Abstract:

The preparation of the compact and full-coverage AgSbS₂ thin films is firstly reported using the pyrolysis of the Ag-butyldithiocarbamate and Sb-butyldithiocarbamate complex solution in DMF. The influence of the preparation temperature on the crystal phase, optical absorption, morphology of the AgSbS₂ thin films is systematically investigated. The AgSbS₂ thin films at 150 °C for 30 min are composed of the individual nanoparticles with the particle sizes of 30-60 nm. When the AgSbS₂ thin films are further heated at 350 °C for 2 min, the individual AgSbS₂ nanoparticles are melted together and the grain boundary between the AgSbS₂ nanoparticles disappear. The solar cells with the architecture of FTO/compact TiO₂/AgSbS₂/spiro-OMeTAD/Au achieve the photoelectric conversion efficiency (PCE) of 2.09%, along with the open-circuit voltage of 0.44 V, the short-circuit photocurrent density of 10.49 mA cm^-2, the fill factor of 0.45. The PCE of 2.09% is the highest value for the AgSbS₂ solar cells.

Key words: AgSbS₂ thin film, Ag-butyldithiocarbamate, Sb-butyldithiocarbamate, Pyrolysis, Solar cell