When an organic semiconductor absorbs a photon, it doesn't immediately create a free electron and hole. Instead, it creates an —a bound electron-hole pair held together by strong electrostatic (Coulombic) attraction.
In amorphous or highly disordered polymer films, energy states are localized on individual molecular segments. Charges move via , commonly modeled as hopping . The charge mobility ( ) in these systems is highly dependent on temperature ( ) and electric field (
(sigma) bonds with its neighbors in a planar geometry. These physics of organic semiconductors pdf
Because organic molecular solids are held together by weak Van der Waals forces, the electronic coupling between neighboring molecules is small. This causes charge transport to be highly localized and temperature-dependent. Hopping Conduction
In molecular physics, the overlapping atomic orbitals form Molecular Orbitals (MOs): When an organic semiconductor absorbs a photon, it
Note: For a more detailed academic overview, including equations on charge transport (Marcus theory) and device efficiency, specialized textbooks or authorized PDF review articles such as "Physics of Organic Semiconductors" by W. Brütting are recommended.
If you are preparing a document or academic report based on this topic, you can download or print this comprehensive breakdown. To find specific downloadable research papers, textbooks, or lab manuals in PDF format, search academic repositories for titles focusing on "Electronic Processes in Organic Crystals and Polymers" or "Introduction to Molecular Electronics." Charges move via , commonly modeled as hopping
To understand organic semiconductors (OSCs), one must first understand how they differ from the "standard" inorganic semiconductors (like Silicon).
). In organic semiconductors, this gap typically ranges from 1.5 eV to 3.0 eV, placing their optical transitions firmly in the visible and near-infrared spectrum. Disordered Energetic Landscapes
Organic semiconductors have revolutionized the fields of electronics and optoelectronics, bridging the gap between plastic materials and carbon-based electronics. Unlike traditional inorganic semiconductors such as silicon or gallium arsenide, organic semiconductors rely on carbon-based molecules and polymers to transport charge and interact with light. This article provides a comprehensive overview of the fundamental physics governing these materials, their charge transport mechanisms, optoelectronic properties, and key applications. 1. Introduction to Organic Semiconductors