Extrinsic absorption

{
  "id": "MLC-T-CHM-004310",
  "term": "Extrinsic absorption",
  "field": "Chemistry",
  "definition": "Light absorption in a material that arises from impurities, defects, or dopants within its structure, rather than from the intrinsic electronic transitions of the pure material. This type of absorption often occurs at photon energies lower than the fundamental absorption edge. It is frequently exploited in semiconductor technology to tailor optical properties.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "fundamental absorption edge",
    "intrinsic defects"
  ],
  "references": [
    "PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 951 (https://doi.org/10.1351/PAC-REC-09-09-36)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/extrinsic-absorption/"
}