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Photocurrent measurements on aggregates in ladder-type poly(p-phenylene)

Title data

Köhler, Anna ; Grüner, J. ; Friend, Richard H. ; Müllen, Klaus ; Scherf, Ullrich:
Photocurrent measurements on aggregates in ladder-type poly(p-phenylene).
In: Chemical Physics Letters. Vol. 243 (1995) Issue 5-6 . - pp. 456-461.
ISSN 1873-4448
DOI: https://doi.org/10.1016/0009-2614(95)00840-Z

Abstract in another language

We report measurements of the photovoltaic effect on single layer devices made with a ladder-type poly-(paraphenylene) (LPPP). Besides the photocurrent in the blue spectral range associated with π to π∗ intra-chain absorption we observe an additional response in the yellow part of the spectrum centered at 2.25 eV. We also observe a weak absorption feature at the same energy, and we consider that both arise from absorption into π electron states formed over several aggregated polymer chains. The photocurrent due to excitation of these states is enhanced by two orders of magnitude compared to blue excitation and vanishes under reverse bias (i.e. ITO negative). We find that the photocurrent response due to the aggregate states is more sensitive to oxygen exposure than the response due to intra-chain absorption.

Further data

Item Type: Article in a journal
Refereed: No
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Mar 2015 10:38
Last Modified: 16 Apr 2018 11:33
URI: https://eref.uni-bayreuth.de/id/eprint/8493