An innovative approach for fabrication of Cu2ZnSnSe4 absorber layers using solutions of elemental metal powders
journal contributionposted on 02.02.2017 by Carl Cooper, Panagiota Arnou, Lewis Wright, Sona Ulicna, Michael Walls, Andrei Malkov, Jake Bowers
Any type of content formally published in an academic journal, usually following a peer-review process.
An innovative approach has been demonstrated for the deposition of Cu2ZnSnSe4 (CZTSe) absorber layers. Using a unique, safe solvent combination, moving away from hydrazine, elemental Cu, Zn, Sn and S/Se can be fully dissolved at ambient conditions, with the composition easily controlled. The preparation and the spray deposition of these solutions are performed in air, allowing a quick, easy and inexpensive process. Upon selenisation, large crystals are observed which are identified as the CZTSe kesterite phase using X-ray diffraction and Raman, the latter showing no distinctive signs of any binary or ternary secondary phases. Using this method, CZTSe absorber layers have been prepared for use in thin-film solar cells reaching efficiency of 3.2%. With further device optimisation, improved device performance will be achieved.
The authors would like to acknowledge Loughborough Materials Characterisation Centre (LMCC) for the use of their facilities for FEGSEM images, as well as the EPSRC PVTEAM project (EP/L017792/1) for funding this work.