Fullerene-sensitized carbon nanotube array phototransistor with responsivity of 10^8 A/W (Conference Presentation)

Kevin Bergemann; Francois Leonard

doi:10.1117/12.2518052

14 May 2019 Fullerene-sensitized carbon nanotube array phototransistor with responsivity of 10⁸ A/W (Conference Presentation)

Kevin Bergemann, Francois Leonard

Author Affiliations +

Proceedings Volume 10978, Advanced Photon Counting Techniques XIII; 109780L (2019) https://doi.org/10.1117/12.2518052
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

Detection of few-photon signals requires photodetectors with high gain, typically achieved with bulk devices such as avalanche photodiodes, superconducting systems, and photomultiplier tubes. Recently, there has been interest in exploiting the properties of nanoscale materials and devices to realize new types of high gain photodetectors. In this presentation, a new photodetector is reported based on C60-sensitized aligned carbon nanotube (CNT) transistors with extremely high responsivity of 108 A W-1 (gain > 108) in the UV and visible, and 720 A W-1 (gain = 940) in the IR. In contrast to most sensitized phototransistors that operate on the photogating effect, the new photodetector operates on modulation of the electron scattering in the CNTs, leading to negative photoconductivity. Comparison with similar photodetectors using random CNT networks show the benefit of using aligned CNTs. At room temperature the aligned CNT photodetectors are demonstrated to detect a few tens of photons per CNT, and recent results with single CNT devices show detection of 200 photon pulses. Quantum transport modeling reveals the photodetection mechanism and establishes a path towards single photon detection.

Conference Presentation

Citation Download Citation

Kevin Bergemann and Francois Leonard "Fullerene-sensitized carbon nanotube array phototransistor with responsivity of 10⁸ A/W (Conference Presentation)", Proc. SPIE 10978, Advanced Photon Counting Techniques XIII, 109780L (14 May 2019); https://doi.org/10.1117/12.2518052

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