US thin-film solar module maker First Solar Inc (<a href="https://www.nasdaq.com/market-activity/stocks/fslr" target="_blank">NASDAQ:FSLR</a>) has initiated legal action against Chinese peer JinkoSolar Holding Co Ltd (<a href="https://www.nyse.com/quote/XNYS:JKS" target="_blank">NYSE:JKS</a>) over an alleged infringement of its TOPCon technology.