Tao Chen News Today : Breaking News, Live Updates & Top Stories | Vimarsana

Scientists in China built for the first time a four-terminal tandem perovskite cell with a 17.88%-efficient top perovskite device and a 7.85%-efficient bottom antimony selenide bottom cell. The key features of the tandem cell are the transparent conducting electrode used to improve the spectral response of the top cell and the "double" electron transport layer of the antimony selenide cell.

An international group of researchers from the University of Science and Technology of China developed a proof-of-concept tandem solar cell tandem solar cell for the first time, by using antimony selenide for the bottom cell and a wide-bandgap organic-inorganic hybrid perovskite material for the top cell.

A 9 year old girl presented with a solitary hairless area on the left side of her scalp that was first noticed when she was aged 3 years but had not progressed over time. The girl was in good health and had no history of trauma, pruritus, or discomfort in the area. On physical examination an oval non-cicatricial (non-scarring) alopecic patch was observed in the left frontotemporal region (fig 1). Dermoscopy showed hairs of variable diameter and length, white hairs, vellus hairs, and empty follicles (fig 2). No fungi were detected on direct microscopic examination. Fig 1 Oval non-scarring alop...

A man in his 20s presented to the dermatology clinic with a one week history of fever, myalgia, and malaise and a five day history of painful lesions on the penis and pubis. The lesions had gradually increased in number and size over 2-3 days, and each developed a central umbilicated necrotic black crust with peripheral oedematous erythema (fig 1). The left inguinal lymph nodes were enlarged and tender. No other lesions were evident on the body or in the mucosal areas. The patient reported several same sex sexual encounters during the previous two months. Serological tests for syphilis and HIV...

A seven week old female infant presented with an asymptomatic pink-red rash on the left cheek, which had been present at birth. The parents reported that the rash had not changed since the infant’s birth. The infant was born at term by a spontaneous, uncomplicated delivery and had normal growth and development. Physical examination showed a pink patch with a perilesional blanching halo, fine or coarse telangiectasia, peripheral small red papules, and no palpable mass (fig 1). Dermoscopy showed multiple red branching, serpiginous or tortuous vessels, and vascular lacunae on a pink background ...