Developed a method to fabricate spatially resolved multi-color CsPbX3 (X = Cl, Br, I) semiconductor nanowire heterojunctions with high resolution.
Significance and Impact
This approach offers new opportunities in fundamental understanding of the anion exchange / transport in halide perovskites as well as applications in multi color LEDs and Lasers.
- Semiconductor heterojunction is a key building block in modern electronics and optoelectronics.
- Combined anion exchange chemistry and electron-beam lithography to fabricate halide perovskite nanowire heterojunctions with spatial resolution greater than a few hundred nanometers.
- Confocal photoluminescence (PL) mapping shows different PL at different sections, and Kelvin probe force microscopy (KPFM) shows distinct electronic states across the interface of the heterojunctions.