A thieno[3,4-f]isoindole-5,7-dione based copolymer for polymer solar cells
A thieno[3,4-f]isoindole-5,7-dione based copolymer for polymer solar cells
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用于聚合物太阳能电池的噻吩并[3,4-f]异吲哚-5,7-二酮共聚物
DOI：
10.1039/c2py20674a
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发表时间：
2013-01
影响因子：
4.6
通讯作者：
Jianhui Hou
中科院分区：
文献类型：
--
作者：
Yue Wu;Yan Jing;Xia Guo;Shaoqing Zhang;Maojie Zhang;Lijun Huo;Jianhui Hou
设计并合成了一种基于噻吩并[3，4-f]异吲哚-5，7-二酮（TID）和苯并[1，2-B：4，5-B]二噻吩的新型聚合物。通过元素分析、凝胶渗透色谱（GPC）、热重分析（TGA）、差示扫描量热法（DSC）、紫外-可见（UV-vis）吸收光谱和电化学循环伏安（CV）测试对共聚物进行了表征。与PBDTTPD相比，醌型单元的引入可以提高聚合物的HOMO能级，降低LUMO能级，从而可以非常有效地降低带隙。在B3 LYP/6- 31 G水平上对两种聚合物的电子结构进行了密度泛函理论计算.当使用3%（v/v）二碘辛烷（DIO）作为溶剂添加剂用PBDTTID和PC61 BM的共混物的活性层制造聚合物太阳能电池（PSC）器件时，获得0.80V的高Voc，在AM 1.5G条件下PCE为3.12%。基于PBDTTID的PSC器件显示出比基于PBDTTPD的PSC器件略低的Voc但更好的Jsc和FF，并且初步结果表明TID将是用于设计具有低HOMO能级以及低带隙的光伏聚合物的理想构建块。
A new polymer based on thieno[3,4-f]isoindole-5,7-dione (TID) and benzo[1,2-b:4,5-b]dithiophene was designed and synthesized. The copolymer was characterized by elemental analysis, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), ultraviolet-visible (UV-vis) absorption spectra as well as electrochemical cyclic voltammetry (CV) tests. Compared to PBDTTPD, introducing the quinoid unit could elevate the HOMO energy level and lower the LUMO energy level of the polymer, and consequently, the band gap can be reduced very effectively. The electronic structures of the two polymers were also studied by DFT calculations at the B3LYP/6-31G level. When a polymer solar cell (PSC) device was fabricated with an active layer of a blend of PBDTTID and PC61BM using 3% (v/v) diiodooctane (DIO) as a solvent additive, a high Voc of 0.80 V was obtained, with a PCE of 3.12% under AM 1.5G conditions. The PBDTTID-based PSC device shows a slightly lower Voc but better Jsc and FF than the PBDTTPD-based PSC device, and the preliminary results indicate that TID will be a desirable building block for designing photovoltaic polymers with low-lying HOMO energy levels, as well as low band gaps.
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