Synthesis and characterization of D-A-A type regular terpolymers with narrowed band-gap and their application in high performance polymer solar cells
Synthesis and characterization of D-A-A type regular terpolymers with narrowed band-gap and their application in high performance polymer solar cells
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DOI：
10.1016/j.orgel.2016.02.021
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发表时间：
2016-05
影响因子：
3.2
通讯作者：
Dongfeng Dang;Xiaochi Wang;Ying Zhi;L. Meng;X. Bao;Renqiang Yang;Weiguo Zhu
中科院分区：
文献类型：
--
作者：
Dongfeng Dang;Xiaochi Wang;Ying Zhi;L. Meng;X. Bao;Renqiang Yang;Weiguo Zhu
设计合成了两种新型的D-A型规则三元共聚物PBDT-DTQ和PIDT-DTQ，其中以苯并二噻吩和吲哚二噻吩为D单元，喹啉为A单元。由于聚合物主链中强烈的分子内电荷转移效应，所制备的D-A- a型聚合物的吸收光谱比D-A型聚合物宽得多，吸收光谱范围为320 ~ 800 nm，带隙变窄。另一方面，与PBDT-DTQ相比，PIDT-DTQ表现出更深的HOMO能级和更高的载流子迁移率。为了详细研究PBDT-DTQ和PIDT-DTQ的光伏性能，制备了ITO/PEDOT: PSS/有源层/Ca/Al结构的块状异质结聚合物太阳能电池。基于pbdt - dtq的太阳能电池的PCE值为3.84%，而基于pidt - dtq的太阳能电池的PCE值增加了11.42 mA/cm2，Vocof为0.86 V， fft为65.77%，最大PCE值达到6.41%。我们的研究结果表明，使用规则的三聚体作为电子给体材料可以有效地扩大聚合物的吸收并提高psc的光伏性能。
Two novel D-A-A type regular terpolymers of PBDT-DTQ and PIDT-DTQ were designed and synthesized, in which benzodithiophene and indacenodithiophene building blocks were employed as the D unit, and quinoxaline building block was introduced as the A unit. Owing to the strong intra-molecular charge transfer effect in polymer backbone, much broader absorption spectra covering from 320 to 800 nm with the narrowed band-gap were obtained for the developed D-A-A type polymers in contrast to their corresponding D-A type polymers. On the other hand, compared with PBDT-DTQ, PIDT-DTQ exhibited a deeper HOMO energy level and also higher charge carrier mobility. To investigate the photovoltaic properties of PBDT-DTQ and PIDT-DTQ in detail, bulk hetero-junction polymer solar cells with a structure of ITO/PEDOT: PSS/Active Layer/Ca/Al were fabricated. PBDT-DTQ-based solar cells exhibited a moderate PCE value of 3.84%, however, an increasedJscof 11.42 mA/cm2,Vocof 0.86 V andFFof 65.77% was achieved for PIDT-DTQ-based device, leading to the maximum PCE up to 6.41%. Our results here demonstrated that using the regular terpolymers as electron donor materials could be an efficient way to broaden the absorption of polymers and improve the photovoltaic performance of PSCs.