Vertically Aligned CdSe Nanowire Arrays for Energy Harvesting and Piezotronic Devices
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- 作者：Yu Sheng Zhou ; Kai Wang ; Weihua Han ; Satish Chandra Rai ; Yan Zhang ; Yong Ding ; Caofeng Pan ; Fang Zhang ; Weilie Zhou ; Zhong Lin Wang
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：July 24, 2012
- 年：2012
- 卷：6
- 期：7
- 页码：6478-6482
- 全文大小：375K
- 年卷期：v.6,no.7(July 24, 2012)
- ISSN：1936-086X
文摘
We demonstrated the energy harvesting potential and piezotronic effect in vertically aligned CdSe nanowire (NW) arrays for the first time. The CdSe NW arrays were grown on a mica substrate by the vapor鈥搇iquid鈥搒olid process using a CdSe thin film as seed layer and platinum as catalyst. High-resolution transmission electron microscopy image and selected area electron diffraction pattern indicate that the CdSe NWs have a wurtzite structure and growth direction along 0001. Using conductive atomic force microscopy (AFM), an average output voltage of 30.7 mV and maximum of 137 mV were obtained. To investigate the effect of strain on electron transport, the current鈥搗oltage characteristics of the NWs were studied by positioning an AFM tip on top of an individual NW. By applying normal force/stress on the NW, the Schottky barrier between the Pt and CdSe was found to be elevated due to the piezotronic effect. With the change of strain of 0.12%, a current decreased from 84 to 17 pA at 2 V bias. This paper shows that the vertical CdSe NW array is a potential candidate for future piezo-phototronic devices.