Broadband pump-probe spectroscopy over the entire time range (200 fs to 500 ns) relevant to monitor the polaron
generation and recombination dynamics were performed on the bulk heterojunction composites of poly (3-
hexylthiophene) (P3HT) and poly(3-hexylthiophene-thiophene-diketopyrrolopyrrole) (P3HTT-DPP-10%) with [6,6]-
phenyl-C61-butyric acid methyl ester (PCBM) as the acceptor. The modeling of the polaron dynamics with the Debye-
Smoluchowski diffusion model provides the charge separation length at the polymer:fullerene interface. Furthermore, the
computed polaron yield using the polaron cross-section over the entire time range reveals the amount of photo-generated
charges in P3HT:PCBM and P3HTT-DPP-10%:PCBM bulk-heterojunction thin films.
Saptaparna Das, Alia A. Latif, William Thornbury, Barry C. Thompson, and Stephen E. Bradforth, "Absolute polaron yield of donor-acceptor P3HT:fullerene bulk heterojunction composites," Proc. SPIE 9549, Physical Chemistry of Interfaces and Nanomaterials XIV, 95490N (Presented at SPIE Nanoscience + Engineering: August 10, 2015; Published: 20 August 2015); https://doi.org/10.1117/12.2189531.
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