X-ray photoresponse of κ-Ga 2 O 3 is investigated for the first time. Results show that a versatile material development high-performance direct detectors.

Rapid photon response is demonstrated for devices made using individual single-crystalline selenium nanobelts. The temperature dependence of the photocurrent has been studied between — 70 to 100 C. The best performance is at temperatures below 40 C. The response time to fluorescent light is as quick as 30 ms once tunes on, and the recovery time is as short as 50 ms when the light is off. This s...

Abstract Two-dimensional transition metal carbides, nitrides, and carbonitrides, collectively known as MXenes, are finding numerous applications in many different areas, including optoelectronics photonics, but there is limited information about their intrinsic photoresponse. In this study, we investigated the visible near-infrared range photoresponse of Ti 3 C 2 T x , most popular MXene materi...

An effect, in planar GaAs MESFETs, whereby a sharp increaSe in optical gain at the transistor edges occurs, is reported. This gain effect only manifests when a large resistor is inserted in ser-ies with the gate, to produce the conditions for photovoltaic gate biasing. The mechanism for increased gãin, at t'he edges, is suggested to be due to carrier photogeneration in the substrate that is sub...

We report mid-infrared photocurrent spectra of graphene nanoribbon arrays on SiO2 dielectrics showing dual signatures of the substrate interaction. First, hybrid polaritonic modes of graphene plasmons and dielectric surface polar phonons produce a thermal photocurrent in graphene with spectral features that are tunable by gate voltage, nanoribbon width, and light polarization. Second, phonon po...

Graphene has become one of the most promising materials for future optoelectronics due to its ultrahigh charge-carrier mobility, high light transmission, and universal absorbance in the near-infrared and visible spectral ranges. However, a zero band gap and ultrafast recombination of the photoexcited electron-hole pairs limit graphene's potential in photovoltaic generation. Recent studies have ...