Abstract
Organometal halide perovskite-based optoelectronic devices are currently a hot research area owing to their unique properties, but widespread commercialization is plagued by their poor long-term stability. So far, the degradation mechanism of organometal halide perovskites is still indistinct due to limited real time systematic study. In this work, we in situ study the crystal evolution of an organometal halide perovskite CH3NH3PbI3, which is prepared on different kinds of framework substrates. Based on the in situ grazing incidence X-ray diffraction and X-ray near absorption edge spectrum, we observe the formation of some 2D networks of [PbI6]4− octahedra intermediates during CH3NH3PbI3 degradation in a moist environment at the early step of the degradation mechanism. We also show that the structural stability of CH3NH3PbI3 deposited anodic TiO2 nanotube substrates is relatively better than that of prepared perovskite on TiO2 nanoparticles in moisture. The confinement of the 3D [PbI6]4− octahedral crystal network probability reduces the ion migration by regular pores of crystalline TiO2 nanotubes, improving the stability of the organometal halide perovskite. Furthermore, the X-ray excited luminescence intensity of CH3NH3PbI3 fabricated on TiO2 nanotubes is boosted 88% compared with that of conventional TiO2 nanoparticle substrates, which demonstrates its potential application in scintillation detectors.
Highlights
Organometal halide perovskites, CH3NH3PbX3 (X 1⁄4 Cl, Br, I), have become a popular topic with regard to optoelectronic devices in recent years
Despite signi cant progress in organometal halide perovskite-based optoelectronic devices, widespread commercialization is plagued by their poor long-term stability
We study the degradation of the organometal halide perovskite CH3NH3PbI3 on both conventional porous TiO2 nanoparticles (NPs) and anodic TiO2 nanotubes (NTs) to locate the intermediate substance and evaluate the substrate effect on degradation in a moist environment
Summary
Organometal halide perovskites, CH3NH3PbX3 (X 1⁄4 Cl, Br, I), have become a popular topic with regard to optoelectronic devices in recent years. We study the degradation of the organometal halide perovskite CH3NH3PbI3 on both conventional porous TiO2 nanoparticles (NPs) and anodic TiO2 nanotubes (NTs) to locate the intermediate substance and evaluate the substrate effect on degradation in a moist environment. Both the surface and bulk crystal structure evolution of such perovskites is investigated using synchrotron-based high-resolution 2D GIXRD with different incident X-ray angles in controlled moisture in situ. The peak luminescence of CH3NH3PbI3/TiO2 NTs was improved 88% compared with the conventional TiO2 nanoparticle substrate
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