Publication date: 22nd July 2026
Inorganic halide perovskites present unique light-dependent characteristics, enabling their implementation as active components within switchable photonic devices. We have experimentally demonstrated optical switchability in the mid-infrared (MIR) transmission from 3–20 μm as a direct result of the material’s lattice distortion, which creates polaron-like states [1]. We measured up to 10% changes in transmission, with modulation times <1 millisecond, and multi-state response. Moreover, we demonstrate transient, lattice distortions in single crystal MAPbBr3, FAPbBr3, and CsPbBr3 in response to above-bandgap light excitation. Using an X-ray probe, we unravel fully reversible and hysteresis-free photoinduced lattice deformation [2]. CsPbBr3 shows the highest resilience against lattice deformation with a 0.062% change in its out-of-plane lattice parameter. Yet, the organic cations led to more significant yet elastic distortion, with MAPbBr3 exhibiting up to 0.3% change. Overall, our results establish halide perovskites as potential building blocks for photostriction and switchable photonic devices.
[1] Science Advances, in press (2026).
[2] Adv. Materials, online (2026). DOI: 10.1002/adma.202521800
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