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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Efficient Structural Modification of Triphenylamine-Based Organic Dyes for Dye-Sensitized Solar Cells
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Efficient Structural Modification of Triphenylamine-Based Organic Dyes for Dye-Sensitized Solar Cells

机译：染料敏化太阳能电池的三苯胺基有机染料的高效结构改性

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摘要

A series of new organic D—π—A dyes, coded as DS-1, DS-2, DS-3, and DS-4, was designed, synthesized, and characterized by ~1H NMR,~(13)C NMR, infrared spectroscopy, mass spectrometry, and elemental analysis. These dyes consist of a di(p-tolyl)phenylamine moiety as an electron donor, a cyanoacetic acid moiety as an electron acceptor/anchoring group, and different types of conducting thiophene units as electron spacers to bridge the donor and acceptor. It was found that both the use of di(p-tolyl)phenylamine donor and the variation of eleptron spacers in the D—π—A dyes played an essential role in modifying and/or tuning physical properties of organic dyes. These dyes were developed as sensitizers for the application in dye-sensitized TiO2 nanocrystalline solar cells (DSSCs), and their photophysical and electrochemical properties were investigated. The DSSCs based on the dyes gave good performance in terms of incident photon-to-current conversion efficiency (IPCE) in the range of 400—700 nm. A solar-energy-to-electricity conversion efficiency (η) of 7.00% was obtained with the DSSC based on 5-[[2-[p-(di-p-tolylamino)]styryl]thiophene-yl]thiophene-2-cyanoacrylic acid (DS-2) under simulated AM 1.5 G irradiation (100 mW/cm~2): short-circuit current density (J_(sc)) of 15.3 mA cm~(-2); open-circuit voltage (V_(oc)) of 0.633 V; fill factor (FF) of 0.725. The density functional theory (DFT) calculation suggests that the electron-transfer distribution moves from the donor unit to the acceptor under light irradiation, which means efficient intramolecular charge transfer.
机译：设计，合成了一系列新型有机D-π-A染料，分别编码为DS-1，DS-2，DS-3和DS-4，并通过〜1H NMR，〜（13）C NMR进行了表征，红外光谱，质谱和元素分析。这些染料由作为电子供体的二（对甲苯基）苯胺部分，作为电子受体/固定基团的氰基乙酸部分和不同类型的导电噻吩单元作为电子间隔基以桥接供体和受体组成。发现使用二（对甲苯基）苯胺供体和D-π-A染料中的电子间隔基的变化在改变和/或调节有机染料的物理性质方面都起着至关重要的作用。这些染料被开发为用于染料敏化的TiO2纳米晶体太阳能电池（DSSCs）的敏化剂，并研究了它们的光物理和电化学性能。基于染料的DSSC在400-700 nm范围内的入射光子-电流转换效率（IPCE）方面具有良好的性能。基于5-[[2- [p-（二-（对-to-甲苯基氨基）]苯乙烯基]噻吩基]噻吩-2-基的DSSC获得7.00％的太阳能转换效率（η）模拟AM 1.5 G辐照（100 mW / cm〜2）时的氰基丙烯酸（DS-2）：短路电流密度（J_（sc））为15.3 mA cm〜（-2）;开路电压（V_（oc））为0.633 V;填充系数（FF）为0.725。密度泛函理论（DFT）的计算表明，在光照射下，电子转移分布从供体单元转移到受体，这意味着分子内电荷有效转移。

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