Electrical modulation of excitonic transition in monolayer tungsten disulfide on periodically poled ferroelectric substrates

Polymer-Waveguide-Integrated 2D Semiconductor Heterostructures for Optical Communications

“…Meanwhile, TMDs have a diverse bandgap that covers a broad range of spectra, which allows versatile optoelectronic devices ranging from infrared to visible wavelengths. , In particular, monolayer (1L)-TMDs such as MoS 2 possess a direct bandgap that enables radiative light emission using excitonic recombination. This phenomenon can be observed at room temperature owing to the high exciton binding energy, which is advantageous for practical applications. , The light emission from TMDs, which can be modulated by an external electric field, can act as an optical signal in a photonic circuit, which can be used in applications. − The hybridization of such optical components with conventional electronics is a synergistic way to realize integrated circuits. Optical signals can be detected and converted to electronic signals by separating the electron–hole pair and extracting them using miniaturized electrodes. , Moreover, 2D materials have been investigated not only for integrating Si-based platforms but also for realizing flexible soft electronics. , Thus, to use the excitonic signal in an optoelectronic circuit, we need to find an appropriate on-chip optical interconnect that can carry optical information on rigid Si substrates as well as on transferable and flexible substrates.…”