A single-molecule junction thermoelectric potential measurement method and equipment based on stm-bj

A technology of STM-BJ and measurement method, applied in the direction of measuring device, measuring electric variable, measuring current/voltage, etc., can solve the problems of complex method and low success rate, achieve high fault tolerance rate, convenient calculation, and wide adjustable range Effect

Active Publication Date: 2021-03-19
XIAMEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above two methods must use micromachining to process the chip or needle tip used, and introduce a platinum resistance heater to control its temperature. The method is complicated and the success rate is extremely low.

Method used

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  • A single-molecule junction thermoelectric potential measurement method and equipment based on stm-bj
  • A single-molecule junction thermoelectric potential measurement method and equipment based on stm-bj
  • A single-molecule junction thermoelectric potential measurement method and equipment based on stm-bj

Examples

Experimental program
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Effect test

Embodiment 2

[0069] Applying this method to the measurement of the thermoelectric potential of diketopyrrolopyrrole molecules,

[0070] Based on the scanning tunneling fissure device, the scanning tunneling fissure device includes: a substrate temperature control module, a substrate, and a probe, including the following steps:

[0071] S0. Heat the substrate to the target temperature through the substrate temperature control module and keep the target temperature constant. The temperature is set at 25°C. This temperature is the laboratory maintenance temperature of our research group, that is, the set temperature is the same as the room temperature;

[0072] S1. Through STM-BJ technology, the needle tip of the probe repeatedly pulls a molecule and then breaks it, and then repeats this process repeatedly, records the conductance data of the process, and constructs a single-molecule junction between the probe and the substrate. A first bias voltage of 0.1V is applied between the probe and th...

Embodiment 3

[0080] Apply this method to measure G 1 Molecular thermoelectric potential,

[0081] Based on the scanning tunneling fissure device, the scanning tunneling fissure device includes: a substrate temperature control module, a substrate, and a probe, including the following steps:

[0082] S0. Heat the substrate to the target temperature through the substrate temperature control module and keep the target temperature constant. The temperature is set at 25°C;

[0083] S1. Through STM-BJ technology, the needle tip of the probe repeatedly pulls a molecule and then breaks it, and then repeats this process repeatedly, and records the conductance data of the process. Refer to figure 1 , construct a monomolecular junction between the probe and the substrate, apply a first bias voltage of 0.1V between the probe and the substrate, and measure the first current between the probe and the substrate by the current measurement loop value, calculate the first conductance value of a single mole...

Embodiment 4

[0091] Further provide a single-molecule junction thermoelectric potential measurement device based on STM-BJ, based on a scanning tunneling split junction device, the scanning tunneling split junction device includes: a substrate temperature control module, a substrate, a probe, the probe and A relay is arranged between the bases, a current measurement circuit and a voltage amplifier circuit are connected between the probe and the base through a relay, and the relay is used to switch the current between the probe and the base measurement loop or the voltage amplifier loop.

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Abstract

The invention discloses an STM-BJ-based monomolecular junction thermoelectric potential measurement method and STM-BJ-based monomolecular junction thermoelectric potential measurement equipment. A Seebeck coefficient of a molecular junction is obtained by acquiring a single molecule, verifying the single molecule, measuring a thermal voltage, verifying the single molecule, repeatedly acquiring a plurality of pieces of data, and then carrying out corresponding statistics and calculation. A stable and easily-adjusted heat source is provided for a substrate based on an STM-BJ technology, so thatthe temperature difference is constructed at the two ends of the molecular junction, an independent voltage amplifier is introduced to measure the electromotive force generated by the temperature difference after the molecular junction is formed, and therefore measurement of the thermoelectric potential of the monomolecular junction is achieved. Compared with an MCBJ technology and an STM-BJ needle tip temperature control technology, the research means has the advantages of being simple, efficient, wide in adjustable range, high in error-tolerant rate and the like, the measurement efficiency of the monomolecular junction thermoelectric potential is greatly improved, research and development of a novel organic thermoelectric material are promoted, and powerful assistance is provided for thesociety where the energy urgently needs to be changed.

Description

technical field [0001] The invention relates to the field of unimolecular thermoelectric potential measurement, in particular to a method for measuring unimolecular junction thermoelectric potential based on STM-BJ. Background technique [0002] The first thermoelectric effect refers to the thermoelectric phenomenon in which the voltage difference between two substances is caused by the temperature difference between two different electrical conductors or semiconductors. When two different conductors contact each other to form a closed circuit, if the temperature of the two contact points is different, a current will appear in the circuit, and the electromotive force of the generated current is the thermoelectric potential. Most metal and semiconductor materials have different degrees of thermoelectric performance, but there are very few materials with high thermoelectric conversion efficiency. [0003] With the development of single-molecule electrical measurement technolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20G01R19/00
CPCG01N25/20G01R19/0084
Inventor 洪文晶李国鹏陈杭
Owner XIAMEN UNIV
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