Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates

Sumitendra Mazumdar, M. Chandross, Y. Shimoi, A. Chakrabarti, Neal R Armstrong, Nasser N Peyghambarian

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ultrafast spectroscopic studies of organic solids reveal features unexpected within simple noninteracting models for these systems. We consider: (a) organic mixed-stack charge-transfer solids, (b) conjugated polymers, and (c) aggregates of metal-halogen phthalocyanines, and show that in all cases the photophysics is dominated by excitons and bound multiexciton states. Theoretical modeling is simplest for charge-transfer solids, where stable multiexcitons are verified by femtosecond pump-probe spectroscopy as well as two-photon absorption. In conjugated polymers, pump-probe spectroscopy reveals features due to biexcitons as well as a low energy charge-transfer exciton. In both charge-transfer solids and conjugated polymers the biexcitons are bound by electron-electron Coulomb interactions. In contrast, the exciton-exciton binding in molecular aggregates can originate from various sources and the magnitude of the biexciton binding energy in these systems is considerably smaller. No evidence for a biexciton in molecular aggregates have found to date. We present the first experimental evidence for a biexciton in the H-aggregate of a metal-halogen-phthalocyanine. Biexcitons, well-established in conventional semiconductors, are therefore characteristic elementary excitations of several different classes of organic solids.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsZ.V. Vardeny, L.J. Rothberg
Pages69-80
Number of pages12
Volume3145
DOIs
StatePublished - 1997
EventOptical Probes of Conjugated Polymers - San Diego, CA, United States
Duration: Jul 28 1997Jul 30 1997

Other

OtherOptical Probes of Conjugated Polymers
CountryUnited States
CitySan Diego, CA
Period7/28/977/30/97

Fingerprint

Conjugated polymers
Charge transfer
Excitons
charge transfer
excitons
organic solids
polymers
halogens
pumps
probes
Pumps
Spectroscopy
elementary excitations
metals
Electrons
spectroscopy
Coulomb interactions
Metals
Binding energy
electrons

Keywords

  • Biexcitons in organic solids
  • Photophysics of organic solids

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Mazumdar, S., Chandross, M., Shimoi, Y., Chakrabarti, A., Armstrong, N. R., & Peyghambarian, N. N. (1997). Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates. In Z. V. Vardeny, & L. J. Rothberg (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3145, pp. 69-80) https://doi.org/10.1117/12.295541

Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates. / Mazumdar, Sumitendra; Chandross, M.; Shimoi, Y.; Chakrabarti, A.; Armstrong, Neal R; Peyghambarian, Nasser N.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / Z.V. Vardeny; L.J. Rothberg. Vol. 3145 1997. p. 69-80.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mazumdar, S, Chandross, M, Shimoi, Y, Chakrabarti, A, Armstrong, NR & Peyghambarian, NN 1997, Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates. in ZV Vardeny & LJ Rothberg (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 3145, pp. 69-80, Optical Probes of Conjugated Polymers, San Diego, CA, United States, 7/28/97. https://doi.org/10.1117/12.295541
Mazumdar S, Chandross M, Shimoi Y, Chakrabarti A, Armstrong NR, Peyghambarian NN. Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates. In Vardeny ZV, Rothberg LJ, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3145. 1997. p. 69-80 https://doi.org/10.1117/12.295541
Mazumdar, Sumitendra ; Chandross, M. ; Shimoi, Y. ; Chakrabarti, A. ; Armstrong, Neal R ; Peyghambarian, Nasser N. / Biexcitons in mixed-stack charge-transfer solids, conjugated polymers, and molecular aggregates. Proceedings of SPIE - The International Society for Optical Engineering. editor / Z.V. Vardeny ; L.J. Rothberg. Vol. 3145 1997. pp. 69-80
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