All-Printed Roll-to-Roll Perovskite Photovoltaics Enabled by Solution-Processed Carbon Electrode.

Perovskite photovoltaics have shown great promise in device efficiency but also the promise of scalability through solution-processed manufacture. Efforts to scale perovskites have been taken through printable mesoporous scaffolds and slot die coating of flexible substrates roll-to-roll (R2R). However, to date there has been no demonstration of entirely R2R-coated devices due to the lack of a compatible solution-processable back electrode; instead, high-value evaporated metal contacts are employed as a post process.

Acetonitrile based single step slot-die compatible perovskite ink for flexible photovoltaics.

The demonstration of photovoltaic devices with high power conversion efficiencies using low cost perovskite materials hints at the possibility of dramatically lowering the cost of solar energy. Key to further exploiting the potential of these materials is developing rapid processing techniques that can be used to deliver lower cost high throughput manufacture. This work details the development of low viscosity rapid drying perovskite formulations designed to give high quality solar films when slot-die coated on flexible roll-to-roll compatible substrates.

Perovskite Photovoltaic Modules: Life Cycle Assessment of Pre-industrial Production Process.

Photovoltaic devices based on perovskite materials have a great potential to become an exceptional source of energy while preserving the environment. However, to enter the global market, they require further development to achieve the necessary performance requirements. The environmental performance of a pre-industrial process of production of a large-area carbon stack perovskite module is analyzed in this work through life cycle assessment (LCA).

Hierarchical structures of cactus spines that aid in the directional movement of dew droplets.

Three species of cactus whose spines act as dew harvesters were chosen for this study: Copiapoa cinerea var. haseltoniana, Mammillaria columbiana subsp. yucatanensis and Parodia mammulosa and compared with Ferocactus wislizenii whose spines do not perform as dew harvesters.

Reproductive outcome after laparoscopic treatment of minimal and mild endometriosis using Helica Thermal Coagulator.

Objective: To investigate the reproductive outcome following Helica Thermal Coagulator (Helica TC) in an infertile population with early-stage endometriosis.

Design: A clinical observational trial conducted in a NHS tertiary referral centre for treatment of endometriosis. Forty-four healthy infertile women (mean age 21 years, range 18-34 years) with laparoscopically confirmed diagnosis of minimal (stage I) or mild (stage II) endometriosis were included.