Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202010076
Keywords
cascaded bandgap; energy funneling; layered perovskites; perovskite light emitting diodes; perovskite solar cells
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Funding
- FWO international mobility grant [V424419N]
- European Research Council under the European Horizon 2020 Programme/ERC grant [835133]
- Lithuanian Research Council [01.2.2-LMT-K-718-03-0048]
- Deutsche Forschungsgemeinschaft (DFG) within the framework of the Collaborative Research Center [SFB-1214]
- Projekt DEAL
- European Research Council (ERC) [835133] Funding Source: European Research Council (ERC)
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The study combines transient absorption and transient photoluminescence techniques to investigate excited state dynamics in heterogenous quasi-2D perovskite films over a wide temperature range. The data clearly show that charge carrier transfer dominates in these materials, providing valuable insights into their optoelectronic properties.
Heterogeneous organic-inorganic halide perovskites possess inherent non-uniformities in bandgap that are sometimes engineered and exploited on purpose, like in quasi-2D perovskites. In these systems, charge carrier and excitation energy migration to lower-bandgap sites are key processes governing luminescence. The question, which of them dominates in particular materials and under specific experimental conditions, still remains unanswered, especially when charge carriers comprise excitons. In this study transient absorption (TA) and transient photoluminescence (PL) techniques are combined to address the excited state dynamics in quasi-2D and other heterogeneous perovskite structures in broad temperature range, from room temperature down to 15 K. The data provide clear evidence that charge carrier transfer rather than energy migration dominates in heterogeneous quasi-2D perovskite films.
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