Organic image sensors without color filters

An organic/inorganic stacked image sensor, comprising:

• a plurality of inorganic photoelectric conversion devices within a semiconductor substrate;
• an organic photoelectric conversion layer on the semiconductor substrate, the organic photoelectric conversion layer including a first material and a second material, the first material configured to absorb a first wavelength spectrum of light, the second material configured to absorb a second wavelength spectrum of light, wherein the organic photoelectric conversion layer includes a lower layer and an upper layer stacked upon the lower layer, a material composition of the lower layer being a first mixture of the first and second materials, a material composition of the upper layer being a second mixture of the first and second materials, wherein a ratio of the first material to the second material in the first mixture is greater than 1/1, and a ratio of the first material to the second material in the second mixture is less than 1/1;
• and
• first and second organic photoelectric conversion devices, the first organic photoelectric conversion device including a first portion of the organic photoelectric conversion layer and configured to absorb one wavelength spectrum of light of the first wavelength spectrum of light and the second wavelength spectrum of light, the second organic photoelectric conversion device including a separate, second portion of the organic photoelectric conversion layer and configured to absorb a separate wavelength spectrum of light of the first wavelength spectrum of light and the second wavelength spectrum of light,
• wherein each inorganic photoelectric conversion device of the plurality of inorganic photoelectric conversion devices is configured to absorb a third wavelength spectrum of light which is not absorbed by the first organic photoelectric conversion device and the second organic photoelectric conversion device,
• wherein the organic/inorganic stacked image sensor does not include any color filter device.

An organic image sensor, comprising:

• an organic photoelectric conversion layer including a first material and a second material, wherein the organic photoelectric conversion layer includes a lower layer and an upper layer stacked upon the lower layer, a material composition of the lower layer being a first mixture of the first and second materials, a material composition of the upper layer being a second mixture of the first and second materials, wherein a ratio of the first material to the second material in the first mixture is greater than 1/1, and a ratio of the first material to the second material in the second mixture is less than 1/1;
• a common electrode on one side of the organic photoelectric conversion layer;
• and
• a plurality of pixel electrodes on an opposite side of the organic photoelectric conversion layer,
• wherein the organic image sensor is configured to apply different voltages to separate pixel electrodes of the plurality of pixel electrodes, and
• wherein the first material is configured to absorb a first wavelength spectrum of light and the second material is configured to absorb a second wavelength spectrum of light, and
• wherein charges absorbing blue light are transported through the lower layer when a first voltage bias is applied to the organic image sensor to detect the blue light, charges absorbing red light are transported through the upper layer when a second voltage bias is applied to the organic image sensor to detect the blue light and the red light, and the second voltage bias is higher than the first voltage bias.

An organic image sensor, comprising:

• an organic photoelectric conversion layer including a first material and a second material, the first material configured to absorb a first wavelength spectrum of light, the second material configured to absorb a second wavelength spectrum of light, wherein the organic photoelectric conversion layer includes a lower layer and an upper layer stacked upon the lower layer, a material composition of the lower layer being a first mixture of the first and second materials, a material composition of the upper layer being a second mixture of the first and second materials, wherein a ratio of the first material to the second material in the first mixture is greater than 1/1, and a ratio of the first material to the second material in the second mixture is less than 1/1;
• a common electrode on one side of the organic photoelectric conversion layer;
• a plurality of pixel electrodes on an opposite side of the organic photoelectric conversion layer;
• an interlayer insulating layer directly on a lower surface of the plurality of pixel electrodes and an exposed lower surface of the organic photoelectric conversion layer;
• a semiconductor substrate on the interlayer insulating layer, the semiconductor substrate including a charge storage section configured to store a charge accumulated in a first organic photoelectric conversion device and a second organic photoelectric conversion device;
• an inorganic photoelectric conversion device at least partially in the semiconductor substrate, the inorganic photoelectric conversion device configured to absorb a third light that is different from the first wavelength spectrum of light and the second wavelength spectrum of light;
• and
• a contact in the interlayer insulating layer, the contact configured to couple the first organic photoelectric conversion device and the second organic photoelectric conversion device with the charge storage section.