Improvement of ultra-broadband photodetection with a device based on twisted double bilayer graphene

https://phys.org/news/2023-09-ultra-broadband-photodetection-device-based-bilayer.html

"2 bilayer graphene stacks twisted 15° create electric field without extra electrodes enabling scalable broadband detection detecting light from 3 to 150 THz... internal quantum efficiency >40%, enhanced photoconductivity by interlayer screening, and scalability of TDBG because no gates needed to apply electric field in order to get bandgap... long-wavelength capabilities down to 2 THz... autonomous driving, environmental monitoring, health care, space exploration, agriculture and food processing"