Enhancing two-dimensional electronic spectroscopy for layered halide perovskites
The photophysics of layered halide perovskites reveals a rich disposition of exciton behavior. Two-dimensional electronic spectroscopy (2DES) is a powerful technique for investigating such excitonic interactions and dynamics. However, the wide spectral range of layered perovskites presents a challen...
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| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/172521 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The photophysics of layered halide perovskites reveals a rich disposition of exciton behavior. Two-dimensional electronic spectroscopy (2DES) is a powerful technique for investigating such excitonic interactions and dynamics. However, the wide spectral range of layered perovskites presents a challenge in studies utilizing conventional 2DES setups to simultaneously probe their interacting excitonic states. Herein, we put forward a versatile 2DES setup employing a hollow-core fiber compressor (HCFC) to generate stable and optimized broadband laser pulses (6 fs) covering a spectral range of 500–950 nm. 2D spectra with high temporal and spectral resolution are possible even with a pulse-shaper-based commercial 2DES setup. Application to a representative two-phase Ruddlesden–Popper perovskite thin film reveals well-defined signals at the diagonal and off-diagonal positions, indicative of exciton delocalization between the two transitions. Our straightforward modification of a commercial 2DES setup extends its capabilities to investigate the large family of layered perovskites currently under intense scrutiny in the development of perovskite optoelectronics. |
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