Device comprising a bipolar semi-conducting film

US6429040B1 · kind B1 · utility

Assignee

• Agere Systems Guardian Corporation · US

Inventors

• Zhenan Bao · Lyndhurst, US
• Xiaochen Chen · Shanghai, CN

Key dates

• Filing date: Apr 6, 2000
• Grant date: Aug 6, 2002
• Expiry date: Apr 6, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10K85/154

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 10−3 cm2/Vs when operating as an n-type or p-type device.