Heat annealing makes semiconductors more sensitive to pressure, for stronger cell phone signals, more accurate sensors and cleaner energy

https://www.eurekalert.org/news-releases/1084057

" simple added fabrication step enables semiconductors to convert mechanical stress to electricity (piezoelectricity)... in cell phones filters incoming signal reducing noise, in cars deploys airbag/ monitors tire pressure, in microelectronics/ photonics enhanced scandium aluminum nitride film's piezoelectric response... heating film to 700°C for 2 hours improved piezoelectricity 8X... heating boosts material's properties, correcting defects in tiny crystals' thin layers... aerospace, health care, energy"