Photo-enhanced catalytic activity of spray-coated Cu2SnSe3 nanoparticle counter electrode for dye-sensitised solar cells
Photo-enhanced catalytic activity of spray-coated Cu2SnSe3 nanoparticle counter electrode for dye-sensitised solar cells
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DOI：
10.1002/pssr.201600207
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发表时间：
2016-10-01
影响因子：
2.8
通讯作者：
Briscoe, Joe
中科院分区：
文献类型：
--
作者：
Ananthakumar, Soosaimanickam;Li, Xuan;Briscoe, Joe
使用油胺作为溶剂和封端剂合成Cu2SnSe3纳米颗粒，并使用地球丰富的元素喷涂以形成染料敏化太阳能电池（DSSC）对电极（CE）。该薄膜只需要在氮气中在400摄氏度下退火，这比之前报道的Cu（2）SnSe（3）和Cu2ZnSnSe4薄膜都要低，也避免了使用Se气体。材料的成分和物相确定为锌黄锡矿Cu2SnSe3。使用Cu2SnSe3 CE的DSSC给出4.87%的功率转换效率，相比之下，使用Pt时为5.35%。电化学阻抗谱表明，在光照下的Cu2SnSe3 CE的性能增强，导致电荷转移电阻下降。这种光照诱导的催化活性增强为DSSC中CE性能的增强提供了一种新的机制。纳米结构Cu2SnSe3对电极的光激发为电解质还原提供了更高的过电位，从而提高了催化性能。
Cu2SnSe3 nanoparticles are synthesised using oleylamine as both a solvent and capping agent and spray coated to form dye-sensitised solar cell (DSSC) counter electrodes (CEs) using earth-abundant elements. The film requires annealing at only 400 degrees C in nitrogen, which is a lower temperature than previous reports of both Cu(2)SnSe(3)and Cu2ZnSnSe4 films, also avoiding the use of Se gas. The composition and phase of the material is confirmed to be kesterite Cu2SnSe3. DSSCs using Cu2SnSe3 CEs give a power conversion efficiency of 4.87%, compared to 5.35% when using Pt. Electrochemical impedance spectroscopy indicates that the performance of the Cu2SnSe3 CE is enhanced under illumination, leading to a drop in the charge transfer resistance. This illumination-induced enhancement of the catalytic activity provides a novel mechanism for the enhancement of CE performance in DSSCs.[GRAPHICS]Photo-excitation of the nanostructured Cu2SnSe3 counter electrode provides a higher overpotential for electrolyte reduction, giving improved catalytic performance.