Organic photovoltaic (OPV) devices based on semiconducting polymers and small molecules allow for a low cost alternative to inorganic solar cells. Recent developments show power conversion efficiencies as high as 10-12%, highlighting the potential of this technology. Nevertheless, further improvements are necessary to achieve commercialization. To a large extent the performance of these devices...

•Ion-exchange-induced slow crystallization of 2D-3D perovskite thick films•Ultra-high X-ray sensitivity and low detection limit were achieved•1,024 pixel prototypical image sensors fabricated Reported here is an ion-exchange-induced method two-dimensional (2D) 3D perovskites. This generic approach allows fabrication high-quality films with different compositions tunable film thickness. The thic...

Colloidal quantum dot photovoltaic devices have improved from initial, sub-1% solar power conversion efficiency to current record performance of over 7%. Rapid advances in materials processing and device physics have driven this impressive performance progress. The highestefficiency approaches rely on a fabrication process that starts with nanocrystals in solution, initially capped with long or...