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Femtosecond Transient Absorption (TA) spectra for PM6:Y11 in the IR spectral region. The pump wavelength was 800 nm, selectively exciting Y11. We identify two signals in the spectra: an inter-CT state PIA in the region 1500–1600 nm and a triplet exciton PIA in the region 1400–1500 nm. The full TA spectra for PM6:Y11 in the visible and NIR/IR regions are given in FigureS9(Supporting Information), where the most prominent spectral features are identified.

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