Global and target analysis of relaxation processes of the collapsed state of P3HT polymer nanoparticles.

Phys Chem Chem Phys

School of Materials Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India.

Published: January 2020

AI Article Synopsis

  • Organic-inorganic heterostructure materials show promise for improving light harvesting devices due to their ability to efficiently separate charges.
  • Researchers developed nano-heterostructures using poly(3-hexylthiophene-2,5-diyl) (P3HT) polymer nanoparticles and gold (Au) nanoparticles, studying their behavior through ultrafast transient absorption spectroscopy.
  • The study found that the lifetime of the singlet state in P3HT decreases significantly when nanoparticles are formed, and rapid electron transfers between the polymer and Au nanoparticles occur, highlighting the potential for optimizing these materials in light harvesting applications.

Article Abstract

Organic-inorganic heterostructure materials have received significant research interest for designing light harvesting devices because of their efficient charge separation. Here, we design organic and inorganic nano-heterostructures using conjugated polymer nanoparticles (PNPs) [poly(3-hexylthiophene-2,5-diyl), P3HT] and Au nanoparticles. We investigate the carrier relaxation processes of this heterostructure at different time scales by ultrafast transient absorption spectroscopy. The lifetime of the singlet state (S) of the pristine polymer shortens from 480.7 ps to 2.8 ps due to the formation of nanoparticles, and the formation of a delocalized collective state (CL) is obtained in polymer nanoparticles whose lifetime is found to be 384.6 ps. The hot and ultrafast electron transfers occur from P3HT polymer nanoparticles to Au nanoparticles and the time constants are 253 fs and 37.7 ps, respectively, which are responsible for the efficient charge separation in such heterostructures. Such a fundamental study of relaxation processes of organic-inorganic nano heterostructures is very significant for designing light harvesting systems.

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Source
http://dx.doi.org/10.1039/c9cp06600dDOI Listing

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