1 research outputs found
High-Performance Multilayer Encapsulation for Perovskite Photovoltaics
An encapsulation system comprising of a UVācurable epoxy, a solution processed polymer interlayer, and a glass coverāslip, is used to increase the stability of methylammonium lead triiodide (CH3NH3PbI3) perovskite planar inverted architecture photovoltaic (PV) devices. It is found this encapsulation system acts as an efficient barrier to extrinsic degradation processes (ingress of moisture and oxygen), and that the polymer acts as a barrier that protects the PV device from the epoxy before it is fully cured. This results in devices that maintain 80% of their initial power conversion efficiency after 1000 h of AM1.5 irradiation. Such devices are used as a benchmark and are compared with devices having initially enhanced efficiency as a result of a solvent annealing process. It is found that such solventāannealed devices undergo enhanced burnāin and have a reduced longāterm efficiency, a result demonstrating that initially enhanced device efficiency does not necessarily result in longāterm stability