Polymorphic Tin Sulfide Thin Films of Zinc Blende and Orthorhombic Structures by Chemical Deposition

Polycrystalline thin films ( in thickness) of formed from chemical baths of in acetic acid/ solution, triethanolamine, (aq), and thioacetamide are polymorphic consisting of zinc blende (ZB) and orthorhombic (OR) structures. The ZB structure for the film, reported in this work for the first time, has a lattice constant and a direct (forbidden) bandgap of , which is distinct from that of , about . The electrical conductivity of is p-type, with activation energies for the conductivity of at room temperature and near . When a film is heated in air at for , part of it transforms to and to ; after at in air the film converts to transparent . Such a film has a bandgap of and electrical conductivity, . Photovoltaic effect in different structures involving these films is presented.