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An organic photodetector with high external quantum efficiency and wide spectral response and its preparation method

A technology of external quantum efficiency and photodetectors, applied in photovoltaic power generation, electric solid-state devices, semiconductor/solid-state device manufacturing, etc., can solve difficult problems such as wide response spectrum of devices, low external quantum efficiency, and reduced external quantum efficiency. Achieve the effects of improving external quantum efficiency, improving spectral response range, and high photoelectric multiplication effect

Active Publication Date: 2017-08-04
中科应化(长春)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2007, Perzon et al. synthesized the polymer LBPP-1. Due to its good absorption in the near-infrared region and good photoelectric properties, the spectral response range of the device can reach 1200nm, but the external quantum efficiency of the device is low. Its maximum external quantum efficiency is only 10%
In 2011, Binda et al. used a spin-coatable polymer as a barrier layer to prevent electrons from being injected from the anode into the organic layer, and successfully reduced the dark state current density of the device to the original while maintaining a slight decrease in the external quantum efficiency. One-thirtieth (2nA cm -2 ), but the EQE of the device at 750nm is only about 20%
However, since the defects at the interface are produced by ZnO nanoparticles, and ZnO is a wide-bandgap semiconductor, it only absorbs ultraviolet light, and the light absorption of the device in the visible and infrared regions can only be completed by another semiconductor, so it is very difficult It is difficult to make the response spectrum of this device very wide

Method used

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  • An organic photodetector with high external quantum efficiency and wide spectral response and its preparation method
  • An organic photodetector with high external quantum efficiency and wide spectral response and its preparation method
  • An organic photodetector with high external quantum efficiency and wide spectral response and its preparation method

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Effect test

Embodiment 1

[0066] First, the ITO anode 3 on the glass substrate 2 is photoetched into an electrode with a width of 4 mm and a length of 30 mm, then cleaned, blown dry with nitrogen, and the glass is placed in a vacuum oven and baked at 110 degrees Celsius for 30 minutes. After plasma treatment for 2 minutes, the glass was placed in a vacuum coating system. When the vacuum degree of the vacuum coating system reaches 1 to 5×10 -4 At the time of Pascal, a layer of 4P-NPB was evaporated on the side of the glass without ITO, and then the electron injection barrier layer 4 (TPBi), the electron transport layer 5 (C70), and the active layer 6 (SnPc) were evaporated on the ITO layer in sequence. and C70 mixed layer), hole injection blocking layer 7 (BCP) and cathode 8 (Al), wherein the two electrodes cross each other to form the effective photodetection area of ​​the device, and its effective area is 16 square millimeters, and the injection blocking layer 4 The thickness is 3 nanometers, the thi...

Embodiment 2

[0069] First, the ITO anode 3 on the glass substrate 2 is photoetched into an electrode with a width of 4 mm and a length of 30 mm, then cleaned, blown dry with nitrogen, and the glass is placed in a vacuum oven and baked at 110 degrees Celsius for 30 minutes. After plasma treatment for 2 minutes, the glass was placed in a vacuum coating system. When the vacuum degree of the vacuum coating system reaches 1 to 5×10 -4 At the time of Pascal, a layer of 4P-NPB was evaporated on the side of the glass without ITO, and then the electron injection barrier layer 4 (TPBi), the electron transport layer 5 (C70), and the active layer 6 (SnPc) were evaporated on the ITO layer in sequence. and C70 mixed layer), hole injection blocking layer 7 (BCP) and cathode 8 (Al), wherein the two electrodes cross each other to form the effective photodetection area of ​​the device, and its effective area is 16 square millimeters, and the injection blocking layer 4 The thickness is 3 nanometers, the thi...

Embodiment 3

[0072] First, the ITO anode 3 on the glass substrate 2 is photoetched into an electrode with a width of 4 mm and a length of 30 mm, then cleaned, blown dry with nitrogen, and the glass is placed in a vacuum oven and baked at 110 degrees Celsius for 30 minutes. After plasma treatment for 2 minutes, the glass was placed in a vacuum coating system. When the vacuum degree of the vacuum coating system reaches 1 to 5×10 -4 At the time of Pascal, a layer of 4P-NPB was evaporated on the side of the glass without ITO, and then the electron injection barrier layer 4 (TPBi), the electron transport layer 5 (C70), and the active layer 6 (SnPc) were evaporated on the ITO layer in sequence. and C70 mixed layer), hole injection blocking layer 7 (BCP) and cathode 8 (Al), wherein the two electrodes cross each other to form the effective photodetection area of ​​the device, and its effective area is 16 square millimeters, and the injection blocking layer 4 The thickness is 3 nanometers, the thi...

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Abstract

The invention relates to an organic photodetector with high external quantum efficiency and wide spectral response, comprising sequentially connected: a lower conversion layer, a substrate, an anode, an electron injection blocking layer, an electron transport layer, an active layer and a cathode; wherein The electron injection blocking layer has a thickness of 1 nanometer to 10 nanometers; the electron transport layer has a thickness of 5 nanometers to 60 nanometers; the active layer has a thickness of 5 nanometers to 200 nanometers; and the cathode has a thickness of 50 nanometers to 1000 nanometers. The present invention utilizes the hole-enhanced electron tunneling injection at the electrode after exciton separation to achieve a higher photomultiplication effect (EQE>15000%), and this structure is also very beneficial to the realization of an organic photodetector device with a wide spectral response .

Description

technical field [0001] The invention relates to an organic photodetector, in particular to an organic photodetector with high external quantum efficiency and wide spectral response and a preparation method thereof. Background technique [0002] Organic photodetectors will find wide applications in consumer electronics, household appliances, smart building lighting, industry, production safety, health care and life sciences, environment, toys, and education due to their many advantages such as flexibility, cheapness, and ease of integration. Applications. To meet the requirements of practical applications, organic photodetectors should have high external quantum efficiency and wide spectral response range. At present, the spectral response range of organic photodetector devices is relatively narrow. In the ultraviolet band, due to the absorption of ultraviolet light by glass and ITO, the response of the device in the deep ultraviolet region is relatively small; in the near-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/42H01L51/44H01L51/46H01L51/48
CPCH10K85/211H10K30/87H10K30/00Y02E10/549Y02P70/50
Inventor 马东阁杨德志
Owner 中科应化(长春)科技有限公司
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