Beilstein J. Nanotechnol.2018,9, 1695–1704, doi:10.3762/bjnano.9.161
photostriction can be simultaneously investigated by implementing a specific protocol based on the acquisition of the tip height and surface potential during illumination sequences. The obtained data confirm the existence of lattice expansion under illumination in MAPbBr3 and that negative photocarriers
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Keywords: carrier lifetime; ion migration; Kelvin probe force microscopy (KPFM); noncontact atomic force microscopy (nc-AFM); organic–inorganic hybrid perovskites; photostriction; single crystals; surface photovoltage (SPV); time-resolved surface photovoltage; Introduction
Organic–inorganic hybrid
, KPFM investigations of hybrid perovskite single crystals remain rather limited [14][15].
Another important point to consider is the existence of photostriction effects, which have actually been observed in MAPbI3 and MAPbBr3 single crystals [16][17]. In the most general terms, photostriction can be
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Figure 1:
(a) nc-AFM topographic image (2 × 2 μm) of the MAPbBr3 single crystal surface. The dotted rectangle...