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Organic vertical diode integrated with transient light detection and light synapse functions and application thereof

A vertical diode and light detection technology, applied in the field of photoelectric sensing, to achieve the effect of long memory time, large linear dynamic range, and high detection rate

Pending Publication Date: 2022-02-18
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, despite great progress in optoelectronic synapses, few vertical diode-type organic optoelectronic synapses have been reported so far.

Method used

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  • Organic vertical diode integrated with transient light detection and light synapse functions and application thereof
  • Organic vertical diode integrated with transient light detection and light synapse functions and application thereof
  • Organic vertical diode integrated with transient light detection and light synapse functions and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 1 As shown, a multifunctional organic vertical diode, its device structure includes a substrate 1 , an anode 2 , a hole transport layer 3 , an active layer 4 , an electron transport layer 5 and a cathode 6 .

[0052] The substrate 1 is glass, the anode 2 is ITO, and the hole transport layer is an organic P-type polymer material (such as poly(4-butyltriphenylamine) (poly-TPD), 3,4-ethylenedioxythiophene mixed polystyrene sulfonate (PEDOT:PSS) etc.). The active layer 4 is a thin film of a blend system of organic p-type material P3HT and organic n-type material PCBM (the ratio of donor and acceptor is 1:1), or a co-film of organic p-type material PTB7-Th and organic n-type material IEICO-4F. Mixed system (donor-acceptor ratio is 1:1.2) thin film, and other possible organic blend heterojunction structures, the film thickness is 300 nanometers, and the electron transport layer 5 is 3,3'-(1,3, 8,10-tetraanthrone[2,1,9-def:6,5,10-d'e'f']diisoquinoline-2,9(1H,3...

Embodiment 2

[0060] Heart Rate Monitoring Tests of Multifunctional Organic Vertical Diodes Used as Photodetectors Under Negative Bias:

[0061] Such as image 3 As shown, when the multifunctional organic vertical diode works in negative bias, the ITO is connected to the negative and the metal cathode is connected to the positive. attached Figure 4 The normalized detectivity curves of multifunctional organic vertical diodes used as photodetectors under negative bias voltage are given. It can be seen from the figure that the peak detection rate of the device at high frequency (1KHz) can reach 4.58×10 12 jones. The results obtained when the prepared multifunctional organic vertical diode was used in the transmissive PPG test under negative bias were as follows: Figure 5 , the tester's heart rate was 84 beats per minute under normal conditions, and 108 beats per minute after exercise.

Embodiment 3

[0063] When the multifunctional organic vertical diode is used as a photosynapse under negative bias, it simulates the test of associative learning behavior and image recognition:

[0064] Such as Figure 6 As shown, when the multifunctional organic vertical diode works in negative bias, the ITO is connected to the positive and the metal cathode is connected to the negative. attached Figure 7 The paired pulse facilitation behavior (PPF) of the device under forward bias is given. Under two consecutive light stimulations, the photocurrent of the device is significantly greater than that of the previous one, which is similar to the process of organisms responding to external stimuli. (Second stimuli tended to elicit stronger responses). attached Figure 8 A device is given to simulate the associative learning behavior of looking for plums to quench thirst. For a person who has never tasted plums, other people’s descriptions of plums are regarded as neutral stimuli. Makes a p...

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Abstract

The invention relates to a multifunctional organic vertical diode integrating transient light detection and photosynapse functions and application thereof. The multifunctional organic vertical diode structurally comprises a substrate, an anode layer, a hole transport layer, an active layer, an electron transport layer and a metal cathode in sequence, the substrate is coated with the anode layer, then the hole transport layer, the active layer, the electron transport layer and the metal cathode are sequentially evaporated or spin-coated, and the multifunctional organic vertical diode is obtained. The device is used as a photosynapse under positive bias voltage, shows long memory time, and realizes fantasy association learning and high image recognition precision. According to the organic vertical diode, the multifunctional organic vertical diode integrating transient optical detection and optical synapse functions is realized for the first time, meanwhile, vertical optical synapses at the two ends are realized for the first time, effective space and weight saving are provided for space-limited applications (including wearable equipment, smart phones and other portable consumer electronics), and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of photoelectric sensing, in particular to an organic vertical diode integrating transient light detection and optical synapse functions, a preparation method thereof, and an application in non-contact heart rate detection and image recognition. Background technique [0002] Organic materials, an important component of solution-processed semiconductors, have attracted intense research interest due to their wide variety of sources, optoelectronic properties that can be tuned by molecular design, biocompatibility, light weight, and flexibility. In the past few decades, organic materials have made great progress in solar cells, photodetectors, light-emitting diodes, field-effect transistors, and memristors. Recently, attention has been paid to multifunctional organic devices. The combination of photovoltaic and light-emitting functions in organic photodiodes is of great significance in flexible and wearable electronics....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/42H01L51/48
CPCH10K71/12H10K30/20Y02E10/549
Inventor 黄辉刘天华
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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