Fig. 8: Material identification using the on-chip OECS.

a Schematic illustration of the transmission-mode measurement setup. b Photographs of the OECS chip and a chip in a metal-encapsulated module. c Four organic semiconductor material solutions. d Reconstructed absorption spectra obtained with the OECS, compared with reference spectra measured by a commercial spectrometer. e Classification results based on the reconstructed spectra, represented as spectral response weight vectors for each sample.