Absolute polaron yield of donor-acceptor P3HT:fullerene bulk heterojunction composites

Saptaparna Das; Alia A. Latif; William Thornbury; Barry C. Thompson; Stephen E. Bradforth

doi:10.1117/12.2189531

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20 August 2015 Absolute polaron yield of donor-acceptor P3HT:fullerene bulk heterojunction composites

Saptaparna Das, Alia A. Latif, William Thornbury, Barry C. Thompson, Stephen E. Bradforth

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Proceedings Volume 9549, Physical Chemistry of Interfaces and Nanomaterials XIV; 95490N (2015) https://doi.org/10.1117/12.2189531
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

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.

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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 (20 August 2015); https://doi.org/10.1117/12.2189531

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