Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8160286 | Physica B: Condensed Matter | 2018 | 19 Pages |
Abstract
Cu2ZnSnSe4 (CZTSe) nanocrystals were prepared by a solvo-thermal method using elemental copper, zinc, tin and selenium powders as precursors and ethylenediamine as a stabilizer and chelating medium. The particles were synthesized at 180â¯Â°C after which they were annealed at 300â¯Â°C and 400â¯Â°C for 1â¯h. The influence of annealing the nanocrystals, on the crystal structure, particle size, morphology, composition and optical properties has been investigated. As-grown particles were found to contain secondary phases, which subsequently transformed into CZTSe nanocrystals upon annealing. XRD and Raman results confirmed that the samples recrystallized into kesterite CZTSe on annealing at 400â¯Â°C. SEM studies show that the as-grown material has a platelet like morphology, and after annealing at 400â¯Â°C, freshly formed nanosized particles (10-20â¯nm) appear. TEM studies reveal that the grain size of CZTSe nanoparticles is about 5-10â¯nm. Optical studies show that the band gap energy exhibits a blue shift in the range 1.3-1.6â¯eV, indicative of quantum confinement of electrons.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Tarun Chandel, M Burhanuz Zaman, Nilanjan Basu, Jayeeta Lahiri, Rajaram Poolla,