Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
DOI: https://doi.org/10.29363/nanoge.hopv.2018.021
Publication date: 21st February 2018
Mixed-halide perovskites have emerged as promising materials for optoelectronics due to the merit of their tunable bandgap in the entire visible region. A challenge remains however in the instability of the bandgap. This bandgap instability is attributed to phase-segregation, which strongly affects the voltage attained in mixed-halide perovskite-based solar cells and seriously restricts the applications. A comprehensive understanding toward phase-segregation is therefore highly desired to direct the further research and development for overcoming the restriction in applications of mixed-halide perovskites.
In this work, we provide an in-depth insight into this important yet unclear phenomenon with a combination of local-resolved and bulk investigations. We demonstrate phase-segregation in mixed-halide perovskite is highly topography-dependent. By using spatially-resolved photoluminescence spectroscopy, we show the gradual red-shift of the photoluminescence signal at the grain boundaries of mixed-halide perovskite during the consecutive laser illumination. Contrarily, we observe the spectrally stable emission exclusively stems from the grain centers. Such difference is further evidenced by the bulk characterizations, showing red-shift domain as a minority phase coexisting with the pristine one during illumination. By mapping the surface potential, we propose the higher concentration of positive space charge near grain boundary possibly provides the initial driving force for phase-segregation. Our work offers detailed insight into the microscopic processes occurring at the boundary of crystalline perovskite grains and will support the development of better passivation strategies, ultimately allowing to process environmentally stable perovskite films.
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