N-type conductive tin sulfide films for environmentally friendly solar cells has effect on the molybdenum disilicide heating elements price market

N-type conductive tin sulfide films for environmentally friendly solar cells has effect on the molybdenum disilicide heating elements price market

Tin sulfide (SnS) is a kind of abundant, safe and environmentally friendly solar cell material. The cheap material is expected to be used in the next generation of solar panels.

A research team led by Issei Suzuki and Sakiko Kawanishi, assistant professors at the Institute of Advanced Materials Multidisciplinary Research, Tohoku University, Japan, prepared n-type conductive SnS films using impurity doping for the first time.

Traditional SnS films are usually p-type conductive. Therefore, SnS thin-film solar cells were fabricated by using PN heterojunction with P-type SnS thin film and other N-type semiconductor thin films (such as CD). However, the conversion efficiency of such heterojunction devices has been stuck at around 5%, making their use impractical. SnS thin-film solar cells with PN homojunction are expected to show higher conversion efficiency when SnS thin film is applied to P and N-type layers. However, n-type beneficial SnS films without toxic elements have never been realized. The research team achieved the world\'s first N-type SnS film without toxic elements by reducing lattice defects that inhibit the transformation of SnS using chlorine doping and sulfur plasma supply.

Schematic diagram of the new technology used to manufacture N-type SnS film. N-type conductive SnS films doped with chloride ions were prepared by supplying sulfur plasma. Source: Issei Suzuki et al. "Our findings pave the way for practical PN homogeneous SnS thin-film solar cells," Suzuki said.

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