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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >An ester-functionalized diketopyrrolopyrrole molecule with appropriate energy levels for application in solution-processed organic solar cells
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An ester-functionalized diketopyrrolopyrrole molecule with appropriate energy levels for application in solution-processed organic solar cells

机译：具有适当能级的酯官能化二酮吡咯并吡咯分子，可用于溶液处理的有机太阳能电池

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摘要

For highly efficient organic solar cells (OSCs), the electron donor should possess not only a narrow band gap (Eg) but also a low highest occupied molecular orbital (HOMO) energy level. To achieve it, in this paper, we designed and synthesized a diketopyrrolopyrrole (DPP) derivative end capped with an ethyl thiophene-2-carboxylate moiety, 3,6-bis{5-[(ethyl thiophene-2-carboxylate)-2-yl]thiophene-2-yl}-2,5-bis(2-ethylhexyl) pyrrolo[3,4-c]pyrrole-1,4-dione (DPP(CT)2). Through UV-vis absorption and cyclic voltammetry (CV) measurements, we demonstrated that the resulting molecule exhibits both a low optical E_g of 1.65 eV and a lower-lying HOMO energy level of -5.33 eV owing to the electronegativity of the ester group and the conjugation effect of the thiophene ring. Therefore, when DPP(CT)2 is used as the electron donor to blend with [6,6]-phenyl-C_(71)-butyric acid methyl ester (PC71BM) for solution processable OSCs, a power conversion efficiency (PCE) of 4.02% combined with an open-circuit voltage (VOc) as high as 0.94 V and a broad photovoltaic response range extending to around 750 nm is obtained.
机译：对于高效有机太阳能电池（OSC），电子给体不仅应具有窄的带隙（Eg），而且应具有较低的最高占据分子轨道（HOMO）能量水平。为此，在本文中，我们设计并合成了一个由噻吩-2-羧酸乙酯部分3,6-双{5-[（噻吩-2-羧酸乙酯）-2-封端的二酮吡咯并吡咯（DPP）衍生物基]噻吩-2-基} -2,5-双（2-乙基己基）吡咯并[3,4-c]吡咯-1,4-二酮（DPP（CT）2）。通过紫外可见吸收和循环伏安法（CV）测量，我们证明，由于酯基团和分子团的电负性，所得分子既显示1.65 eV的低光学E_g，又显示-5.33 eV的较低HOMO能级。噻吩环的共轭作用。因此，当DPP（CT）2用作电子供体与[6,6]-苯基-C_（71）-丁酸甲酯（PC71BM）混合以制备溶液可加工OSC时，功率转换效率（PCE）为获得4.02％的电压和高达0.94 V的开路电压（VOc），并获得了扩展到750 nm左右的较宽光伏响应范围。

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