School of Engineering and Applied Sciences, Harvard University , 33 Oxford Street, Cambridge, Massachusetts 02138, United States.
Nano Lett. 2014;14(4):1804-9. doi: 10.1021/nl404379w. Epub 2014 Mar 6.
The organic dye filters of conventional color image sensors achieve the red/green/blue response needed for color imaging, but have disadvantages related to durability, low absorption coefficient, and fabrication complexity. Here, we report a new paradigm for color imaging based on all-silicon nanowire devices and no filters. We fabricate pixels consisting of vertical silicon nanowires with integrated photodetectors, demonstrate that their spectral sensitivities are governed by nanowire radius, and perform color imaging. Our approach is conceptually different from filter-based methods, as absorbed light is converted to photocurrent, ultimately presenting the opportunity for very high photon efficiency.
传统彩色图像传感器的有机染料滤光片可实现彩色成像所需的红/绿/蓝响应，但存在与耐久性、低吸收系数和制造复杂性相关的缺点。在这里，我们基于全硅纳米线器件和无滤光片报告了一种新的彩色成像范例。我们制造了由具有集成光电探测器的垂直硅纳米线组成的像素，证明了它们的光谱灵敏度受纳米线半径的控制，并进行了彩色成像。我们的方法与基于滤光片的方法在概念上不同，因为吸收的光被转换为光电流，最终为非常高的光子效率提供了机会。
