PIDTBDT(ID)2,以苯并二噻吩(BDT)及引达省并二噻吩(IDT)单元为主链给体(D)单元,噻吩乙烯为链接,在侧链末端引入单/双异靛蓝(ID)受体单元。系统研究了聚合物的热稳定性、光物理、电化学及光伏性能。研究发现:侧链挂接一个ID单元的共聚物PIDTBDTID表现出更好的光吸收性能和电荷传输能力,其光伏器件能量转换效率(PCE)相对较高(2.66%);挂接两个ID单元的共聚物PIDTBDT(ID)2展现出了更低的最高被占用分子轨道能级(HOMO能级),光伏器件的开路电压达到0.93 V。2.设计合成了以4,9-二(噻吩-2-基)萘并[2,3-b]噻吩(DTNT)为给体D单元,吡咯并吡咯二酮(DPP)为受体A单元,菲(PN)为端基单元,新型有机小分子供体材料DTNT-3DPP和DTNT(DPP-PN)_3。研究发现:DTNT-3DPP和DTNT(DPP-PN)_3在分子平面性、光吸收和电荷传输性能方面均优于文献报道的基于三苯胺(TPA)为中心的星型小分子TPA-3DPP和TPA(DPP-PN)_3,基于DTNT-3DPP和DTNT(DPP-PN)_3的光伏器件PCE分别为3.47和3.69%,其中基于DTNT-3DPP的光伏器件PCE值是TPA-3DPP的1.82倍。这说明相对于TPA,新型DTNT给体D单元有利于改善供体分子平面性,提高材料光伏性能。
[Abstract]:Due to the advantages of abundant raw materials, light weight and low cost, organic solar cell (OSCs),) has become an important direction of new energy development and utilization in the world because of its advantages such as preparing large-area flexible thin film cell modules and so on. In this paper, the development of organic solar cells is systematically described, and the application of benzothiophene derivatives in donor materials of organic solar cells is emphatically introduced. In order to overcome the disadvantages of low carrier mobility and energy conversion efficiency of organic solar cell donor materials, large plane benzothiophene derivatives (benzothiophene and naphthothiophene units) were introduced into the donor materials in this paper. The 蟺-蟺 stacking performance and self-assembly behavior of the donor materials were improved effectively, and the carrier mobility and energy conversion efficiency of the donor materials were finally improved. Four organic photovoltaic donor materials were designed and synthesized. The effects of the molecular structure of the donor materials on the performance of cell devices were systematically studied. The contents are as follows: 1. A class of D-A conjugated polymers, PIDTBDTID and PIDTBDT (ID)-2, of main chain donor-conjugated side chain receptors were designed and synthesized. The main chain donor (D) units were benzodithiophene (BDT) and Dithiophene (IDT) units. Thiophene ethylene as a link, at the end of the side chain introduced a single / double isoindigo (ID) receptor unit. The thermal stability, photophysical, electrochemical and photovoltaic properties of the polymers were systematically studied. It is found that the copolymer PIDTBDTID with a side chain attached to a ID unit exhibits better optical absorption performance and charge transfer ability, and the energy conversion efficiency of photovoltaic devices is relatively high (2.66%), and the energy conversion efficiency of photovoltaic devices is higher than that of photovoltaic devices (2.66%). The copolymer PIDTBDT (ID) 2 with two ID units shows a lower maximum occupied molecular orbital energy level (HOMO energy level), and the open circuit voltage of photovoltaic devices is 0.93V.2. Using 4,9-bis (thiophene-2-yl) naphtho [2,3 渭 b] thiophene (DTNT) as donor D unit, pyrrole pyrrolidone (DPP) as receptor A unit and phenanthrene (PN) as terminal unit, we designed and synthesized 4,9-bis (thiophene-2-yl) naphtho [2,3 渭 b] thiophene as donor D unit. New Organic small Molecular donor Materials DTNT-3DPP and DTNT (DPP-PN) _ 3. It is found that DTNT-3DPP and DTNT (DPP-PN) _ 3 are superior to TPA-3DPP and TPA (DPP-PN) _ 3 in molecular planarity, light absorption and charge transfer, which are based on triphenylamine (TPA). The PCE of photovoltaic devices based on DTNT-3DPP and DTNT (DPP-PN) _ 3 is 3.47% and 3.69%, respectively. Among them, the PCE value of photovoltaic devices based on DTNT-3DPP is 1.82 times higher than that of TPA-3DPP. This shows that compared with the new DTNT donor D unit of TPA, the donor molecular planarity is improved and the photovoltaic performance of the material is improved.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM914.4;O626.12
