| Organic photodetectors mainly include organic photodiodes?OPDs?and organic phototransistors.Among them,the organic photodiode has gained wide attention and research due to its advantages of flexible material selection,simple structure,low temperature processing on a large area substrate,and the like.This text mainly includes the following content:?1?Introduced the types and performance parameters of inorganic photodiode;and the development of organic photodiode,structural classification and performance parameters.?2?In order to optimize the thickness of anode modified layer,OPDs based on CuPc/C60 planar heterojunction with different MoO3 thicknesses were prepared.The optimal thickness of MoO3 electrode layer was found to be 5 nm.The device's photoresponse in the near infrared region was used to fabricate OPDs with CuPc?CuPc?/C60?fullerene?/SnPc?tin phthalocyanine?/C60 structure.The photoluminescence In the green part of the poor light response,mainly due to the functional layer in the green band light absorption is poor;in order to improve the device's response to green light?532 nm?,the functional layer structure is prepared and characterized as CuPc/PTCDA?Perylene-3,4,9,10-tetracarboxylic dianhydride?/SnPc/C60 structure OPD found that the device's response to green light significantly increased.?3?Aiming at the problem of large dark current in OPDs devices,a new layer of[N'-diphenyl-N,N-bis?1-naphthylphenyl?-1,1-biphenyl-NPB]as hole-transporting layer and electron-blocking layer to reduce the dark current of the devices.OPDs with different NPB thicknesses were prepared and characterized.The optimal NPB thickness was 10 nm.In order to achieve low dark current we studied the OPDs with SnPc/PTCDA functional layers with different thickness ratio.We found that the OPDs with SnPc?30 nm?/PTCDA?20 nm?functional layer structure exhibited the highest responsivity in each band.Finally,a glass cover is used to encapsulate the device and observe its stability and attenuation. |
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