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Photothermal induced resonance (PTIR) spectra identify contaminants in van der Waals heterostructures (vdWHs) prepared using the water-assisted PDMS pick-up and transfer method. Representative topographic images (left) and PTIR absorption spectra (right) obtained at the marked locations on vdWHs fabricated by overlaying flakes of (a) hBN/hBN, (b) WSe2/hBN, (c) WS2/hBN, and (d) WSe2/WS2. Scale bars represent 2 μm.
