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Cobalt sulfide counter electrode using hydrothermal method for quantum dot-sensitized solar cells

机译:水热法量子点敏化太阳能电池用硫化钴对电极

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摘要

Chalcogenides are potential alternatives to platinum (Pt) based counter electrode (CE). This study reports cobalt sulfide (CoS2) thin films as robust, high-performance, economical, earth-abundant CE for quantum dot-sensitized solar cells (QDSSCs). CoS2 thin film has been deposited on a fluorine-doped tin oxide substrate by a hydro thermal method using 3-mercapto propionic acid and used as an efficient CE for polysulfide redox reactions in quantum dot-sensitized solar cells (QDSSCs). CdS/CdSe-sensitized QDSSCs exploiting CoS2 CE improved short-circuit photocurrent density and fill factor. We attained 2.27% solar light-to-electricity conversion efficiency, a value higher than reaped with Pt CE (1.73%). Electrochemical measurements testified that CoS2 reveals high electro-catalytic activity towards polysulfide reduction, thus accelerating QDSSCs performance. CoS2 also showed stability at a working state for over 10 h, resulting in highly reproducible performance, which is a serious challenge for solar cell. (C) 2015 Elsevier B.V. All rights reserved.
机译:硫族化物是基于铂(Pt)的对电极(CE)的潜在替代品。这项研究报告了硫化钴(CoS2)薄膜作为量子点敏化太阳能电池(QDSSC)的可靠,高性能,经济,地球上丰富的CE。 CoS2薄膜已通过使用3-巯基丙酸的水热法沉积在掺氟的氧化锡基板上,并已用作量子点敏化太阳能电池(QDSSC)中多硫化物氧化还原反应的有效CE。利用CoS2 CE的CdS / CdSe敏化QDSSC改善了短路光电流密度和填充因子。我们实现了2.27%的太阳能光电转换效率,该值高于使用Pt CE获得的光电转换效率(1.73%)。电化学测量证明,CoS2对多硫化物的还原显示出高电催化活性,从而加快了QDSSC的性能。 CoS2还显示出在工作状态下超过10小时的稳定性,从而导致了高度可重复的性能,这对于太阳能电池而言是一个严峻的挑战。 (C)2015 Elsevier B.V.保留所有权利。

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