This article is cited in 1 paper

Amorphous, glassy, porous, organic, microcrystalline semiconductors, semiconductor composites

Structural features of the photogeneration mechanism of free charge carriers in element-containing polydisalicylidene azomethine series

E. L. Alexandrova^a, A. G. Ivanov^b, N. M. Geller^b, V. V. Shamanin<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg

Abstract: Photophysical properties of new polytetra- and polydisalicylidene azomethines (PSAMs) with chains containing Si, Ge, Sn, or transition metal atoms and atoms of a number of other divalent metals are studied. Based on data on ultraviolet and infrared spectra, it was found that the noncovalent transannular donor-acceptor interaction N $\to$ M (M is semimetal or metal) occurs in polymers, which leads to the formation of a polymer chain of six-membered cycles. As a result, polyconjugations arise in PSAMs by a “non-classical” mechanism. Due to multiple donor-acceptor interactions of unshared electron pairs of azomethine groups with vacant $d$-orbitals in metals, polymers feature conductive, photosensitive, and photoconductive properties. The photosensitivity and quantum yield of photogeneration of free charge carriers for PSAMs are close to the values characteristic of classical conducting polymers. It was shown that the PSAM properties are controlled by the azomethine fragment structure and acceptor properties of metal. A mechanism of free carrier photogeneration was suggested.

Received: 23.09.2009
Accepted: 29.09.2009

 English version: Semiconductors, 2010, 44:5, 634–641

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