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• W3191750276 abstract "The photovoltaic performance of chlorophyll (Chl)-based biosolar cells (BSCs) is increased greatly by introducing a P3HT layer on a base architecture of indium tin oxide (ITO)/compact TiO₂/mesoporous TiO₂/carboxylated Chl derivative (H₂Chl)/hydroxymethylated Chl derivative (ZnChl-Ar)/Ag. To reveal their working mechanism when the P3HT layer is introduced and provide further guidance to the next generation of device design, sub-picosecond transient absorption (TA) spectroscopy was employed to investigate their excitation dynamics. A dual charge separation mechanism by TiO₂––H₂Chl⁺ and H₂Chl––ZnChl-Ar⁺ species and the sole hole transportation function of P3HT are proposed for the device after introducing the P3HT layer. More specifically, the typical ZnChl-Ar⁺ cation signal disappeared when the P3HT layer was introduced, proving the cation (hole) extraction function of P3HT. Furthermore, a similar spectral shape of TA signals was observed in TiO₂/H₂Chl/ZnChl-Ar/P3HT and TiO₂/P3HT films except for a stronger signal with the introduction of the H₂Chl/ZnChl-Ar bilayer when pumped at 520 nm (noticing that P3HT is mainly excited in this situation). Such a phenomenon strongly implies that the H₂Chl/ZnChl-Ar intermediate effectively bridges the charge transfer of P3HT. Furthermore, no newly generated charge separation signal was observed between the ZnChl-Ar and P3HT interface, which proves that the P3HT layer only functions as a hole transporter rather than a photoactive layer in such Chl derivative-based BSCs." @default.
• W3191750276 created "2021-08-16" @default.
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• W3191750276 date "2020-01-01" @default.
• W3191750276 modified "2023-09-22" @default.
• W3191750276 title "Charge-Transfer Mechanism in Chlorophyll Derivative-based Biosolar Cells with Hole-Transporting P3HT Revealed by Sub-Picosecond Transient Absorption Spectroscopy" @default.
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