Physics Of Organic Semiconductors Pdf (Pro · 2027)

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A bound electron-hole pair is known as an exciton .

. Charges (electrons or holes) "hop" between localized molecular states, often assisted by thermal energy. physics of organic semiconductors pdf

) dipole-dipole coupling mechanism, dominant for singlet excitons. A short-range (

), Frenkel excitons do not spontaneously dissociate into free charges. Spin States: Singlets and Triplets This public link is valid for 7 days

The energy difference between the HOMO and LUMO is the fundamental electronic bandgap ( Egcap E sub g

Understanding how disorder affects charge mobility. Conclusion Can’t copy the link right now

Organic semiconductors represent a fascinating class of electronic materials that deviate significantly from traditional inorganic semiconductors like silicon. The fundamental distinction lies in how electrical conductivity arises. In inorganic materials, conductivity results from the periodic crystal lattice that allows charge carriers to move freely, much like a well-organized highway system.

Inorganic (Wannier-Mott) Organic (Frenkel) Low binding energy High binding energy Large radius Localized to one molecule [ Hole ] . . . . . [ Electron ] [ Hole / Electron ] Frenkel Excitons

Perhaps the most significant difference is the fate of absorbed light. In silicon, light generates free electron-hole pairs. In organics, because of the low dielectric constant (ε ≈ 3-4) and strong Coulomb interaction, the electron and hole bind to form a Frenkel exciton with a binding energy of 0.1–1.0 eV. These excitons diffuse via Förster or Dexter energy transfer, not via drift.