During “Low-Cost Carbon Nanotubes Photodetetors” ($CNTPD) project, heterojunction photodiodes based on silicon and multi-wall carbon nanotubes will be produced with the ultimate goal (after the end of the program) to be commercially exploited in consumer applications. For this purpose, a general, standard interconnection of the sensor with a mobile communication device (mobile phone or tablet) will be fabricated as a demo application.
The main advantage of our approach is that fabrication as a whole proceeds using standard semiconductor industry methods – even the carbon nanotubes’ layer is fabricated in-situ with chemical vapor deposition (CVD) a technique that has long been used by this industry. In addition, the optical properties of carbon nanotubes allow, at least, the optimism that they can be used to absorb infrared and / or ultraviolet radiation.
Finally, the sensors have already been shown to detect ultraviolet radiation (see e.g. Solid State Electronics 151, 27-35 (2019)). What will be attempted during the program for the particular area of the electromagnetic spectrum is the optimization of the photodetector, i.e. finding the manufacturing parameters that will give us the best response characteristics in the optical and electrical characterization of the photodetector.