C. Le Bras

Oct 25, 2024 | pubs.aip.org | C. Le Bras |Grzegorz Greczynski |Matteo Meneghini

In a semiconductor or an insulator, as an electron is excited from the valence band to a state in the conduction band, the absence of the valence electron can be regarded as a hole with a positive charge so that an exciton forms from the electron–hole interaction.1 For a confined system with symmetric configuration, there are usually no intrinsic dipoles in excitons.

Oct 25, 2024 | pubs.aip.org | Biomedical Engineering |C. Le Bras |Grzegorz Greczynski |Matteo Meneghini

Hydrogen has been recognized as a carbon-free and clean energy with a wide range of sources and application scenarios, which can help in promoting the clean and efficient utilization of oil and natural gas, and achieving large-scale deep decarbonization of transportation and industrial sectors.1–5 For instance, blending hydrogen into natural gas has been proposed as a promising and cost-effective approach to reduce the emissions from natural gas service.

Oct 23, 2024 | pubs.aip.org | C. Le Bras |Grzegorz Greczynski |Matteo Meneghini

Organic–inorganic hybrid perovskite semiconductors have attracted extensive attention in recent decades owing to their excellent properties such as high absorption coefficient, a tunable bandgap, long carrier diffusion length, and small Urbach energies.1–5 The power conversion efficiency (PCE) of perovskite solar cells (PSCs) increased from the initial 3.8% to 26.1% only in the past ten years.6,7 Although the PCE of PSCs is very close to that of silicon-based cells, abnormal current...

Oct 9, 2024 | pubs.aip.org | C. Le Bras |Grzegorz Greczynski |Matteo Meneghini

Skin is a tissue with natural regenerative abilities. Applying mechanical stretch to the skin can stimulate regeneration, and this process has been studied at both the molecular and cellular levels.1,2 Clinically, skin expansion is a common technique in plastic surgery used to generate additional skin tissue.

Oct 8, 2024 | pubs.aip.org | C. Le Bras |Grzegorz Greczynski |Matteo Meneghini

FIG. 1. Potential energy per particle in the inherent structure, E 0 / N⁠, as a function of the temperature T⁠. We first equilibrate the system in the liquid state at T = 4.0⁠. We then cool the system toward T = 0.05 using a constant cooling rate of d T / d t = 8.33 × 10 − 5 (black open circles). During this cooling process, the glass transition occurs at a temperature of around T G ∗ ≃ 0.37 (denoted by a blue cross).