Physics Of Organic Semiconductors Pdf Official

The Physics of Organic Semiconductors: A Review

4. Optical Properties and Transitions

Organic semiconductors have distinct optical signatures due to the coupling of electrons and vibrations.

Introduction

B. The Exciton

When an electron is excited to the LUMO, it remains bound to the hole left in the HOMO due to Coulombic attraction.

Keyword density

: Rather than moving as free electrons, charges in organic materials typically move as

When an organic semiconductor absorbs a photon, it doesn't immediately create a free electron and hole. Instead, it creates an exciton—a bound electron-hole pair held together by strong electrostatic (Coulombic) attraction. physics of organic semiconductors pdf

Band Transport: Observed primarily in high-purity single crystals at low temperatures where intermolecular coupling is strong.

HOMO and LUMO: In place of the valence and conduction bands found in inorganic crystals, organic semiconductors utilize molecular orbitals: The Physics of Organic Semiconductors: A Review 4