ao7b01292_si_001.pdf (4.5 MB)
Solvent-Coordinated Tin Halide Complexes as Purified Precursors for Tin-Based Perovskites
journal contribution
posted on 2017-10-20, 14:55 authored by Masashi Ozaki, Yukie Katsuki, Jiewei Liu, Taketo Handa, Ryosuke Nishikubo, Shinya Yakumaru, Yoshifumi Hashikawa, Yasujiro Murata, Takashi Saito, Yuichi Shimakawa, Yoshihiko Kanemitsu, Akinori Saeki, Atsushi WakamiyaA series of solvent-coordinated tin
halide complexes were prepared
as impurity-free precursors for tin halide perovskites, and their
structures were determined by single-crystal X-ray diffraction analysis.
Using these precursors, the tin halide perovskites, MASnI3 and FASnI3, were prepared, and their electronic structures
and photophysical properties were examined under inert conditions
by means of photoelectron yield spectroscopy as well as absorption
and fluorescence spectroscopies. Their valence bands (MASnI3: −5.02 eV; FASnI3: −5.16 eV) are significantly
higher than those of MAPbI3 or the typical hole-transporting
materials 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamino)-9,9′-spirobifluorene
and poly(bis(4-phenyl)(2,4,6-trimethylphenyl)amine). These results
suggest that to develop the solar cells using these tin halide perovskites
with efficient hole-collection properties, hole-transporting materials
should be chosen that have the highest occupied molecular orbital
levels higher than −5.0 eV.