Impact Factor:11.9
DOI number:10.1039/c8ta08315k
Journal:Journal of Materials Chemistry A
Abstract:Sb-based perovskite structures have been studied as the potential materials to replace lead hybrid perovskite. However, their broad band gap makes them unsuitable for single-junction solar cells, which spurred researchers to design new strategies to narrow the band gap and broaden their photovoltaic application. Herein, a general doping strategy was designed to obtain lead-free and large size Sn-doped MA3Sb2I9 single crystals. Their crystal structures and valence states were investigated in detail by X-ray diffraction and the X-ray photoelectron spectroscopy, revealing distinct lattice expansion, thus demonstrating the successful doping of Sn2+. After the doping of Sn2+, a significant 296 nm red-shifted light absorption peak was clearly observed, and the carrier mobility enhanced by about two-fold, as investigated by space charge-limited current (SCLC) and Hall effect measurements. The trend of the band gap determined by the first-principles calculations matches well with that of experiments. The corresponding narrowing mechanism of band gap after the doping is also revealed in detail. These extremely promising photoelectric properties of Sn-doped MA3Sb2I9 shown herein motivate further exploration of their photovoltaic application.
Indexed by:Journal paper
Discipline:Engineering
Document Type:J
Issue:2018.42
Translation or Not:no
Date of Publication:2018-10-02
Included Journals:SCI
Links to published journals:https://pubs.rsc.org/en/content/articlelanding/2018/ta/c8ta08315k