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Wallace, Suzanne K.; Svane, Katrine L.; Huhn, William P.; Zhu, Tong; Mitzi, David B.; Blum, Volker; Walsh, Aron
Sustainable energy & fuels, 08/2017, Volume: 1, Issue: 6Journal Article
To build on the success of other mineral systems employed in solar cells, including kesterites (Cu 2 ZnSnS 4 ) and herzenbergite (SnS), as well as mineral-inspired systems such as lead halide perovskites (CH 3 NH 3 PbI 3 ), we have searched for photoactive minerals with the additional constraint that a polar crystal structure is adopted. Macroscopic electric fields provide a driving force to separate electrons and holes in semiconductor devices, while spontaneous lattice polarisation in polar semiconductors can facilitate microscopic photo-carrier separation to enhance carrier stability and lifetimes. We identify enargite (Cu 3 AsS 4 ), stephanite (Ag 5 SbS 4 ), and bournonite (CuPbSbS 3 ) as candidate materials and explore their chemical bonding and physical properties using a first-principles quantum mechanical approach.
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