Scalable Terahertz Room Temperature Photoreceivers Based on Large‐Area Hexagonal Boron Nitride and Graphene Heterostructures

Abstract The development of scalable techniques for large‐area growth of layered materials unlocks technological opportunities for the implementation of devices and components suitable for on‐chip integration on photonic integrated platforms. Here, terahertz (THz) photoreceivers based on large‐area hexagonal boron nitride/single‐layer graphene (SLG)/hexagonal boron nitride heterostructures, prepared by chemical vapor deposition and realized by means of an industrially scalable method, are reported. The photo‐thermoelectric sensors are integrated on‐chip with planar antennas, on‐chip radio frequency circuitry, a low‐pass hammer‐head filter and coplanar strip lines, combining nanosecond response time and large sensitivity. Room temperature responsivities of ≈4 V W ⁻¹ , with noise equivalent power ≈4 nWHz ^−1/2 at high (2.86 THz) frequencies are reached, in a fully frequency‐scalable architecture. This paves the way for multiplexed hyperspectral THz cameras and optical communication systems.