Semiconductor heterojunctions are ubiquitous components of modern electronics with properties that depend crucially on the band alignment. Here we demonstrate an electrically tunable transition between straddling gap (type-I) and staggered gap (type-II) band alignments in MoSe2/WS2 heterobilayers by investigating their luminescence and photocurrent characteristics.

Direct imaging to track photocurrent streamlines in quantum optoelectronic devices remains a key challenge in understanding exotic device behavior. Here, we combine laser imaging with light-sensitive devices to show images of photocurrent streamlines through a working device.

The predominance of green terrestrial plants stems from chlorophyll's absorbance wavelengths. Those spectral selections ensure consistent energy harvesting and avoid photo-oxidative stress.

An interlayer-exciton vibronic structure is observed in WSe₂/MoSe₂ heterojunction photodiodes.

Electron crystallization is shown to modulate the valley dynamics of excitonic states in a WSe₂/WS₂ moiré Superlattice.

Moiré trions exhibit sharp lines and a complex charge-density dependence, features that differ markedly from those of conventional trions.

Optimally spaced pairs of off-center absorption peaks can maximize photosynthetic output in the face of external noise.

Optical recombination of excitons and trions in monolayer WSe₂ is observed and trions are shown to decay via both intervalley and intravalley pathways with distinct final states.

Our groundbreaking technique combines ultrafast lasers, scanning optics, hardware automation and advanced data analysis to understand the behavior of 2D heterostructures.

At high densities electrons and holes can condense into an electron hole liquid droplet, an exotic phase of matter that, in 2D MoTe₂, can be created at room temperature.

Ultra-clean, low-defect graphene devices are shown to exhibit an intrinsic photocurrent which occurs exclusively at the charge-neutrality point.

This Perspective describes recent advances in using twisted atomic layers to engineer nanoscale electronic devices and offers insight into future prospects for innovation.

Atomic layer heterostructures are shown to greatly increase the efficiency of amplifying small signals and light-to-electricity conversions.

A revolutionary design principle for solar energy harvesting quantum photocells may also reveal the predominance of green plants on Earth.

Excitation-emission spectroscopy is carried out on Nd:AlN ceramics to determine their suitability as next-generation laser materials.

Bias voltage and optical excitation are used to tune thermalization pathways in an atomically thin graphene-boron nitride-graphene heterostructure.

A Nature News and Views article discussing recent experimental work on the direct propulsion and levitation of graphene.

A review article describing recent experimental and theoretical work that focuses on graphene and carbon nanotubes for solar energy harvesting applications.

Direct time-of-flight measurements yield the time required for electrons and holes to escape a photodiode composed of an individual carbon nanotube.

Photo-excited charge carriers in graphene are found to enhance thermal energy transport leading to an efficient photo-thermoelectric effect.

A cylindrical lattice of repulsive particles can reproduce phyllotaxis experimental and numerical evidence shows that the phyllotactic lattice is actually an energetic ground state.

High-energy electrons and holes in carbon nanotube photodiodes are found to efficiently generate multiple electron-hole pairs.

Phyllotactic spirals, commonly observed in the spines of a cactus, are found to be the energetic minimum of a dynamic system of repelling dipoles on a cylinder.