Journal
NPG ASIA MATERIALS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/am.2017.45
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Funding
- European Union through FP7 (ERC NANOSOLID, GA) [306733]
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Formamidinium (FA)-based hybrid lead halide perovskites (FAPbX(3), X = I or Br/I) have recently led to significant improvements in the performance of perovskite photovoltaics. The remaining major pitfall is the instability of alpha-FAPbI(3), causing the phase transition from the desired three-dimensional cubic perovskite phase to a non-perovskite one-dimensional hexagonal lattice. In this work, we report the facile, inexpensive, solution-phase growth of cm-scale single crystals (SCs) of variable composition Cs(x)FA(1-x)PbI(3 -y)Br(y) (x=0-0.1, y=0-0.6) which exhibit improved phase stability compared to the parent alpha-FAPbI(3) compound. These SCs possess outstanding electronic quality, manifested by a high-carrier mobility-lifetime product of up to 1.2 x 10(-1) cm(2) V-1 and a low dark carrier density that, combined with the high absorptivity of high-energy photons by Pb and I, allows the sensitive detection of gamma radiation. With stable operation up to 30 V, these novel SCs have been used in a prototype of a gamma-counting dosimeter.
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