Room temperature sensing of ozone by transparent p-type semiconductor CuAlO2

A transparent p-type semiconductor, CuAlO2, shows selective and reversible response to ozone gas at room temperature. All existing commercial semiconductor ozone sensors are of n type. This study demonstrates the feasibility of developing an inexpensive p type and transparent ozone sensor. Types of transparent p–n junction ozone sensors may be fabricated using the p-type semiconductor CuAlO2 and existing n-type transparent materials such as In2O3.