The defining feature of these materials is the presence of a . 2. Electronic Structure and Chemical Bonding
To understand the physics of organic semiconductors, one must look at the hybridization of carbon atoms. Hybridization ( sp2sp squared In a conjugated organic molecule, carbon atoms undergo sp2sp squared hybridization. Each carbon atom forms three localized
: When light is absorbed, it creates a bound electron-hole pair called an
-system are free to move across the conjugated segment, forming the basis for electrical conductivity. HOMO and LUMO Energy Levels
For deeper academic study, we recommend exploring these foundational texts often found in scientific databases (such as IEEE Xplore, APS journals, or institutional repositories): physics of organic semiconductors pdf
This comprehensive guide explores the fundamental physics governing organic semiconductors, detailing their electronic structures, charge transport models, and role in modern device applications.
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) in organic semiconductors . This is the exact opposite of inorganic semiconductors, where mobility decreases at higher temperatures due to lattice scattering.
Because the binding energy is significantly higher than thermal energy at room temperature ( The defining feature of these materials is the presence of a
The exciton diffuses to the donor-acceptor interface.
: While silicon is doped with impurities like Phosphorus, organic semiconductors are often "electrochemically" or "molecularly" doped to increase the density of charge carriers. Energy Levels
) at higher voltages is governed by the space charge that accumulates near the injecting electrode. In a trap-free material, this is described by the Mott-Gurney Law:
: Instead of continuous bands, they are defined by the HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular Orbital). The energy gap typically ranges from Hybridization ( sp2sp squared In a conjugated organic
One of the most critical differences in the physics of organic semiconductors is how they interact with light.
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) of the organic semiconductor, typically ranging from 1.5 eV to 3.0 eV. This places their optical transitions directly in the visible and near-infrared spectrum. 2. Charge Carrier Generation and Transport