In situ and real-time ultrafast spectroscopy of photoinduced reactions in perovskite nanomaterials
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866910902593257472 |
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| author | Han, Gi Rim An, Mai Ngoc Jang, Hyunmin Han, Noh Soo Kim, JunWoo Jeong, Kwang Seob Yoon, Tai Hyun Cho, Minhaeng |
| author_facet | Han, Gi Rim An, Mai Ngoc Jang, Hyunmin Han, Noh Soo Kim, JunWoo Jeong, Kwang Seob Yoon, Tai Hyun Cho, Minhaeng |
| contents | Employing two synchronized mode-locked femtosecond lasers and interferometric detection of the pump-probe spectra -- referred to as asynchronous and interferometric transient absorption (AI-TA) -- we have developed a method for broad dynamic range and rapid data acquisition. Using AI-TA, we examined photochemical changes during femtosecond pump-probe experiments on all-inorganic cesium lead halide nanomaterials, including perovskite nanocrystals (PeNCs) and nanoplatelets (PeNPLs). The laser pulse train facilitates photoreactions while allowing real-time observation of charge carrier dynamics. In PeNCs undergoing halide anion photo-substitution, transient absorption spectra showed increasing bandgap energy and faster relaxation dynamics as the Cl/Br ratio increased. For colloidal PeNPLs, continuous observation revealed both spectral and kinetic changes during the light-induced coalescence of nanoplatelets, by analyzing temporal segments. This integrated technique not only deepens understanding of exciton dynamics and environmental influences in perovskite nanomaterials but also establishes AI-TA as a transformative tool for real-time observation of photochemical dynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_02331 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | In situ and real-time ultrafast spectroscopy of photoinduced reactions in perovskite nanomaterials Han, Gi Rim An, Mai Ngoc Jang, Hyunmin Han, Noh Soo Kim, JunWoo Jeong, Kwang Seob Yoon, Tai Hyun Cho, Minhaeng Mesoscale and Nanoscale Physics Materials Science Chemical Physics Employing two synchronized mode-locked femtosecond lasers and interferometric detection of the pump-probe spectra -- referred to as asynchronous and interferometric transient absorption (AI-TA) -- we have developed a method for broad dynamic range and rapid data acquisition. Using AI-TA, we examined photochemical changes during femtosecond pump-probe experiments on all-inorganic cesium lead halide nanomaterials, including perovskite nanocrystals (PeNCs) and nanoplatelets (PeNPLs). The laser pulse train facilitates photoreactions while allowing real-time observation of charge carrier dynamics. In PeNCs undergoing halide anion photo-substitution, transient absorption spectra showed increasing bandgap energy and faster relaxation dynamics as the Cl/Br ratio increased. For colloidal PeNPLs, continuous observation revealed both spectral and kinetic changes during the light-induced coalescence of nanoplatelets, by analyzing temporal segments. This integrated technique not only deepens understanding of exciton dynamics and environmental influences in perovskite nanomaterials but also establishes AI-TA as a transformative tool for real-time observation of photochemical dynamics. |
| title | In situ and real-time ultrafast spectroscopy of photoinduced reactions in perovskite nanomaterials |
| topic | Mesoscale and Nanoscale Physics Materials Science Chemical Physics |
| url | https://arxiv.org/abs/2504.02331 |