Cubical Kasterite Cu 2 ZnSnSe 4 (CZTSe) Thin Films for Solar Cell Application
Sandesh B. Jirage, Kishor V. Gaikwad, Darpan V. Bhuse, Trushant R. Lohar, Nilesh Junghare, Gopinath KhansoleABSTRACT
The Cu 2 ZnSnSe 4 (CZTSe) considered as promising and reliable as a low‐cost absorber semiconductor material for current and future photovoltaic technology due to its direct matchable band gap as well as a high absorption coefficient greater than 10 4 cm −1 . The composition of CZTSe is of naturally abundant and nonpoisonous nature furnishes high chance for production of greener solar absorber material. So far we have synthesized high quality Cu 2 ZnSnSe 4 thin films by a simple and economical chemical bath deposition technique. The films were characterized by X‐ray diffraction, Raman, Scanning electron microscopy, EDS, optical absorbance, photoluminance, electrical conductivity, and PEC techniques. The characterization study revealed a highly applicable poly‐crystalline and most stable kasterite phase in a fair stoichiometric form with a uniform ice cube‐like cubical morphology for CZTSe thin films. The optical absorbance study estimates band gap at 1.0 eV strongly supported by photoluminescence spectra peak at 1196 nm. The conductivity measurement shows semiconducting nature of the film and single type of conduction mechanism. A PEC cell study of CZTSe thin films shows 2.09% stable photo conversion efficiency.