extrinsic defect

synonym: extrinsic surface defect
https://doi.org/10.1351/goldbook.14011
Imperfection in a solid semiconductor (or insulator) connected with surface defects of any sort involving extrinsic chemical units in relation to the chemical formula of the solid, particularly adsorbed species of any sort.
Notes:
  1. These extrinsic surface defects play an essential role in heterogeneous photocatalysis. For example, they can serve as photocatalytic centres (sites). Surface defects, as well as bulk defects located in the near-surface region, can serve as entities that absorb ultraviolet, visible, or infrared radiation and generate free charge carriers. Surface defects can trap charge carriers and serve as recombination centres, thereby influencing the concentration of photocarriers at the surface of photocatalyst particles.
  2. Doping of a catalyst creates an extrinsic defect.
Source:
PAC, 2011, 83, 931. (Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)) on page 952 [Terms] [Paper]
Citation: 'extrinsic defect' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.14011 RIS BibTex EndNote
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