Earth‐Abundant Element Photovoltaics Directly from Soluble Precursors with High Yield Using a Non‐Toxic Solvent

A new chemical route to Cu2ZnSn(SxSe1-x)4 based thin film solar cells has been developed using spin coating of commercially available molecular precursors from an environmentally friendly non-toxic solvent. 4.1% efficiency solar cells were achieved after selenization of Cu2ZnSnS4. This technique could provide simple, facile, and reproducible fabrication for efficient and large area solar cells. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.