Unveiling high-mobility hot carriers in a two-dimensional conjugated coordination polymer
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Hot carriers, inheriting excess kinetic energy from high-energy photons, drive numerous optoelectronic applications reliant on non-equilibrium transport processes. Although extensively studied in inorganic materials, their potential in organic-based systems remains largely unexplored. Here we demonstrate highly mobile hot carriers in crystalline two-dimensional conjugated coordination polymer Cu3BHT (BHT, benzenehexathiol) films. Leveraging a suite of ultrafast spectroscopic and imaging techniques, we map the microscopic charge transport landscape in Cu3BHT films following non-equilibrium photoexcitation across temporal, spatial and frequency domains, revealing two distinct high-mobility transport regimes. In the non-equilibrium regime, hot carriers achieve an ultrahigh mobility of ~2,000 cm2 V–1 s–1, traversing grain boundaries up to ~300 nm within a picosecond. In the quasi-equilibrium regime, free carriers exhibit Drude-type, band-like transport with a remarkable mobility of ~400 cm2 V–1 s–1 and an intrinsic diffusion length exceeding 1 μm. These findings position two-dimensional conjugated coordination polymers as versatile platforms for advancing organic-based hot carrier applications.
Details
| Original language | English |
|---|---|
| Pages (from-to) | 1457 - 1464 |
| Number of pages | 8 |
| Journal | Nature materials |
| Volume | 24 |
| Issue number | 9 |
| Early online date | 13 May 2025 |
| Publication status | Published - Sept 2025 |
| Peer-reviewed | Yes |
External IDs
| Scopus | 105005408408 |
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| PubMed | 40360871 |