Direct experimental evidence for photoinduced strong-coupling polarons in organolead halide perovskite nanoparticles
- Lund Univ., Lund (Sweden)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Qatar Univ., Doha (Qatar)
- Univ. of Hamburg, Hamburg (Germany)
Echoing the roaring success of their bulk coun-terparts, nano-objects built from organolead halide perov-skites (OLHP) present bright prospects for surpassing the performances of their conventional organic and inorganic analogues in photodriven technologies. Unraveling the pho-toinduced charge dynamics is essential for optimizing OLHP optoelectronic functionalities. However, mapping the carri-er-lattice interactions remains challenging, owing to their manifestations on multiple length scales and time scales. By correlating ultrafast time-resolved optical and X-ray absorp-tion measurements, this work reveals the photoinduced formation of strong-coupling polarons in CH3NH3PbBr3 nanoparticles. Such polarons originate from the self-trapping of electrons in the net Coulombic field caused by the dis-placed inorganic nuclei and the oriented organic cations. The transient structural change detected at the Pb L3 X-ray ab-sorption edge is well captured by a distortion with average bond elongation in the [PbBr6]2- motif. As a result, general implications for designing novel OLHP nanomaterials targeting the active utilization of these quasi-particles are outlined.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Scientific User Facilities Division; Knut and Alice Wallenberg Foundation; Swedish Research Council (SRC)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1369031
- Journal Information:
- Journal of Physical Chemistry Letters, Vol. 7, Issue 22; ISSN 1948-7185
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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