Self-driven short-wave infrared response organic photoelectric synapse flexible device and application thereof

A short-wave infrared and flexible device technology, applied in the direction of electric solid-state devices, photovoltaic power generation, electrical components, etc., can solve problems affecting device performance and achieve high relative permittivity, strong absorbance, and good solubility

Pending Publication Date: 2021-10-22
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neuronal synapse behavior of the human body is tens to hundreds of femtojoules, and most of the current photoelectric synapse devices are three-terminal phototransistor structures, which often need to serve at a higher driving voltage. Such a large energy consu

Method used

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  • Self-driven short-wave infrared response organic photoelectric synapse flexible device and application thereof
  • Self-driven short-wave infrared response organic photoelectric synapse flexible device and application thereof
  • Self-driven short-wave infrared response organic photoelectric synapse flexible device and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a conjugated polymer based on benzobisthienediazole and tellurphene, the structural formula of which is shown in formula (I);

[0027]

[0028] In the general structural formula of formula I, n is an integer greater than or equal to 4 and less than 20. And the polymer in formula I is denoted as PBTT. exist figure 1 The UV-visible-infrared absorption spectrum of the polymer is shown in , it can be seen from the spectral absorption that the polymer has a wide absorption in the visible and most short-wave infrared regions, and is a good short-wave infrared material, so it can be used to prepare organic Short-wave infrared optoelectronic synapse. figure 2 It is the frequency-permittivity curve fitted by the device with the structure of ITO / PEDOT:PSS / PBTT / Al. It can be obtained that the relative permittivity of the polymer is 5.8, which is a relatively high value among organic polymers. And polymers such as PBBT-2OT The dielectric constant i...

Embodiment 3

[0030] This example provides a method for preparing the polymer PBTT represented by the above formula (II).

[0031] (1) Protected by inert gas, under the catalysis of tris(dibenzylideneacetone) dipalladium and tris(o-methylphenyl)phosphorus, 4,8-Bis[5-bromo-4-(2-octyldodecyl )-2-thienyl]-2λ4δ2-benzo[1,2-c:4,5-c']-bis[1,2,5]thiadiazole(M1) and 2,5-bis(trimethylstannyl)tellurophene(M2) A mixed solution is obtained in an organic solvent.

[0032] In this method, 4,8-Bis[5-bromo-4-(2-octyldodecyl)-2-thienyl]-2λ4δ2-benzo[1,2-c:4,5-c']-bis[1,2 ,5] The molar ratio of thiadiazole to 2,5-bis(trimethylstannyl)tellurophene is 1:0.99-1.05, preferably 1:1. The amount of tris(dibenzylideneacetone)dipalladium is 4,8-Bis[5-bromo-4-(2-octyldodecyl)-2-thienyl]-2λ4δ2-benzo[1,2-c:4,5- 2-4% of c']-bis[1,2,5]thiadiazole molar dosage, the dosage of tris(o-methylphenyl)phosphorus is 4,8-Bis[5-bromo-4-(2-octyldodecyl) -2-thienyl]- 2λ4δ2-benzo[1,2-c:4,5-c']-bis[1,2,5]thiadiazole 8%-12% of molar do...

Embodiment 4

[0045] In this embodiment, the method of using narrow bandgap copolymers for preparing photoelectric synapse devices includes:

[0046] Weigh 10mg of the polymer obtained in Example 3, dissolve it in 0.25mL ultra-dry o-dichlorobenzene, heat and stir at 60°C for 2h until it is completely dissolved, and prepare the polymer on a PET substrate coated with gold electrodes by spin coating or other methods A photoactive layer film with uniform thickness; in a specific embodiment, the thickness of the active layer is 80nm. Finally prepared as Figure 5 The device structure shown. The device includes: flexible substrate (PET) / electrode (Au) / photoactive layer (narrow bandgap conjugated polymer).

[0047] Image 6 Current-time curves at different wavelengths for the use of conjugated polymers in photoelectric synapses with a bias voltage of 0V. It can be seen that the dark current is stable when no light is added, and under the same light intensity (100mW / cm 2 ), under the irradiati...

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Abstract

The invention discloses a narrow-band gap conjugated polymer based on benzobithiophene diazole and tellurophene and application of the narrow-band gap conjugated polymer in a self-driven short-wave infrared response organic photoelectric synapse flexible device. The narrow-band-gap polymer is good in solubility, the spectral absorption range covers a visible light area, a near-infrared band and a part of short-wave infrared bands, close packing of molecules is promoted through tellurium-tellurium interaction between polymer chains, and therefore the narrow-band-gap polymer has a high dielectric constant and is beneficial to photogenerated exciton dissociation. And meanwhile, due to the extremely unbalanced hole and electron transmission capability of the polymer, electrons which are relatively slowly transmitted become trap centers, so that holes of an external circuit continuously tunnel and are injected into a device, and a photoconductive effect is generated. The short-wave infrared response organic photoelectric synapse two-end flexible device prepared on the basis of the mechanism can work without external bias voltage, simulates multiple nerve synapse behaviors, and achieves a good effect.

Description

technical field [0001] The invention relates to the field of organic photoelectric synaptic devices, in particular to a self-driven short-wave infrared response organic photoelectric synaptic flexible device. Background technique [0002] Traditional von Neumann computing systems will face a series of problems due to the physical separation of memory modules and processors, such as additional energy consumption during data transfer, limited computing speed, and unstructured real-time information processing. Neuromorphic computing is considered to be one of the most promising methods to solve the von Neumann bottleneck due to its advantages of adaptive learning, high parallel computing and low power consumption. An important prerequisite for the realization of neuromorphic computing is to develop neurosynaptic devices that can simulate the behavior of biological synapses. Electrical neurosynaptic devices are the first developed neurosynaptic devices, but their overall optimi...

Claims

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Application Information

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IPC IPC(8): H01L51/46H01L51/42
CPCH10K85/1135H10K30/20Y02E10/549
Inventor 黄辉陈皓
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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