A kind of Cu-doped SNSE semiconductor thin film and electrochemical preparation method thereof

Abstract

The invention relates to a Cu-doped SnSe semiconductor film and an electrochemical preparation method thereof. Copper chloride, stannous chloride and sodium selenite are selected as copper, tin and selenium sources, ethylenediamine tetraacetic acid disodium salt serves as a complexing agent, and urea and sodium dodecyl sulfate serve as an additive to prepare electrolyte; after a pH value of a plating solution is adjusted to be 1.5-5, electro-deposition is performed at a room temperature to obtain a Cu-doped SnSe pre-deposited film; and then the SnSe pre-deposited film is subjected to annealing so that the Cu-doped SnSe semiconductor film can be obtained. Due to the method, the Cu-doped SnSe semiconductor film free of an impurity phase can be prepared, the carrier concentration, the migration rate and the conductivity of the film are high, and the thermoelectric performance of the Cu-doped SnSe semiconductor film can be improved easily. Due to the preparation method, chemical components and the electric transmission performance of the Cu-doped SnSe semiconductor film can be controlled through electrolyte components, a deposition process and an annealing method, the beneficial effects that controllability is high and repeatability is good are achieved, and the preparation method is applicable to large-area preparation.

Description

technical field [0001] The invention belongs to the field of thermoelectric materials, in particular to a Cu-doped SnSe semiconductor thin film and an electrochemical preparation method thereof. Background technique [0002] Thermoelectric materials can directly convert thermal energy into electrical energy, and have a wide range of research and applications in the fields of waste heat utilization, power generation devices, and temperature measurement. The early thermoelectric materials are mainly metal materials, but the limitations of metal materials are very obvious. Their Seebeck coefficients are low, but their thermal conductivity is often high, which also leads to their low thermoelectric figure of merit, which is difficult to meet the industrial requirements for thermoelectricity. material requirements. In the late 1950s, Abram Ioffe discovered that semiconductor materials have significantly superior thermoelectric conversion effects compared to metal materials, so m...

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Problems solved by technology

Therefore, whether it is single crystal or polycrystalline SnSe as a thermoelectric material, the industrial application is limited.

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