Au/CdSe hybrid nanoflowers: a high photocurrent generating photoelectrochemical cells
Au/CdSe hybrid nanoflowers: a high photocurrent generating photoelectrochemical cells
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DOI：
10.1007/s13404-018-0247-y
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发表时间：
2018-11
期刊：
影响因子：
2.2
通讯作者：
K. Haldar;Rathindranath Biswas;A. Patra;K. Halder;T. Sen
中科院分区：
文献类型：
--
作者：
K. Haldar;Rathindranath Biswas;A. Patra;K. Halder;T. Sen
研究了由溶液处理的Au核和八个CdSe瓣的纳米花异质结构组成的光电化学电池，以增强光电流的产生。CdSe纳米棒的电极显示出2.1 mA/cm 2的光电流密度，而Au核CdSe纳米花显示出4.6 mA/cm 2，对应于光电化学电池性能期间增加119%。两种电极都表现出对光的开/关周期的快速响应，从生长-衰减曲线计算的光电流增益（I光子/I暗）在CdSe纳米棒中为124.7，而对于Au/CdSe纳米花为223.3。由于增加了66%的入射光子-电流发射，Au/CdSe纳米花样品的光响应时间显著提高。CdSe纳米棒电极和Au/CdSe纳米花电极的电子寿命分别为21.63和48.71 ns。在Au/CdSe纳米花的电极的情况下，延长的电子寿命负责改善电荷分离，并因此产生更高的光电流。
Photoelectrochemical cell composed of solution-processed nanoflower heterostructure of Au core and eight CdSe petals was investigated for enhanced photocurrent generation. The electrode of CdSe nanorods displayed photocurrent density of 2.1 mA/cm2whereas the Au core CdSe nanoflower exhibited 4.6 mA/cm2corresponding to a 119% increase during photoelectrochemical cell performance. Both electrodes showed prompt response to the on/off cycles of light, the photocurrent gain (IPhoton/Idark) in CdSe nanorods is 124.7, while the value is 223.3 for Au/CdSe nanoflower, calculated from the growth-decay curves. Photoresponse time was dramatically improved for Au/CdSe nanoflower samples due to increasing in 66% incident photon-to-current emission. Electron lifetime of 21.63 and 48.71 ns was observed for the electrode of CdSe nanorods and Au/CdSe nanoflowers respectively. The prolonged electron lifetime in the case of the electrode of Au/CdSe nanoflowers was responsible for improving charge separation and as a consequence, higher photocurrent generation.