Gopalraman Anantharaj, Karuppuchamy Subbian, Vijayaraghavan Saranyan
Corrosion and Materials Protection Division, CSIR-Central Electrochemical Research Institute Karaikudi Tamil Nadu 630003 India
Academy of Scientific and Innovative Research India.
RSC Adv. 2019 Dec 4;9(69):40292-40300. doi: 10.1039/c9ra08278f. eCollection 2019 Dec 3.
Interfacial modification of the photoanode|electrolyte interface using oleic acid (OA) is thoroughly investigated in this present study. The overall photoconversion efficiency of 11.8% was achieved under the illumination of 100 mW cm with an optical filter of AM 1.5 G. OA molecules were meant to be adsorbed on to the vacant areas of the TiO and the OA moieties leached out the aggregated C106 dye molecules from the TiO surface. There was a strong spectral overlap between the absorption spectrum of donor (OA) and the emission spectrum of acceptor (C106), leading to effective Förster Resonance Energy Transfer (FRET) between OA and C106 and suggested an excellent opportunity to improve the photovoltaic performances of DSSCs. UV-vis DRS and UPS analysis revealed that OA molecules created new surface (mid-gap energy) states (SS) in TiO and these SS played a major role in the electron transport kinetics. Mott-Schottky analysis of DSSCs under dark conditions was carried out to find the shift in the flat band potential of TiO upon OA modification. Surprisingly, no trade off between and was observed after interfacial modification with OA. The dynamics of charge recombination and electron transport at the photoanode|electrolyte interface were studied in detail using electrochemical impedance spectroscopy.
在本研究中，对使用油酸（OA）对光阳极|电解质界面进行界面修饰进行了深入研究。在配备AM 1.5 G滤光片、光照强度为100 mW/cm²的条件下，实现了11.8%的整体光电转换效率。OA分子旨在吸附到TiO₂的空位区域，并且OA部分将聚集的C106染料分子从TiO₂表面浸出。供体（OA）的吸收光谱与受体（C106）的发射光谱之间存在强烈的光谱重叠，导致OA与C106之间发生有效的福斯特共振能量转移（FRET），这为改善染料敏化太阳能电池（DSSC）的光伏性能提供了绝佳机会。紫外可见漫反射光谱（UV-vis DRS）和紫外光电子能谱（UPS）分析表明，OA分子在TiO₂中产生了新的表面（带隙中能量）态（SS），这些表面态在电子传输动力学中起主要作用。在黑暗条件下对DSSC进行莫特-肖特基分析，以研究OA修饰后TiO₂的平带电位的变化。令人惊讶的是，用OA进行界面修饰后，未观察到[此处原文缺失相关内容]与[此处原文缺失相关内容]之间的权衡。使用电化学阻抗谱详细研究了光阳极|电解质界面处的电荷复合和电子传输动力学。
