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A detailed evaluation of charge recombination dynamics in dye solar cells based on starburst triphenylamine dyes†
Sustainable Energy & Fuels ( IF 5.6 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1039/c7se00257b
Manikkedath V. Vinayak 1, 2, 3, 4, 5 , Muhammed Yoosuf 1, 2, 3, 4, 5 , Sourava C. Pradhan 1, 2, 3, 4, 5 , Thyagarajan M. Lakshmykanth 1, 2, 3, 4, 5 , Suraj Soman 1, 2, 3, 4, 5 , Karical R. Gopidas 1, 2, 3, 4, 5
Affiliation  

Understanding the charge transfer dynamics in dye solar cells (DSCs) is imperative for the development of highly efficient devices. The loss in photocurrent due to recombination can be alleviated by removing holes formed in the oxidized dye molecules away from the TiO2 surface and also by preventing the oxidized species in the electrolyte from coming near the semiconductor. Focusing on elucidating these two parameters we fabricated I/I3 electrolyte based dye solar cells with two novel branched propeller shaped triphenylamine dyes TPAA4 and TPAA5 with broader absorption and higher molar extinction coefficient, which showed power conversion efficiencies of 6.52% and 4.60% respectively. The bulkiness of the co-donor along with the triple bond bridges provided further rigidity to the structure, thereby reducing aggregation of the dyes on the TiO2 surface. Both the dyes were structurally engineered in such a way to avoid the recombination of electrons from TiO2. Detailed charge transfer dynamics of the devices were studied by employing extensive perturbation techniques such as electrochemical impedance spectroscopy (EIS), charge extraction (CE) and intensity-modulated photovoltage spectroscopy (IMVS).

中文翻译:

基于星爆三苯胺染料的染料太阳能电池中电荷重组动力学的详细评估

了解染料太阳能电池(DSC)中的电荷转移动力学对于开发高效器件至关重要。通过去除远离TiO 2表面的氧化染料分子中形成的空穴,并且还通过防止电解质中的氧化物质靠近半导体,可以减轻由于重组引起的光电流损失。重点放在阐明我们制造了我这两个参数- / I 3 -电解质基于染料太阳能电池具有两个新颖的支链螺旋桨状三苯基胺染料TPAA4TPAA5具有更宽的吸收率和更高的摩尔消光系数,功率转换效率分别为6.52%和4.60%。共给体的庞大性以及三键桥为该结构提供了进一步的刚性,从而减少了染料在TiO 2表面上的聚集。两种染料都经过结构化设计,可避免TiO 2中的电子复合。通过采用广泛的摄动技术,例如电化学阻抗谱(EIS),电荷提取(CE)和强度调制的光电压谱(IMVS),研究了器件的详细电荷转移动力学。
更新日期:2017-11-07
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