Transient absorption spectroscopy (TAS) is a time-resolved spectroscopic technique that can quantitatively observe temporal changes in the absorption spectrum associated with transient species, such as excitons and charges.

Jun 27, 2024 · Here we demonstrate a general strategy based on vitamin C to stabilize n-type OSCs, remarkably improving the performance and stability of their device, for example, organic field-effect...

Apr 19, 2023 · The findings in the steady-state absorption spectra are reflected in the TA, where we observe an enhanced formation of interchain PPs in aged D18 (Figures S30 and S31), with little difference between the fresh and aged PTQ10 films (Figure S35).

Jul 20, 2022 · In addition, new bleach signals in the region between 570 and 620 nm appear in the TA spectra of the three blends, which is consistent with the steady-state absorption features of PM6, suggesting an ultrafast HT process from Y6 to PM6.

Download scientific diagram | Femtosecond (fs) transient absorption (TA) spectroscopy of binary and ternary blends. a–c) Color plots of TA spectra of PDBD‐TF:Y6, PDBD‐TF:Y6:BTTPC (10%), and...

Feb 16, 2024 · Transient absorption (TA) spectroscopy is a time-resolved spectroscopic technique that monitors the evolution of photo-excited species through time-dependent changes to their absorption spectrum following excitation with a pulse of light.

We give a general framework for understanding high-order TA spectra. We extend to higher order the fundamental processes of standard TA: ground-state bleach (GSB), stimulated emission (SE), and excited-state absorption (ESA).

Jan 17, 2023 · Gillett et al. showed with TA spectroscopy that in the blend PM6:Y6 ≈90% of the non-geminately recombined CT states undergo HBT to the NFA triplet. In contrast, the ISC yield in neat Y6 is ≈3%, further reduced in the blends due to a significant charge transfer of 90% upon photoexcitation. [ 3 ]

3.5 Methods of measuring TA spectra. There are two methods of measuring TA data: kinetic mode and spectral mode. Kinetic mode looks at a single wavelength and measures the evolution of the signal at that wavelength over time, then the process is repeated at another wavelength until all wavelengths of interest are covered and the spectrum is built.

Feb 16, 2024 · Transient absorption (TA) spectroscopy is a powerful time-resolved spectroscopic method used to track the evolution of excited-state processes through changes in the system's absorption spectrum.