Effect of film structure on CH3NH3PbI3 perovskite thin films’ degradation
Source abstract
Abstract
The instability of CH3NH3PbI3 perovskite hybrid organic–inorganic films is a serious problem, which might be a drawback for their use in solar energy conversion. In this work, we have evaluated the degradation of the perovskite films and studied the influence of film morphology on their degradation. CH3NH3PbI3 perovskite thin films were deposited on glass substrates by a spin coating technique at different centrifugation speeds using different solvents. This study aims to determine the films’ properties that may control the degradation process. This study was based on the comparison between the characteristics determined from XRD analysis and optical transmittance of freshly deposited films and those aged 1 year in ambient air at room temperature and dark conditions. The degradation was manifested by the partial decomposition of the perovskite to PbI2, I2, and metallic lead. The degradation evaluation was achieved by the determination of the variation of the most intense XRD diffraction peak in the freshly prepared film and after aging. The results indicated that the degradation is very sensitive to the films’ porosity and thickness. Reducing the thickness of the film or increasing the porosity enhances the degradation process.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Equipe Couche Minces et Environnement, Faculté de Science, Université Frères Mentouri 1 , Constantine 25000, Algeria
Département de Génie Industriel, Faculté Sciences et Technologie, Université Abbes Laghrour 2 , Khenchela 40000, Algeria
Department of Physics, Faculty of Science, King Abdulaziz University 3 , Djeddah 21589, Saudi Arabia
Center of Nanotechnology, King Abdulaziz University 4 , Djeddah 21589, Saudi Arabia
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