Superoxide radical derived metal-free spiro-OMeTAD for highly stable perovskite solar cells The migration and hygroscopicity of lithium salt in doped spiro-OMeTAD hampers the device efficiency of perovskite solar https://arunnekb216676.blog2freedom.com/29912463/photovoltaik-förderung-wien-keine-weiteren-ein-geheimnis