Pulsed laser deposited heterogeneous mixture of Li2Se–Sb2Se3 nanocomposite as a new storage lithium material

Close-spaced thermally evaporated 3D Sb2Se3 film for high-rate and high-capacity lithium-ion storage

As a key factor for fast-charging lithium-ion batteries (LIBs), high-rate anode materials that can recharge in a few minutes have aroused increasing attention. However, high-rate performance is always accompanied by low theoretical capacities, such as the widely known high-rate electrode of Li4Ti5O12 (175 mA h g-1), which severely limits its large-scale implementation in the development of high power density LIBs. Here, we report a modified close-spaced thermal evaporation process to deposit 3D-structured Sb2Se3 films (3D-SSF) with tunable morphology as an additive-free anode for LIBs. After a high-rate activation process, 3D-SSF exhibits a flatter discharge plateau than the reported results and could deliver a high capacity of 471 mA h g-1 at an ultrahigh current density of 21 440 mA g-1, which is superior to the widely known high-rate Li4Ti5O12 anode (over 150 mA h g-1 at 8750 mA g-1). Moreover, we reveal a current-regulated Li-ion storage mechanism where 3D-SFF undergoes a synergistic conversion and alloying reaction at low current densities, while an alloying reaction-dominated process at high rates. Beyond that, full batteries with excellent rate performance were successfully assembled by pairing with homemade LiFePO4 (LFP) as the cathode.

Effects of working pressure and power on photovoltaic and defect properties of magnetron sputtered Sb2Se3 thin-film solar cells

Antimony selenide (${\text{Sb}_2}{\text{Se}_3}$Sb₂Se₃) is an emerging material with potential applications in photovoltaics, while magnetron sputtering is an important method in material growth. In this study, ${\text{Sb}_2}{\text{Se}_3}$Sb₂Se₃ thin films, prepared by the magnetron sputtering technique with varied working pressures and sputtering powers, were fabricated into solar cells with a structure of $\text{glass}/\text{ITO}/\text{CdS}/{\text{Sb}_2}{\text{Se}_3}/\text{Au}$glass/ITO/CdS/Sb₂Se₃/Au. The current density versus voltage measurements and x-ray diffraction were introduced to compare the photovoltaic and structural properties of the cell samples. Characterization and identification of the defects in ${\text{Sb}_2}{\text{Se}_3}$Sb₂Se₃ thin films were investigated by admittance measurements. The ${\text{Sb}_2}{\text{Se}_3}$Sb₂Se₃ cell samples prepared with appropriate sputtering power (about 60 W) or working pressure (about 0.4 Pa) were found to own better crystal qualities and lower defect densities, which may be the reason for better efficiency.

Antimony selenide/graphene oxide composite for sensitive photoelectrochemical detection of DNA methyltransferase activity

An Sb₂Se₃/graphene oxide composite was applied as both the photoelectrochemical probe and substrate for biomolecule conjugation for the construction of a “signal-off” sandwich-type biosensor for DNA methyltransferase activity detection.