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Unexpected Impact of N-Alkyl Chain Length in Bis-2-cyanoacrylic Acid Substituted Phenothiazines on the Photovoltaic Response of DSSCs
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-04-08 , DOI: 10.1021/acs.iecr.4c00045
Paweł Gnida 1 , Sylwia Zimosz 2 , Adam Glinka 3 , Marcin Ziółek 3 , Dawid Zych 4 , Sonia Kotowicz 2 , Muhammad Faisal Amin 1, 5 , Pavel Chulkin 6 , Grażyna Kulesza-Matlak 7 , Aneta Slodek 2 , Ewa Schab-Balcerzak 1, 2
Affiliation  

The impact of the alkyl chain on the nitrogen atom─N-ethyl, N-butyl, N-octyl, and N-dodecyl─in phenothiazines with bis-2-cyanoacrylic acid units on the optical and electrochemical behavior and finally photovoltaic response of DSSCs sensitized with such dyes was investigated. Such compounds as alternatives to ruthenium-based dyes were evaluated. The optical properties of the phenothiazine derivatives were studied by UV–vis and photoluminescence measurements in various solutions. Additionally, electronic absorption spectra of dyes anchored to TiO2 were registered. Electrochemical properties were studied by using cyclic and differential pulse voltammetry. Experimental data and the adsorption energies of dyes@TiO2 were supported by DFT and TD-DFT calculations. DSSCs consisting of a TiO2 anode sensitized with prepared dyes, I/I3 electrolyte, and Pt/FTO counter electrode were fabricated. The idea of dye cocktail utilization was also developed. The prepared solar cells were characterized via current–voltage, transient absorption, and electrochemical impedance spectroscopy measurements. Transient absorption spectroscopy revealed a positive effect of the alkyl chain length and cocktail dye configuration on the efficiency of the fast electron transfer processes.

中文翻译:

双-2-氰基丙烯酸取代的吩噻嗪中 N-烷基链长度对 DSSC 光伏响应的意外影响

具有双-2-氰基丙烯酸单元的吩噻嗪中氮原子N-乙基、N-丁基、N-辛基和N-十二烷基上的烷基链对DSSC的光学和电化学行为以及最终光伏响应的影响研究了用此类染料敏化的情况。对此类化合物作为钌基染料的替代品进行了评估。通过紫外-可见光和光致发光测量在各种溶液中研究了吩噻嗪衍生物的光学性质。此外,还记录了固定在TiO 2上的染料的电子吸收光谱。通过使用循环和微分脉冲伏安法研究电化学性质。实验数据和染料@TiO 2的吸附能得到DFT和TD-DFT计算的支持。 DSSC 由用制备的染料敏化的 TiO 2阳极、I - /I 3 -电解质和 Pt/FTO 对电极组成。还提出了染料混合物利用的想法。通过电流-电压、瞬态吸收和电化学阻抗谱测量对制备的太阳能电池进行表征。瞬态吸收光谱揭示了烷基链长度和鸡尾酒染料构型对快速电子转移过程效率的积极影响。
更新日期:2024-04-08
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