Reversible photoswitching behavior in bulk resistance and in color of polycrystalline AgI at room temperature

Abstract

A photoinduced reversible change in bulk resistance of polycrystalline AgI is observed at room temperature. The original yellow color of the sample changes to dark brown with UV (308 nm) photoirradiation, associated with the small decrease in the bulk resistance. A reversible switching of color between dark brown and yellow is observed by alternative UV-visible photoirradiation, associated with a switching between high and low resistance states. The observed reversible photoswitching is interpreted in terms of the photoinduced reversible change in the β-γ-polytype stacking structure of the polycrystalline AgI.

Illumination Power-Dependent Electroabsorption of Excitons in a CH3NH3PbI3 Perovskite Film

“…As we reported for a silver iodide crystal , and as reported for MAPbI 3 crystal, ionic conductivity can be altered by photoirradiation. Then, it is also interesting to know how the present illumination power dependence of E-A spectra is related to illumination power dependence of ionic conductivity of MAPbI 3 film, which will be also examined as a future work.…”

Synthesis and optical properties of hybrid “plasmon-exciton” nanostructures based on Ag-AgI in nanoporous silica glass

“…AgI nanocrystal photolysis generates silver neutral atoms and nanoclusters which can form silver nanoparticles exhibiting the plasmon resonance. As other silver halides [12,13], AgI features pronounced nonlinear optical properties [14,15].…”

Femtosecond optical diagnostics of interlevel energy relaxation in the band gap of silver iodide nanocrystals

“…This is explained by not only their unique photophysical and chemical properties, but also their wide application in photogra phy [1]; holography [2][3][4]; and production of photo chromic [5][6][7], nonlinear optical [8][9][10][11], and other functional materials. Silver iodide (AgI) is a superionic conductor; it is characterized by "slow" photo chromism [6,7] and is used in solid electrolytes, pho tography, microelectronics, optoelectronics, and sen sorics.…”

“…It is known [7] that the unstable γ AgI phase has a higher absorption coefficient in the visible spectral range than β AgI and can coexist with the latter at room temper ature. It was shown in [7] that irradiation of β AgI by UV light under stationary conditions leads to the for mation of γ AgI.…”

“…It is known [7] that the unstable γ AgI phase has a higher absorption coefficient in the visible spectral range than β AgI and can coexist with the latter at room temper ature. It was shown in [7] that irradiation of β AgI by UV light under stationary conditions leads to the for mation of γ AgI. The possibility of ultrafast (τ < 0.5 ps) photoinduced semiconductor-metal phase transition was experimentally demonstrated in [23,24] for vana dium dioxide.…”