| 초록 |
Cu(In,Ga)(S,Se)2 and CdTe are widely used in photovoltaic materials for the thin film solar cells. However, the materials contain scarce and toxic elements. Many researchers have been focused the development of earth-abundant, non-toxic thin film solar cells. In this aspect, tin monosulfide (SnS) is a promising candidate as an absorber material for solar cell. Its constituent elements (tin and sulfur) are inexpensive, environmental friendly, and abundant in nature. Moreover, the binary compound SnS provides much simpler chemistry than multicomponent Cu2ZnSn(Se,S)4, one of the most promising earth-abundant absorber materials, with solar conversion efficiency up to 9.6%. Despite these promising properties, solar cells based on SnS absorbers have not achieve conversion efficiency higher than 1.3%, while theoretically such cells should be able to reach 24% efficiency. This poor performance may be due to defects or impurities in SnS layers that result from the preparation methods used to make the films. In this study, SnS thin films have been deposited on glass substrates by RF magnetron sputtering. Different annealing temperatures in vacuum for the samples, in the range of 100-400 oC, were tested to study their effects on the structural and optical properties of the films. |
