Device comprising a bipolar semi-conducting film
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United States of America Patent
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Aug 6, 2002
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app pub date -
Apr 6, 2000
filing date -
Apr 6, 2000
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Abstract
An organic semiconducting material having bi-polar charge transport characteristics is described which may comprise the active layer of a field-effect transistor. The semiconducting material comprises a bi-polar polymeric film effective for hole or electron transport comprising a polymer having a conjugated framework with functional moieties capable of solvating ions or promoting ionic charge transport. The conjugated framework is selected from at least one of thiophene, pyrrole, benzene, naphthalene, antrhacene, and antrhacene-dione, and the functional moieties are selected from (i) functional side groups comprising salts of carboxylic acid and sulfonic acid and (ii) functional sites selected from heteroatoms having electron lone pairs comprising sulfur, nitrogen, and oxygen. The field-effect mobility of the bi-polar polymeric film is at least 10.sup.-3 cm.sup.2 /Vs when operating as an n-type or p-type device.
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