Organic semi-conductor photo-detecting device
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United States of America Patent
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Aug 21, 2012
Grant Date -
Oct 11, 2007
app pub date -
Mar 29, 2007
filing date -
Mar 31, 2006
priority date (Note) -
Expired
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Abstract
An organic photo-detecting field-effect device is presented, the device comprising a first layer comprising an organic semi-conducting material, the first layer acting as an accumulation layer and as a charge transport layer for a first type of charge carriers, and a second layer comprising a second material, the second layer acting as a an accumulation layer for a second type of charge carriers. Charges collected in the second layer influence the charge transport in the first layer. The second material may be an organic semi-conducting material or a metal. At the interface between the first layer and the second layer a heterojunction is formed in the case of an organic semi-conducting second material, and a Schottky barrier is formed in the case of a metal second material, giving rise to an efficient exciton splitting. Different geometries and operation modes facilitating the removal of the collected photo-generated charge carriers during the reset period of the device are presented. Furthermore, a method for operating an organic photo-detecting field-effect device is provided.
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