In substrate preparation methods for perovskite solar cell, the literature reports etching of 1/3 rd of surface with acid treatment. why do we need to do it?
Hi, it's because you don't want to have it under your rear contact pad during measurement (increased Jo and so decreased Voc... and increased possibility of shunting during measurement). So you contact one side of the cell on the FTO and the other on the rear metal contact.