Temperature-Dependent Intensity Modulated Two-Photon Excited Fluorescence Microscopy for High Resolution Mapping of Charge Carrier Dynamics

Summary, in English

We present a temperature-dependent intensity modulated two-photon excited fluorescence microscopy technique that enables high-resolution quantitative mapping of charge carrier dynamics in perovskite microcrystal film. By disentangling the emission into harmonics of the excitation modulation frequency, we analyze the first and second order charge carrier recombination processes, including potential accumulation effects. Our approach allows for a quantitative comparison of different emission channels at a micrometer resolution. To demonstrate the effectiveness of the method, we applied it to a methylammonium lead bromide perovskite microcrystal film. We investigated the temperature-dependent modulated imaging, encompassing the exciton dissociation-association and charge carrier trapping-detrapping equilibrium. Additionally, we explored the potential freezing out of traps and the phase transition occurring at low temperatures.

• Author: Qi Shi; Pushpendra Kumar; Tönu Pullerits
• Department/s: Chemical Physics; NanoLund: Centre for Nanoscience; LTH Profile Area: Nanoscience and Semiconductor Technology; LTH Profile Area: Photon Science and Technology; LU Profile Area: Light and Materials; eSSENCE: The e-Science Collaboration
• Publishing year: 2023-09-27
• Language: English
• Pages: 467-476
• Publication/Series: ACS Physical Chemistry Au
• Volume: 3
• Issue: 5
• Links: http://dx.doi.org/10.1021/acsphyschemau.3c00013
• Document type: Journal article
• Publisher: The American Chemical Society (ACS)
• Topic: Physical Chemistry (including Surface- and Colloid Chemistry)
• Keywords: first-order recombination; intensity modulation technique; MAPbBr perovskite; phase transition; second-order recombination
• Status: Published
• ISBN/ISSN/Other: ISSN: 2694-2445