Interesting article This article states that 50% of the world supply of solar grade Polysilicon is produced in the Xinjiang province of China, using Uyghur forced labor. China's genocide of the Uyghur people is coming under more and more global scrutiny and pressure from governments to enforce sanctions.
https://www.solarpowerworldonline.com/2021/02/how-a-forced-labor-prevention-act-may-affect-u-s-solar-panel-imports/