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Influence of annealing on stability and regeneration of degraded CH3NH3PbI3 thin films

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Abstract

In this study, wet chemical synthesis has been used to synthesize methyl ammonium lead iodide (CH3NH3PbI3). Spin-coating method has been employed to deposit CH3NH3PbI3 thin films of varying thicknesses on glass substrates. These samples were stored in vacuum desiccators and monitored over a 160-day period to investigate the degradation mechanism of perovskite thin films. To address the degradation issue, the degraded films were annealed at 70 °C for 30 min. During degradation, XRD data indicated a decrease in the intensity of CH3NH3PbI3 peaks and an increase in PbI2 peaks. After annealing, the intensity of CH3NH3PbI3 peaks was partially restored, but PbI2 was still present. Similarly, FESEM analysis revealed the presence of white, minute powder-like particles on the degraded samples and EDS data confirmed the presence of oxygen. However, the oxygen percentage decreased after annealing, and the white minute particles diffused. Subsequent analysis indicated that annealing partially restored the degraded films. Therefore, thermal annealing appears to be a possible solution to regenerate the degraded perovskite thin films.

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Data Availability

The data supporting the findings of this study are available in the main text and supplementary information will be additionally available upon request from the corresponding author.

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Acknowledgements

The authors acknowledge Central Research Facilities, KIIT Deemed to be University for providing FESEM facilities.

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Authors and Affiliations

  1. School of Applied Sciences, Kalinga Institute of Industrial Technology (KIIT), Bhubaneswar, 751024, India

    Ipsita Mohanty, Samaresh Jana & Sutanu Mangal

  2. School of Electronics Engineering, Kalinga Institute of Industrial Technology (KIIT), Bhubaneswar, 751024, India

    Udai P. Singh

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  1. Ipsita Mohanty
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  2. Udai P. Singh
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  3. Samaresh Jana
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  4. Sutanu Mangal
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Contributions

IM: investigation, visualization, formal analysis, writing- original draft preparation, data curation. UPS: validation, supervision. SJ: methodology, resources. SM: resources, writing- reviewing and editing, conceptualization, project administration, supervision.

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Correspondence to Sutanu Mangal.

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Mohanty, I., Singh, U.P., Jana, S. et al. Influence of annealing on stability and regeneration of degraded CH3NH3PbI3 thin films. Appl. Phys. A 130, 143 (2024). https://doi.org/10.1007/s00339-023-07263-z

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  • DOI: https://doi.org/10.1007/s00339-023-07263-z

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