Ultrafast charge separation and recombination dynamics in a nanometer thin film of polyimide observed by femtosecond transient absorption spectroscopy

Masahito Oh-E*, Tsuyoshi Asahi, Hiroshi Masuhara

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Femtosecond transient absorption spectroscopy was used to study how polyimide (PI) interacts with light in a nanometer-thick PI thin film. The PI containing pyromellitic diimide (PMDI) shows absorption by PMDI anions around 710 nm. Its decay occurs on two time scales: one is on the order of 10 ps and the other is on the order of a nanosecond. Each decay time is independent of the excitation wavelength and energy density, indicating that a geminate recombination would be dominant in a PI film. Under excitation by 390 nm light, the faster decay process shows one-photon absorption, but the slower decay process shows a two photon-absorption process.

Original languageEnglish
Pages (from-to)5840-5844
Number of pages5
JournalJournal of Physical Chemistry B
Volume106
Issue number23
DOIs
StatePublished - 13 Jun 2002

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