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Recently bendable and flexible optoelectronics have attracted more attentions on display technology and concaved or curvy photovoltaic devices owing to the flexibility and softy in layered materials. The bending photoluminescence (BPL) and surface photovoltaic effect of a thin multilayer InSe 2D crystal are demonstrated here by using PL and surface photovoltage (SPV) experiments. The BPL result of InSe (t ≈ 30 nm) shows an enhancement in light intensity with respect to that of the other flat PL measurement owing to the spreading of emission solid angle for the irradiant Se-In-In-Se basic units under concaved upward condition. The band edge structure of multilayer InSe is analyzed. The SPV measurement of an In mesh-coated InSe microplate demonstrates that the Schottky-type solar cell converts sunlight starting from ≈1 eV with the auxiliary of surface states on InSe. An initially formed In-InSe Schottky solar cell (surface area of ≈2 mm2 and thickness of ≈85 μm) is also tested. The testing result shows a photovoltage of V ≈ 24 mV can be generated from the Schottky solar cell under the illumination of Hg lamp with power density of P ≈ 0.83 mW cm−2. All the experimental results demonstrate flexible light-emission capability and “1 eV” photoelectric conversion capacity existed in the 2D multilayer e-InSe.

Multilayer InSe with a thickness above ~20 nm is a direct semiconductor proposed for solar-energy conversion and to use in flexible optoelectronics. We demonstrate herein a superior 1000-nm light emission and absorption capability of two-dimensional (2D) multilayer InSe studied by photoluminescence (PL) and photoconductivity (PC) experiments. Layered crystals of InSe have been grown by chemical vapor transport method using ICl3 as a transport agent. Polarized Raman measurement confirmed 2 H e crystalline phase of the as-grown crystals. For 2D flexible applications, the bending photoluminescence (BPL) result of InSe (t ≈ 30 nm) showed an enhancement in light intensity with respect to that of the flat PL condition. It might be because the cylinder surface area under bending (convex) is larger than that of the flat surface under the same laser excitation condition. Besides, the luminescence efficiency of BPL is also enhanced owing to the widening of emission solid angle of each Se-In-In-Se unit in the InSe as compared to that of the flat PL condition. The emission wavelength is about 1000 nm at room temperature. Furthermore, for the PC study, photoresponsivity spectrum of a Ag-InSe-Ag multilayer photoconductor demonstrates a prominent peak absorption at 1.1 ~ 1.3 eV, matching well with the direct-free-exciton energy of the multilayer InSe. All the experimental results demonstrate that 2D multilayer InSe is a promising 1000 nm light emitter and absorber available for potential optoelectronics applications.

Multilayer InSe with a thickness above 20 nm is a direct semiconductor for flexible-optoelectronics use. We show a superior 1000-nm light emission and absorption capability of 2D multilayer InSe studied by photoluminescence and photoconductivity herein.

Purpose: To assess the usefulness of an ultrasound (US)-guided peritoneal biopsy for the solitary peritoneal thickening visualized as only infiltrated fat on a computed tomography (CT) scan. Materials and Methods: This retrospective study included 36 patients (16 males, 20 females; mean age, 51.7 years) who underwent a US-guided biopsy for the solitary peritoneal thickening of unknown cause visualized as only infiltrated fat without an apparent mass formation on a CT scan. The rate of the specific histopathological diagnosis and accuracy for the diagnosis of malignant disease was assessed. Results: The procedure was technically successful with the acquisition of an adequate amount of the specimen for microscopic examination from all patients. A specific histopathological diagnosis was made in 31/36 patients (86.1%): peritoneal carcinomatosis in 15/31 (48.4%), tuberculous peritonitis in 15/31 (48.4%) and panniculitis in 1/31 (3.2%). A non-specific histopathological diagnosis was made in 5/36 (13.9%): chronic inflammation in 4/5 (80%) and mesothelial hyperplasia in 1/5 (20%). The procedure showed sensitivity of 83.3%, with a specificity of 100%, a positive predictive value of 100%, a negative predictive value of 85.7%, and an accuracy rate of 86.1% for the diagnosis of malignant diseases. Conclusion: The US-guided peritoneal biopsy is a fairly accurate diagnostic procedure for the peritoneal thickening visualized as only infiltrated fat on a CT scan, and it can be used before performing laparoscopic or an open biopsy.

We demonstrate a III-VI chalcogenide, polycrystalline γ-In2Se3, which simultaneously possesses the capabilities of thickness-dependent optical gaps and wide-energy-range absorption existed in the polycrystalline layers of γ-In 2 Se 3 . The amorphous effect of medium-range order (MRO) renders a structural-phase transition of γ → α occurred inside the γ-In 2 Se 3 layer with a heat treatment of about 700 °C. Photo V-I measurements of different-thickness γ-In 2 Se 3 layers propose a wide-energy-range photoelectric conversion unit ranging from visible to UV may be achieved by stacking the γ-In 2 Se 3 layers in a staircase form containing dissimilar optical gaps. The results are demonstrated here in.