Highly Sensitive Broadband Single‐Walled Carbon Nanotube Photodetectors Enhanced by Separated Graphene Nanosheets,Advanced Optical Materials

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Highly Sensitive Broadband Single‐Walled Carbon Nanotube Photodetectors Enhanced by Separated Graphene Nanosheets
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-09-21 , DOI: 10.1002/adom.201800791
Baofang Cai ₁ , Yanjie Su ₁ , Zejun Tao ₁ , Jing Hu ₁ , Cheng Zou ₁ , Zhi Yang ₁ , Yafei Zhang ₁

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Single‐walled carbon nanotube (SWCNT)/graphene Schottky junctions have great potential for high‐performance all‐carbon photodetector due to their excellent optical and electronic properties and efficient charge transfer. However, the further improvement of device performance is limited by the low absorption of ultrathin SWCNTs and large dark current of continuous graphene nanosheets. Here a proof‐of‐concept photodetector is reported using SWCNT/separated graphene (SGR) hybrid networks. The device is sensitive to a broadband wavelength from visible light to near‐infrared light (405–1064 nm), showing an extremely high photoresponsivity of >3000 A W⁻¹, a fast response speed of 44 µs, and high photoconductive gain of ≈4 × 10⁶. Furthermore, the results demonstrate first the charge transfer dynamics at the planar SWCNT/SGR Schottky junctions by combining Raman spectra with current–voltage curves. The architecture strategy opens a new general route to fabricate ultrahigh‐performance photodetectors based on SWCNT/SGR hybrids or other semiconductor/graphene hybrids.

中文翻译：

分离石墨烯纳米片增强了高灵敏度宽带单壁碳纳米管光电探测器

单壁碳纳米管（SWCNT）/石墨烯肖特基结由于其出色的光学和电子特性以及有效的电荷转移，在高性能全碳光电探测器方面具有巨大的潜力。然而，器件性能的进一步提高受限于超薄SWCNT的低吸收性和连续石墨烯纳米片的大暗电流。此处报告了使用SWCNT /石墨烯（SGR）混合网络进行概念验证的光电探测器。该器件对从可见光到近红外光（405–1064 nm）的宽带波长敏感，显示出> 3000 AW ^-1的极高光响应性，44 µs的快速响应速度和≈4的高光导增益×10 ⁶。此外，结果首先证明了通过结合拉曼光谱与电流-电压曲线在平面SWCNT / SGR肖特基结处的电荷转移动力学。该体系结构策略为制造基于SWCNT / SGR混合体或其他半导体/石墨烯混合体的超高性能光电探测器开辟了一条新的通用路线。

更新日期：2018-09-21

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