Jin Yizheng, Wang Jianpu, Sun Baoquan, Blakesley James C, Greenham Neil C
Cavendish Laboratory, Cambridge, UK.
Nano Lett. 2008 Jun;8(6):1649-53. doi: 10.1021/nl0803702. Epub 2008 May 7.
A "visible-blind" solution-processed UV photodetector is realized on the basis of colloidal ZnO nanoparticles. The devices exhibit low dark currents with a resistance >1 TOmega and high UV photocurrent efficiencies with a responsivity of 61 A/W at an average intensity of 1.06 mW/cm(2) illumination at 370 nm. The characteristic times for the rise and fall of the photocurrent are <0.1 s and about 1 s, respectively. The photocurrent of the device is associated with a light-induced desorption of oxygen from the nanoparticle surfaces, thus removing electron traps and increasing the free carrier density which in turn reduces the Schottky barrier between contacts and ZnO nanoparticles for electron injection. The devices are promising for use in large-area UV photodetector applications.
基于胶体氧化锌纳米颗粒实现了一种“可视-盲视”溶液处理的紫外光探测器。该器件具有低暗电流（电阻>1太欧）和高紫外光电流效率，在370nm处平均强度为1.06mW/cm²的光照下响应度为61A/W。光电流上升和下降的特征时间分别<0.1秒和约1秒。该器件的光电流与纳米颗粒表面光诱导的氧脱附有关，从而去除电子陷阱并增加自由载流子密度，这反过来又降低了接触与氧化锌纳米颗粒之间用于电子注入的肖特基势垒。这些器件有望用于大面积紫外光探测器应用。
