Cu2S Reduced Graphene Oxide Composite for High-Efficiency Quantum Dot Solar Cells. Overcoming the Redox Limitations of S2-/Sn2- at the Counter Electrode
Cu2S Reduced Graphene Oxide Composite for High-Efficiency Quantum Dot Solar Cells. Overcoming the Redox Limitations of S2-/Sn2- at the Counter Electrode
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DOI：
10.1021/jz201064k
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发表时间：
2011-10-06
影响因子：
5.7
通讯作者：
Kamat, Prashant V.
中科院分区：
文献类型：
--
作者：
Radich, James G.;Dwyer, Ryan;Kamat, Prashant V.
在量子点敏化太阳能电池中用作氧化还原电解质的多硫化物电解质为镉硫属化物光阳极提供稳定性，但通过不期望的表面反应在对电极处引入显著的氧化还原限制。通过设计还原氧化石墨烯（RGO）-Cu 2S复合材料，我们现在已经成功地使电子穿梭通过RGO片和多硫化物活性Cu 2S，比Pt电极更有效，将填充因子提高了75%。在不同组成下表征和优化的复合材料表明，Cu/RGO质量比为4提供了最佳的电化学性能。使用优化的RGO-Cu 2S复合对电极构建的夹层CdSe量子点敏化太阳能电池表现出4.4%的无与伦比的功率转换效率。
Polysulfide electrolyte that is employed as a redox electrolyte in quantum dot sensitized solar cells provides stability to the cadmium chalcogenide photoanode but introduces significant redox limitations at the counter electrode through undesirable surface reactions. By designing reduced graphene oxide (RGO)-Cu2S composite, we have now succeeded in shuttling electrons through the RGO sheets and polysulfide-active Cu2S more efficiently than Pt electrode, improving the fill factor by similar to 75%. The composite material characterized and optimized at different compositions indicates a Cu/RGO mass ratio of 4 provides the best electrochemical performance. A sandwich CdSe quantum dot sensitized solar cell constructed using the optimized RGO-Cu2S composite counter electrode exhibited an unsurpassed power conversion efficiency of 4.4%.SECTION: Energy Conversion and Storage