中国物理B ›› 2008, Vol. 17 ›› Issue (8): 3103-3107.doi: 10.1088/1674-1056/17/8/056
王 翀1, 程 轲2, 邹炳锁3, 王菲菲4
Wang Fei-Fei(王菲菲)a)b)†, Wang Chong(王翀)c), Cheng Ke(程轲)b), and Zou Bing-Suo(邹炳锁)b)d)
摘要: Wurtzite CdS nanoribbons are prepared by using a simple thermal evaporation method. Electron microscopy shows that the ribbons are smooth in surface and uniform in size. Besides the intrinsic emission, the photoluminescence spectrum of a CdS nanoribbon shows a peak at about 580\,nm, which may arise from the defect- and the trap- related transitions. The photoresponse of single CdS nanoribbons is researched. When these nanoribbons are exposed to a laser with a wavelength of 400\,nm, their conductivity is enhanced greatly. The conductivity of CdS nanoribbons cannot be restored to a value without any illumination even at 5 minutes after the illumination. A model is proposed to explain this phenomenon, which may be due to a slow photoresponse induced by the trap.
中图分类号: (Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)