World's first conductive tin sulfide n-type SnS thin film solar cells without toxic elements

http://www.tohoku.ac.jp/en/press/ntype_conductive_tin_sulfide_thin_films.html

"Utilizing chlorine-doping and a sulfur plasma supply, the research group reduced the lattice defects inhibiting the n-type conversion of SnS... Our realization paves the way for practical pn homojunction SnS thin-film solar cells"