Scientists at Xi’an Jiaotong University have fabricated an inverted perovskite solar cell that utilizes a self-assembled bilayer (SAB) as a hole-selective molecular contact. Inverted perovskite ...

An international team led by the U.S. National Renewable Energy Laboratory (NREL) has used ionic salt for the electron transport layer of a perovskite solar cell to improve device stability and ...

History, intrigue and a misprint combine so that a single stamp has sold for $2 million at auction. What is it? Well, at the basic level, it is a U.S. postage stamp from 1918. But this stamp's got ...

The Inverted Jenny, issued by the U.S. Post Office in 1918, depicts a biplane called the Curtiss JN, known as a Jenny. But in part because of a rush to print the stamps, the plane was accidentally ...