A method and system for multi-zone control of temperature for a substrate is described. An embodiment of the portable substance identification system includes a portable substance identification device containing a Raman spectrometer, and a collection stem that includes a dry collector. The plurality of connecting portions pass through a first insulating layer at a plurality of jointing points which are selected among a plurality of overlapping points where the plurality of lead-out lines and the plurality of gate lines overlap in a plane area.