Fig. 3: Charge transport properties of perylene-based COFs.
From: Dimensional evolution of charge mobility and porosity in covalent organic frameworks
a Schematic of time-resolved terahertz spectroscopy (TRTS). In the scheme, \({\Delta }t\) represents the relative time delay between the optical pump and the THz probe, and \({\Delta }E\) stands for the relative change of the THz electric field. b Time-resolved photoconductivity normalized by absorbed photon density (\({\Delta }{\sigma }/{N}_{{abs}}\)) of perylene-based COFs. c Frequency-resolved photoconductivity (\(\Delta \sigma \left(\omega \right)\)) of perylene-based COFs measured at 0.5 ps after the maximum photoconductivity. The filled and empty circles represent the real and imaginary components of the complex THz photoconductivity of 1D Pery-COF (red), 2D ML-Pery-COF (blue, rescaled by 1.24 ×), and 2D PL-Pery-COF (black, rescaled by 2.09 ×). The red and purple solid lines correspond to the global fitting of the real and imaginary components of \(\Delta \sigma \left(\omega \right)\) following the Drude-Smith (DS) model. d Correlation between the relative mobility (\({\Delta }{\sigma }/{N}_{{abs}}\)) of perylene-based COFs and the inverse of their electron-hole reduced effective masses (\(1/{m}^{*}\)). The error bars represent the standard deviation, estimated from point-to-point variation.
