Single Crossed Heterojunction Assembled with Quantum-Dot-Embedded Polyaniline Nanowires

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• 作者：Xianguang Yang ; Dinghua Bao ; Yao Zhang ; Baojun Li
• 刊名：ACS Photonics
• 出版年：2016
• 出版时间：July 20, 2016
• 年：2016
• 卷：3
• 期：7
• 页码：1256-1264
• 全文大小：781K
• 年卷期：0
• ISSN：2330-4022

文摘

Nanoscale photodetectors are highly attractive for their potential applications in integrated optoelectronic devices. One-dimensional flexible nanowire-based photodetectors are especially important because low-dimensional nanostructures are fascinating platforms for manipulating electrons and photons at the subwavelength scale. Herein, we report an ultraviolet–visible photodetector based on a single crossed heterojunction assembled with quantum-dot-embedded polyaniline nanowires. The quantum-dot-embedded polyaniline nanowires are fabricated by a direct drawing method. Based on these inorganic–organic hybrid nanowires, room-temperature, high-performance, high-speed photodetectors are constructed. The fabricated photodetectors show an excellent light response in the wavelength region of 365 to 550 nm, with an external quantum efficiency of 10⁵ %, a responsivity of 10³ A/W, an on–off switching ratio of 10, and a short response/recovery time of 9 ms. These excellent performance characteristics are attributed to the abundant inorganic–organic interfaces and the intermediate radiative reabsorption process. The spectral response range can be readily tuned to a desired waveband by changing the emission wavelength of the quantum dots. This cross-heterojunction-based photodetector may have potential applications in integrated photonic and optoelectronic devices.