All-printable stretchable broadband photo-thermoelectric camera sheets

This work successfully develops all-printable photothermoelectric broadband infrared rays (IR) to millimeter-waves (MMW) imagers. The device consists of flexible carbon nanotube (CNT) film channels and exhibits highly efficient absorption characteristics in broad IR–MMW regions. The use of ink-jet printing in the device fabrication allows mechanical alignment of each device component material. Each half region of the originally P-type CNT film channel is chemically doped into N-type, and the PN junction corresponds to the photodetection interface. The use of the enriched CNT solution, which is suitable for the printing process, exhibits sensitive photo-detection, and this work also successfully demonstrates the fundamental IR imaging inspection application with the all-printed imager.