ZnSe Etching of Zn-Rich Cu2ZnSnSe4: An Oxidation Route for Improved Solar-Cell Efficiency (pages 14814–14822)
Simón López-Marino, Yudania Sánchez, Dr. Marcel Placidi, Andrew Fairbrother, Moisés Espindola-Rodríguez, Xavier Fontané, Dr. Víctor Izquierdo-Roca, Dr. Juan López-García, Dr. Lorenzo Calvo-Barrio, Prof. Dr. Alejandro Pérez-Rodríguez and Dr. Edgardo Saucedo
Article first published online: 10 OCT 2013 | DOI: 10.1002/chem.201302589
Se-rich kesterites are highly promising materials for low-cost thin-film photovoltaics and are usually grown under Zn-rich and Cu-poor conditions. Although these conditions lead to the presence of a ZnSe secondary phase, which is detrimental for device performance, the phase can be selectively and oxidatively removed by treating the material with KMnO4 in H2SO4 followed by aqueous Na2S (see graphic).