Studies Of Preparation And Electrical Properties Of CuAlO₂ Ceramics

Transparent conductive oxide?TCO?films have good electrical conductivity,high visible light transmittance and so on.It has been widely used in the field of solar cells,flat panel display and other optoelectronic devices.Transparent conductive oxide semiconductors can be classified into two types according to the type of conduction:N and P.The transparent conductive oxides currently used are generally n semiconductors,because the conductivity of N semiconductors is 3⁴ orders of magnitude higher than that of P semiconductors.Most of the ceramic targets needed for preparing CuAlO₂ thin films are obtained by high temperature solid-state method,and the sintering temperature is high for a long time.In this paper,aluminosilicate glass is used as a sintering agent to improve the sintering activity of CuAlO₂,reduce the sintering temperature and shorten the sintering time.The high density and high conductivity of CuAlO₂ ceramics are obtained.First,in order to obtain high conductivity CuAlO₂,the effect of different aluminosilicate glass content on the electrical properties of CuAlO₂ ceramics was investigated.It was found that the aluminosilicate glass added to CuAlO₂ not only promotes the growth of grains,but also promotes the development of grains.When the aluminosilicate glass content reaches 9.5%,the grain growth of CuAlO₂ ceramic is complete,the grain shape is polygonal,the maximum relative density is 90.4%,and its electrical conductivity is one order of magnitude higher than that of pure CuAlO₂ceramics.Adding proper amount of aluminosilicate glass can reduce the ignition voltage of the material,and with the increase of the amount of aluminosilicate glass,the ignition voltage first decreases and then increases.Second,CuAlO₂ ceramics doped with 9.5%aluminosilicate glass were synthesized by traditional solid-phase method.The influence of sintering process on the electrical conductivity of CuAlO₂ ceramics was studied.It is found that with the increase of sintering temperature,the density,grain size and electrical conductivity of CuAlO₂ ceramics gradually increased.When the sintering temperature is 1175?,the density and relative density of CuAlO₂ ceramics reach the maximum,which are 4.408g·cm^-33 and 95.8%,respectively.When the sintering temperature reached 1200?,the CuAlO₂ ceramics grain growth and development was complete,showing a polygonal structure,and its conductivity reached the maximum(2.42 S·m^-1),nearly 10 times higher than the sample sintered at 1050?.In addition,with the increase of sintering time,the density and conductivity of CuAlO₂ ceramics sintered at 1200?increase gradually,and with the increase of sintering time,the ignition voltage first decreases and then tends to be stable.