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000185490 1001_ $$0P:(DE-Juel1)164294$$aTran, Duy P.$$b0$$eCorresponding Author$$ufzj
000185490 245__ $$aPhotoresponsive properties of ultrathin silicon nanowires
000185490 260__ $$aMelville, NY$$bAmerican Inst. of Physics$$c2014
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000185490 520__ $$aFunctional silicon nanowires (SiNWs) are promising building blocks in the design of highly sensitive photodetectors and bio-chemical sensors. We systematically investigate the photoresponse properties of ultrathin SiNWs (20 nm) fabricated using a size-reduction method based on e-beam lithography and tetramethylammonium hydroxide wet-etching. The high-quality SiNWs were able to detect light from the UV to the visible range with excellent sensitivity (∼1 pW/array), good time response, and high photoresponsivity (R ∼ 2.5 × 104 A/W). Improvement of the ultrathin SiNWs' photoresponse has been observed in comparison to 40 nm counter-part nanowires. These properties are attributable to the predominance surface-effect due to the high surface-to-volume ratio of ultrathin SiNWs. Long-term measurements at different temperatures in both the forward and reverse bias directions demonstrated the stability and reliability of the fabricated device. By sensitizing the fabricated SiNW arrays with cadmium telluride quantum dots (QDs), hybrid QD SiNW devices displayed an improvement in photocurrent response under UV light, while preserving their performance in the visible light range. The fast, stable, and high photoresponse of these hybrid nanostructures is promising towards the development of optoelectronic and photovoltaic devices
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000185490 7001_ $$0P:(DE-HGF)0$$aMacdonald, Thomas J.$$b1
000185490 7001_ $$0P:(DE-Juel1)128745$$aWolfrum, Bernhard$$b2$$ufzj
000185490 7001_ $$0P:(DE-Juel1)128733$$aStockmann, Regina$$b3$$ufzj
000185490 7001_ $$0P:(DE-HGF)0$$aNann, Thomas$$b4
000185490 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b5$$ufzj
000185490 7001_ $$0P:(DE-HGF)0$$aThierry, Benjamin$$b6
000185490 773__ $$0PERI:(DE-600)1469436-0$$a10.1063/1.4904089$$gVol. 105, no. 23, p. 231116 -$$n23$$p231116 $$tApplied physics letters$$v105$$x1077-3118$$y2014
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