Volume 5 Issue 8, August 2022

Silicon-based dual-gate photodiodes with electrostatically controlled photocurrents can be used to create imaging systems that can compute incoming visual data.

Laser-assisted chemical reactions have been used to write reversible ultra-high-density doping patterns in graphene for optoelectronic applications. The approach used two laser beams with specific photon energies and geometric configurations to enable local doping with a high dopant coverage ratio on graphene, while preserving the electronic properties of the surface.

Microelectromechanical systems that can disintegrate and degrade after a targeted lifetime are demonstrated alongside bioresorbable encapsulating materials and deployment strategies that offer safe biointegration of such devices. These devices have the potential to reduce electronic waste and help create temporary biomedical implants.

Lattice distortions induced by ripples in two-dimensional molybdenum disulfide can reduce electron–phonon scattering, leading to improved charge carrier mobility and enhanced transistor performance.

Vanadium diselenide van der Waals contacts made with a controlled crack formation process can be used to fabricate tungsten diselenide transistors with channel lengths of less than 100 nm, on-state current densities of up to 1.7 mA μm^–1 and on-state resistances down to 0.50 kΩ μm.

Two laser beams with different energies and configurations can be used to reversibly dope graphene via chlorination and chlorine removal, allowing rewritable graphene photodetectors to be fabricated.

Solution-processed lead–tin binary perovskite photodetectors that have an external quantum efficiency of 85% at 850 nm, dark current below 10^–8 A cm^–2 and response time faster than 100 ps can be used in light detection and ranging applications, resolving sub-millimetre distances with a typical 50 µm standard deviation.

A network of dual-gate silicon p–i–n photodiodes, which are compatible with complementary metal–oxide–semiconductor fabrication processes, can perform in-sensor image processing by being electrically programmed into convolutional filters.

Transient micro-electromechanical system (MEMS) devices that are based on water-soluble material platforms can provide safe implants for biointegrated systems.