Indenoquinaldine-Based Unsymmetrical Squaraine Dyes for Near-Infrared Absorption: Investigating the Steric and Electronic Effects in Dye-Sensitized Solar Cells
Indenoquinaldine-Based Unsymmetrical Squaraine Dyes for Near-Infrared Absorption: Investigating the Steric and Electronic Effects in Dye-Sensitized Solar Cells
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DOI：
10.1002/chem.201803062
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发表时间：
2018-11-02
影响因子：
4.3
通讯作者：
Nithyanandhan, Jayaraj
中科院分区：
文献类型：
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作者：
Bisht, Rajesh;Kavungathodi, Munavvar Fairoos Mele;Nithyanandhan, Jayaraj
设计并合成了一系列近红外响应的不对称方酸菁染料（ISQ 1 -3）。将C-12烷基链以面外取向掺入茚并喹哪啶的茚单元的sp（3）-杂化碳中心以控制二氧化钛表面上的染料聚集，并将吲哚（ISQ 1）、苯并[e]吲哚（ISQ 2）、和喹啉（ISQ 3）部分被包括作为带有锚定羧基的供体组分，以扩展NIR区域中的吸收，并系统地研究其作用电子修饰对染料敏化太阳能电池（DSSC）性能的影响。所有染料在近红外区都表现出强吸收（λ>= 10（5）m（-1）cm（-1）），染料吸附的TiO 2薄膜表现出宽的全色吸收。基于ISQ 3的DSSC器件的入射光子电流效率（IPCE）光谱显示了高达880 nm的全色IPCE响应。此外，ISQ 3敏化的器件在10当量的3 α，7 α-二羟基-5 β-胆烷酸（CDCA）的存在下提供了4.15%的最佳效率，短路电流密度（J（SC））为10.02 mA cm（-2），开路电压（V-OC）为0.58 V，填充因子（ff）为72%。电化学阻抗谱分析表明，ISQ 3敏化的DSSC中的电荷复合减弱，这有助于其与其他染料相比更高的V-OC值。
A series of near-infrared (NIR)-responsive unsymmetrical squaraine dyes (ISQ1-3) incorporating a fused indenoquinaldine-based donor have been designed and synthesized. C-12 alkyl chains were incorporated at the sp(3)-hybridized carbon center of the indene unit of the indenoquinaldine in an out-of-plane orientation to control dye aggregation on the surface of titanium dioxide, and indole (ISQ1), benzo[e]indole (ISQ2), and quinoline (ISQ3) moieties were included as the donor component bearing the anchoring carboxy group to extend the absorption in the NIR region and to systematically study the effect of the electronic modification on the performance of dye-sensitized solar cells (DSSC). All the dyes exhibit intense absorption (epsilon >= 10(5) m(-1) cm(-1)) in the NIR region, and the dye-adsorbed TiO2 films exhibit broad panchromatic absorption. The incident photon-to-current efficiency (IPCE) spectrum of the ISQ3-based DSSC device displays a panchromatic IPCE response up to 880 nm. Additionally, the ISQ3-sensitized device provides the best efficiency of 4.15% with a short circuit current density (J(SC)) of 10.02 mA cm(-2), open-circuit voltage (V-OC) of 0.58V, and fill factor (ff) of 72% in the presence of 10 equivalents of 3 alpha,7 alpha-dihydroxy-5 beta-cholanic acid (CDCA). Electrochemical impedance spectroscopy analysis showed attenuated charge recombination in the ISQ3-sensitized DSSC, which contributes to its higher value of V-OC compared with the other dyes.