An employee tests a semiconductor wafer product in the &#39;clean room&#39; laboratory at the IQE Plc headquarters in Cardiff, U.K., on Thursday, Sept. 28, 2017. IQE makes wafers that are needed for Vertical Cavity Surface Emitting Lasers (VCSELs), used for 3D sensors and widely thought to be included in the new iPhone. Photographer: Luke MacGregor/Bloomberg via Getty Images