Dependence of photocurrent in single-crystalline boron nanobelts on atmosphere
Dependence of photocurrent in single-crystalline boron nanobelts on atmosphere
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DOI：
10.1063/1.2404609
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发表时间：
2006-12
影响因子：
4
通讯作者：
K. Kirihara;Kenji Kawaguchi;Y. Shimizu;T. Sasaki;N. Koshizaki;K. Soga;K. Kimura
中科院分区：
文献类型：
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作者：
K. Kirihara;Kenji Kawaguchi;Y. Shimizu;T. Sasaki;N. Koshizaki;K. Soga;K. Kimura
这封信描述了单晶硼纳米带的光电流对大气的依赖性。在环境空气中，在蓝光照射下观察到缓慢的光响应。上升和下降的时间超过三天。环境空气和氧气中的光响应幅度大于氢气和氩气中的光响应幅度。在真空中，观察到蓝光照射下电导持续下降的光电阻效应。由于氧和水分子的吸附或解吸，纳米带表面的能带弯曲变化似乎通过在纳米带核心和表面分别捕获和重组光激发载流子来开关光导。这封信描述了单晶硼纳米带的光电流对大气的依赖性。在环境空气中，在蓝光照射下观察到缓慢的光响应。上升和下降的时间超过三天。环境空气和氧气中的光响应幅度大于氢气和氩气中的光响应幅度。在真空中，观察到蓝光照射下电导持续下降的光电阻效应。由于氧和水分子的吸附或解吸，纳米带表面的能带弯曲变化似乎通过在纳米带核心和表面分别捕获和重组光激发载流子来开关光导。
This letter describes the dependence of photocurrent of single-crystalline boron nanobelts on the atmosphere. In ambient air, slow photoresponse under blue light illumination was observed. Rise and decay times exceeded three days. The magnitude of photoresponse in ambient air and oxygen was greater than that in hydrogen and argon atmospheres. In vacuum, a photoresistivity effect consisting of the continuous decrease of conductance under blue light illumination was observed. Variation of band bending of the nanobelt surface by adsorption or desorption of oxygen and water molecules appeared to switch the photoconduction on and off by the respective trapping and recombination of photoexcited carriers at the nanobelt core and surface.This letter describes the dependence of photocurrent of single-crystalline boron nanobelts on the atmosphere. In ambient air, slow photoresponse under blue light illumination was observed. Rise and decay times exceeded three days. The magnitude of photoresponse in ambient air and oxygen was greater than that in hydrogen and argon atmospheres. In vacuum, a photoresistivity effect consisting of the continuous decrease of conductance under blue light illumination was observed. Variation of band bending of the nanobelt surface by adsorption or desorption of oxygen and water molecules appeared to switch the photoconduction on and off by the respective trapping and recombination of photoexcited carriers at the nanobelt core and surface.