Organic photodiodes, organic x-ray detectors and x-ray systems

A method of forming an organic photodiode, comprising:

• disposing an organic absorber layer on a first electrode;
• disposing a second electrode on the organic absorber layer;
• and
• disposing a first charge blocking layer comprising a metal fluoride between the organic absorber layer and one of the first electrode or the second electrode, wherein the metal fluoride comprises lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, iron, yttrium, ytterbium, or combinations thereof, wherein the charge blocking layer is substantially free of an electrically conductive material, and wherein the thickness of the charge blocking layer is greater than about 10 nanometers.

An organic x-ray detector, comprising:

• a thin-film transistor (TFT) array disposed on a substrate;
• an organic photodiode disposed on the TFT array, wherein the organic photodiode comprises:
• a first electrode;
• an organic absorber layer disposed on the first electrode;
• a second electrode disposed on the organic absorber layer;
• and
• a first charge blocking layer comprising a metal fluoride disposed between the organic absorber layer and one of the first electrode or the second electrode, wherein the metal fluoride comprises lithium, sodium, potassium, rubidium, cesium, beryllium, magnesium, calcium, strontium, barium, iron, yttrium, ytterbium, or combinations thereof, wherein the charge blocking layer is substantially free of an electrically conductive material, and wherein the thickness of the charge blocking layer is greater than about 10 nanometers;
• and
• a scintillator layer disposed on the organic photodiode.