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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Improved Performance for Inverted Organic Photovoltaics via Spacer between Benzodithiophene and Benzothiazole in Polymers
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Improved Performance for Inverted Organic Photovoltaics via Spacer between Benzodithiophene and Benzothiazole in Polymers

机译：通过聚合物中苯并二噻吩和苯并噻唑之间的间隔物改善有机光伏反转性能

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In this work, the effects of the spacer between benzo[1,2-b;3,4-b']dithiophene (BDT) and dialkoxybenzothiadiazole (ROBT) in polymers were investigated for applications in organic solar cells. Polymer PBDT-2T-ROBT has a bithiophene (2T) spacer between the BDT and ROBT units, whereas PBDT-ROBT is a direct copolymer of BDT and ROBT. The polymer/PC70BM solar cells using both polymers were fabricated and optimized via polymer/fullerene ratio, solvent, and solvent additives. The spacer has significantly improved solar cell performance from 1.28% (V-oc =0.77 V, J(sc) = 3.13 mA/cm(2), FF = 53.11%) to 5.11% (V-oc = 0.66 V, J(sc) = 13.33 mA/cm(2), FF = 58.12%). The X-ray diffraction (XRD) spectra show the PBDT-2T-ROBT/PC70BM blended film is semicrystalline, whereas the PBDT-ROBT/PC70BM film is amorphous. This indicates that the spacer facilitates polymer organization for higher carrier mobility in the film Atomic force microscopy (AFM) topography and phase images show that PBDT-2T-ROBT/PC70BM films form fibrillar networks, whereas PBDT-ROBT/PC70BM films exhibit larger granular morphology. The photoinduced charge extraction by linearly increasing voltage (Photo-CELIV) measurements show that PBDT-2T-ROBT/PC70BM has a mobility-of 9.59 x 10(-5) cm(2)/(V.s), which is higher than the mobility of 8.64 x 10(-5) cm(2)/(V.s) for PBDT ROBT/PC70BM film.
机译：在这项工作中，研究了聚合物中苯并[1,2-b; 3,4-b']二噻吩（BDT）和二烷氧基苯并噻二唑（ROBT）之间的间隔基在有机太阳能电池中的应用效果。聚合物PBDT-2T-ROBT在BDT和ROBT单元之间有一个噻吩（2T）间隔基，而PBDT-ROBT是BDT和ROBT的直接共聚物。使用这两种聚合物的聚合物/ PC70BM太阳能电池通过聚合物/富勒烯比例，溶剂和溶剂添加剂进行了制造和优化。间隔物将太阳能电池的性能从1.28％（V-oc = 0.77 V，J（sc）= 3.13 mA / cm（2），FF = 53.11％）显着提高到5.11％（V-oc = 0.66 V，J（ sc）= 13.33 mA / cm（2），FF = 58.12％）。 X射线衍射（XRD）光谱显示PBDT-2T-ROBT / PC70BM混合薄膜为半结晶，而PBDT-ROBT / PC70BM混合薄膜为非晶。这表明隔离物有助于聚合物的组织，从而在薄膜中实现更高的载流子迁移率。原子力显微镜（AFM）形貌和相图显示PBDT-2T-ROBT / PC70BM薄膜形成纤维状网络，而PBDT-ROBT / PC70BM薄膜则显示出较大的颗粒形态。通过线性增加电压（Photo-CELIV）测量进行的光诱导电荷提取显示，PBDT-2T-ROBT / PC70BM的迁移率为9.59 x 10（-5）cm（2）/（Vs），高于迁移率对于PBDT ROBT / PC70BM膜为8.64 x 10（-5）cm（2）/（Vs）。

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