Correction to van der Waals Heterostructures with High Accuracy Rotational Alignment

High Photovoltaic Quantum Efficiency in Ultrathin van der Waals Heterostructures.

We report experimental measurements for ultrathin (<15 nm) van der Waals heterostructures exhibiting external quantum efficiencies exceeding 50% and show that these structures can achieve experimental absorbance >90%. By coupling electromagnetic simulations and experimental measurements, we show that pn WSe2/MoS2 heterojunctions with vertical carrier collection can have internal photocarrier co...

Two-Dimensional Semiconductor Optoelectronics Based on van der Waals Heterostructures

Two-dimensional (2D) semiconductors such as transition metal dichalcogenides (TMDCs) and black phosphorous have drawn tremendous attention as an emerging optical material due to their unique and remarkable optical properties. In addition, the ability to create the atomically-controlled van der Waals (vdW) heterostructures enables realizing novel optoelectronic devices that are distinct from con...

Heterostructures based on inorganic and organic van der Waals systems

Thermionic Energy Conversion Based on Graphene van der Waals Heterostructures

Seeking for thermoelectric (TE) materials with high figure of merit (or ZT), which can directly converts low-grade wasted heat (400 to 500 K) into electricity, has been a big challenge. Inspired by the concept of multilayer thermionic devices, we propose and design a solid-state thermionic devices (as a power generator or a refrigerator) in using van der Waals (vdW) heterostructure sandwiched b...

Nano Electronics on Atomically Controlled van der Waals Quantum Heterostructures

In this project, we designed and engineered hetero-interfaces of 2-dimensional (2D) van der Waals (vdW) materials for the realization of novel quantum electronic states. We employed molecular beam epitaxy (MBE) combined with nanofabrication techniques to form functional nanostructures that can be utilized for new electronic device applications. We have demonstrated growth of topological insulat...