7/2/2023 0 Comments Download solar cabinThis study emphasizes the great promise of FRET and the central role of HT, and provides new guidelines to engineer FRET for high-efficiency OSCs. This synergistic two-step process facilitates spectral uniform photocurrent generation, also lower the non-radiative recombination energy loss by suppressing the formation of intermedia non-luminous CT exciton. In striking contrast to fullerene OSCs, the FRET process with efficiency over 65% is followed by reverse hole transfer (HT), bypassing direct electron transfer, becoming a more efficient charge generation channel in high-efficiency nonfullerene OSCs, especially for Y-series NFA based OSCs systems. Herein, by combining ultrafast spectroscopy and photovoltaic characterization, we unambiguously show the dominant ultrafast (~ 80 fs) and lossless Förster resonance energy transfer (FRET) from photoexcited polymer donors to Y6. Compared to the well explored hole transfer (HT) from photoexcited NFAs, its counterpart, the photoinduced process after donor light absorption and its implications for device performance remain unclear. The mysterious photoinduced charge generation process and its implications for device performance is a key issue for the state-of-the-art nonfullerene acceptors (NFAs) based Organic Solar Cells (OSCs).
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