Photonic integrated circuits could offer compact and cost-effective solutions for applications of mid-infrared light such as biomedical sensing. However, photodetectors are a long-standing bottleneck of integrated photonics in this spectral range, mainly constrained by a high dark current and defects induced by lattice mismatch between different materials during growth. This project tackles this challenge by proposing unipolar barrier photodetectors based on heterostructures of two-dimensional layered crystals. Our devices will rely on heterojunctions of judiciously selected layered materials assembled using methods that do not require expensive epitaxial growth and facilitate their integration into waveguides. We aim to cover an ultrabroad wavelength range up to 8 μm. To achieve higher performance at longer wavelengths, we will further fine-tune the band alignment via electrostatic biasing and ferroelectric polarization switching. Our results will address a practical need while providing valuable scientific insights into novel mid-infrared van der Waals materials.