Organic diodes with switchable photosensitivity
AssigneeDuPont Displays, Inc.
InventorsGang Yu, Yong Cao
Life of this patent
Estimating the term…
Abstract
Organic diode detectors with switchable photosensitivity are achieved using organic photo layers in the photodiodes and a detector circuit which applies a reverse or forward bias voltage across the diodes. The diodes can be arranged in matrices which function as high performance, two-dimensional image sensors. These image sensors can achieve full color or selected color detection capability.
Claims58
A switchable organic photodiode detector comprising a photodiode and a voltage source, said photodiode having a built-in potential and comprising:
- a support substrate;
- a first electrode disposed on said support substrate;
- a photoactive organic layer disposed on said first electrode;
- a second electrode disposed on said photoactive organic layer;
- and
- said voltage source adapted to selectively apply a switching voltage across said first electrode and said second electrode, said switching voltage imparting a photosensitivity above 1 mA/W at an operating reverse or forward bias and near-zero photosensitivity at a cut-off bias substantially equivalent in magnitude to said built-in potential.
A scannable array of voltage switchable organic photodiodes each having a built-in potential and a predetermined photosensitivity range, said array comprising:
- a support substrate;
- a first electrode layer comprising at least one linear electrode disposed on said support substrate along a first direction;
- a photoactive organic layer disposed on said linear electrode;
- a second electrode layer comprising a plurality of linear electrodes disposed on said photoactive layer along a second direction transverse to said first direction;
- and
- a voltage source adapted to apply a switching voltage across at least one electrode of said first electrode layer and at least one electrode of said second electrode layer, said switching voltage thereby imparting to at least one selected photodiode a photosensitivity above 1 mA/W at an operating bias and near-zero photosensitivity at a cut-off bias substantially equivalent in magnitude to said built-in potential.
An organic photodiode detector comprising a photodiode and a voltage source, said photodiode having a built-in potential and a prescribed photosensitivity range in response to incident radiation, said photodiode comprising:
- a support substrate;
- a first electrode disposed on said support substrate;
- a photoactive organic layer disposed on said first electrode;
- a second electrode disposed on said photoactive organic layer;
- and
- said voltage source adapted to apply an operating biasing voltage across said first electrode and said second electrode, said biasing voltage operating to vary said prescribed photosensitivity range.
Dependencies are inferred from the claim text.