AI Article Synopsis
- Electronic doping in colloidal quantum wells (CQWs) enhances their optical and electronic properties, leading to potential advancements in optoelectronic devices.
- Researchers have observed a significant phonon cascade process with up to 27 sound-like phonon replicas in copper (Cu) emissions at room temperature, highlighting a strong interaction between electrons and phonons.
- The study reveals an unusually high Huang-Rhys factor in Cu-doped CQWs, suggesting that the electron-phonon coupling is much stronger than previously thought, challenging the belief that such coupling is weak in quantum-confined systems.
Article Abstract
Electronic doping has endowed colloidal quantum wells (CQWs) with unique optical and electronic properties, holding great potential for future optoelectronic device concepts. Unfortunately, how photogenerated hot carriers interact with phonons in these doped CQWs still remains an open question. Here, through investigating the emission properties, we have observed an efficient phonon cascade process (i.e., up to 27 longitudinal optical phonon replicas are revealed in the broad Cu emission band at room temperature) and identified a giant Huang-Rhys factor ( ≈ 12.4, more than 1 order of magnitude larger than reported values of other inorganic semiconductor nanomaterials) in Cu-doped CQWs. We argue that such an ultrastrong electron-phonon coupling in Cu-doped CQWs is due to the dopant-induced lattice distortion and the dopant-enhanced density of states. These findings break the widely accepted consensus that electron-phonon coupling is typically weak in quantum-confined systems, which are crucial for optoelectronic applications of doped electronic nanomaterials.
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| http://dx.doi.org/10.1021/acs.nanolett.2c03427 | DOI Listing |
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