Room‐Temperature Phototransistor with Negative Photoresponsivity of 108 A W−1 Using Fullerene‐Sensitized Aligned Carbon Nanotubes
Abstract
Detection of low intensity light down to a few photons requires photodetectors with high gain. A new photodetector is reported based on C60‐sensitized aligned carbon nanotube (CNT) transistors with an extremely high responsivity of 108 A W−1 (gain > 108) in the ultraviolet and visible range, and 720 A W−1 (gain = 940) in the infrared range. In contrast to most sensitized phototransistors that operate on the photogating effect, the new photodetector operates on the modulation of the electrons scattering in the CNTs, leading to negative photoconductivity. Comparison with similar photodetectors using random CNT networks shows the benefit of using aligned CNTs. At room temperature, the aligned CNT photodetectors are demonstrated to detect a few tens of photons per CNT.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 24, 2018
- Source ID
- 10.1002/smll.201802806
Entities
People
- François Léonard
- Kevin Bergemann
Organizations
- Defense Advanced Research Projects Agency
- Sandia National Laboratories