State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
J Am Chem Soc. 2011 Feb 23;133(7):2037-9. doi: 10.1021/ja110092a. Epub 2011 Jan 27.
Bandgap engineering of semiconductor nanowires is important in designing nanoscale multifunctional optoelectronic devices. Here, we report a facile thermal evaporation method, and realize the spatial bandgap engineering in single CdS(1-x)Se(x) alloy nanowires. Along the length of these achieved nanowires, the composition can be continuously tuned from x = 0 (CdS) at one end to x = 1 (CdSe) at the other end, resulting in the corresponding bandgap (light emission wavelength) being modulated gradually from 2.44 eV (507 nm, green light) to 1.74 eV (710 nm, red light). In spite of the existing composition (crystal lattice) transition along the length, these multicolor nanowires still possess high-quality crystallization. These bandgap engineered nanowires will have promising applications in such as multicolor display and lighting, high-efficiency solar cells, ultrabroadly spectral detectors, and biotechnology.
半导体纳米线的能带工程在设计纳米级多功能光电设备中非常重要。在这里，我们报告了一种简单的热蒸发方法，并在单个 CdS(1-x)Se(x) 合金纳米线中实现了空间能带工程。在这些实现的纳米线的长度上，组成可以从一端的 x = 0（CdS）连续调谐到另一端的 x = 1（CdSe），从而使相应的能带（发光波长）从 2.44eV（507nm，绿光）逐渐调制到 1.74eV（710nm，红光）。尽管在长度上存在组成（晶格）转变，但这些多色纳米线仍具有高质量的结晶。这些能带工程纳米线将在多色显示和照明、高效太阳能电池、超宽带光谱探测器和生物技术等领域具有广阔的应用前景。