本文编号：2466976
[Abstract]:Due to the advantages of abundant raw materials, light weight and low cost, organic solar cell (OSCs),) has become an important direction of new energy development and utilization in the world because of its advantages such as preparing large-area flexible thin film cell modules and so on. In this paper, the development of organic solar cells is systematically described, and the application of benzothiophene derivatives in donor materials of organic solar cells is emphatically introduced. In order to overcome the disadvantages of low carrier mobility and energy conversion efficiency of organic solar cell donor materials, large plane benzothiophene derivatives (benzothiophene and naphthothiophene units) were introduced into the donor materials in this paper. The 蟺-蟺 stacking performance and self-assembly behavior of the donor materials were improved effectively, and the carrier mobility and energy conversion efficiency of the donor materials were finally improved. Four organic photovoltaic donor materials were designed and synthesized. The effects of the molecular structure of the donor materials on the performance of cell devices were systematically studied. The contents are as follows: 1. A class of D-A conjugated polymers, PIDTBDTID and PIDTBDT (ID)-2, of main chain donor-conjugated side chain receptors were designed and synthesized. The main chain donor (D) units were benzodithiophene (BDT) and Dithiophene (IDT) units. Thiophene ethylene as a link, at the end of the side chain introduced a single / double isoindigo (ID) receptor unit. The thermal stability, photophysical, electrochemical and photovoltaic properties of the polymers were systematically studied. It is found that the copolymer PIDTBDTID with a side chain attached to a ID unit exhibits better optical absorption performance and charge transfer ability, and the energy conversion efficiency of photovoltaic devices is relatively high (2.66%), and the energy conversion efficiency of photovoltaic devices is higher than that of photovoltaic devices (2.66%). The copolymer PIDTBDT (ID) 2 with two ID units shows a lower maximum occupied molecular orbital energy level (HOMO energy level), and the open circuit voltage of photovoltaic devices is 0.93V.2. Using 4,9-bis (thiophene-2-yl) naphtho [2,3 渭 b] thiophene (DTNT) as donor D unit, pyrrole pyrrolidone (DPP) as receptor A unit and phenanthrene (PN) as terminal unit, we designed and synthesized 4,9-bis (thiophene-2-yl) naphtho [2,3 渭 b] thiophene as donor D unit. New Organic small Molecular donor Materials DTNT-3DPP and DTNT (DPP-PN) _ 3. It is found that DTNT-3DPP and DTNT (DPP-PN) _ 3 are superior to TPA-3DPP and TPA (DPP-PN) _ 3 in molecular planarity, light absorption and charge transfer, which are based on triphenylamine (TPA). The PCE of photovoltaic devices based on DTNT-3DPP and DTNT (DPP-PN) _ 3 is 3.47% and 3.69%, respectively. Among them, the PCE value of photovoltaic devices based on DTNT-3DPP is 1.82 times higher than that of TPA-3DPP. This shows that compared with the new DTNT donor D unit of TPA, the donor molecular planarity is improved and the photovoltaic performance of the material is improved.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM914.4;O626.12
【参考文献】
相关期刊论文 前3条
1 张敬爽;胡湛晗;王美丽;张静;刘红云;刘婕;;太阳能电池研究进展[J];化工新型材料;2016年11期
2 赖衍帮;丁益民;王洪宇;;苯并[1,2-b:4,5-b']二噻吩的结构修饰及在有机光伏材料中的应用[J];化学进展;2014年10期
3 李针英;孙建平;王亮;周小波;凌启淡;;基于苯并二噻吩的D-A型窄带隙共轭聚合物在太阳能电池中的应用[J];高分子通报;2013年03期
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