Synthesis of pi-Extended Dithienobenzodithiophene-Containing Medium Bandgap Copolymers and Their Photovoltaic Application
Synthesis of pi-Extended Dithienobenzodithiophene-Containing Medium Bandgap Copolymers and Their Photovoltaic Application
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π-延伸型二噻吩并苯并二噻吩中带隙共聚物的合成及其光伏应用
DOI：
10.1080/10601325.2015.1080103
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发表时间：
2015
影响因子：
2.5
通讯作者：
Xia Yangjun
中科院分区：
文献类型：
--
作者：
Tong Junfeng;Li Mingjiao;An Lili;Li Jianfeng;Xu Xinghua;Zhang Peng;Yang Chunyan;Wang Feng;Xia Yangjun
两种中等带隙交替共轭共聚物，即聚{5,10-二(2-己基癸氧基)二噻吩并[2,3-d:20,30-d0]苯并[1,2-.b:4,5-b0]二噻吩-2,7-二基-交替噻吩-2,5-二基}（P1）和采用钯催化Stille缩聚反应制备了聚{5,10-二(2-己基癸氧基)二噻吩并[2,3-d:20,30-d0]苯并[1,2-b:4,5-.b0]二噻吩-2,7-二基-交替噻吩并[3,2-b]噻吩-2,5-二基}(P2)。通过凝胶渗透色谱（GPC）、紫外-可见吸收和光致发光（PL）光谱、热重分析（TGA）、循环伏安法（CV）等进行分析。所得共聚物在常见有机溶剂中表现出适度的溶解度，并且具有足够的光伏应用稳定性。两种共聚物都吸收 300–600 nm 范围内的太阳光，光学带隙 (Eopt.g ) 根据固体膜中吸收开始时计算得出。 2.1电子伏特。由CV测定的两种共聚物的最高占据分子轨道(HOMO)能级约为¡5.35 eV。以聚合物为供体，[6,6]-苯基-C71丁酸甲酯(PC71BM)为受体，聚合物与PC71BM的重量比为1:2，研究了聚合物的光伏性能。在AM1.5、100 mW cm¡2光照下，基于PDTBTT-TT的聚合物太阳能电池的功率转换效率（PCE）达到2.50%，开路电压（Voc）为0.70 V，短路电流密度（Jsc）为6.89 mA cm¡2，填充因子（FF）为52%。这些结果表明二噻吩并[2,3-d:20,30-d0]苯并[1,2-b:4,5-b0]二噻吩（DTBDT）是高性能有机电子材料的有前途的构建单元。
Two medium bandgap alternating conjugated copolymers, namely, poly{5,10-di(2-hexyldecyloxy)dithieno[2,3-d:20,30-d0]benzo[1,2-.b:4,5-b0]dithiophene-2,7-diyl-alt-thiophene-2,5-di-yl} (P1) and poly{5,10-di(2-hexyldecyloxy)dithieno[2,3-d:20,30-d0]benzo[1,2-b:4,5-.b0]dithiophene-2,7-di-yl-alt-thieno[3,2-b]thiophene-2,5-diyl} (P2), were prepared by the palladium-catalyzed Stille polycondensation.and characterized by gel permeation chromatography (GPC), UV-Vis absorption and photoluminescence (PL) spectra, thermal.gravimetric analysis (TGA), cyclic voltammetry (CV) etc. The resultant copolymers show moderate solubility in common organic.solvents and enough stabilities for photovoltaic application. And both copolymers absorb the solar light from 300–600 nm, with the.optical band gaps (Eopt.g ) calculated from the onset of absorption in the solid film of ca. 2.1 eV. The highest occupied molecular orbital.(HOMO) levels of two copolymers determined by CV were at about ¡5.35 eV. Photovoltaic propertites of the polymers were investigated.by using the polymers as donor and [6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) as acceptor with a weight ratio of.polymer:PC71BM of 1:2. The power conversion efficiencies (PCEs) of polymer solar cells based on PDTBTT-TT reached 2.50%,.with an open-circuit voltage (Voc) of 0.70 V, a short-circuit current density (Jsc) of 6.89 mA cm¡2, and a fill factor (FF) of 52%, under.the illumination of AM1.5, 100 mW cm¡2. These results indicate that dithieno[2,3-d:20,30-d0]benzo[1,2-b:4,5-b0]dithiophene.(DTBDT) is a promising building block for the high-performance organic electronic materials.