Researchers have developed a method to map the lateral distribution of electrical defects in coplanar bottom-gate indium-gallium-zinc oxide (IGZO) thin-film transistors (TFTs). This advancement is crucial for understanding and improving the reliability and performance of these devices, which are fundamental in high-resolution displays and flexible electronics. The technique relies on low-frequency noise analysis, providing a non-destructive tool for characterizing defect heterogeneity along the transistor channel.

The proposed method allows for the determination of how defect concentrations vary along the device channel. IGZO TFTs are known for their high electron mobility and low leakage current, but the presence of defects at the semiconductor-dielectric interface or within the semiconductor bulk can significantly degrade their properties. Traditionally, the characterization of these defects has been performed using techniques that offer a global or averaged view, without resolving their spatial distribution.

The ability to laterally locate and quantify these defects is vital for optimizing manufacturing processes and device design. Understanding this distribution can lead to more effective strategies for defect passivation and improved device uniformity, which in turn will impact the production of more efficient and durable displays, as well as the development of the next generation of solid-state electronics.