Abstract Multiwalled carbon nanotubes (MWCNTs) and their nitrogen-doped counterparts (N-MWCNTs) were synthesized by the pyrolysis technique. For infrared detection, Ag-MWCNTs-Ag structured devices have been fabricated and their infrared photoresponses are assessed. The devices show stable photoresponses over multiple cycles. The observed responsivity values of the devices are in the range of 0.2–0.4 AW−1 (at a low bias voltage of 0.5 V) and are superior to many other infrared detectors using similar materials. In both the devices, the photocurrents originate predominantly due to photoconductive effect of the semiconducting MWCNTs. External quantum efficiency (EQE) of the N-doped MWCNTs based device is much higher than that of the undoped one. The better performance of the N-doped MWCNTs based device is due to higher infrared absorption and trap assisted gain influenced by the band structure modification of the nanotubes by doped heteroatoms.

中文翻译：

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基于多壁碳纳米管的红外光电探测器：深入了解氮掺杂的影响

摘要 通过热解技术合成了多壁碳纳米管（MWCNTs）及其掺氮对应物（N-MWCNTs）。对于红外检测，已经制造了 Ag-MWCNTs-Ag 结构的器件并评估了它们的红外光响应。这些器件在多个周期内表现出稳定的光响应。观察到的器件响应度值在 0.2–0.4 AW-1 范围内（在 0.5 V 的低偏置电压下），并且优于许多其他使用类似材料的红外探测器。在这两种器件中，光电流主要源于半导体 MWCNT 的光电导效应。基于 N 掺杂 MWCNTs 的器件的外部量子效率 (EQE) 远高于未掺杂的器件。