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Used in almost all high-end smartphones. When electrons and holes recombine in the organic layer, they release energy as light.
The "magic" happens because of . In these molecules, carbon atoms form alternating single and double bonds. This creates delocalized π-electrons that can move along the backbone of a polymer chain or between stacked small molecules, allowing for electrical conductivity. 2. Charge Transport: From Bands to Hopping
The unique physics of these materials allows for manufacturing techniques that are impossible with silicon, such as and roll-to-roll processing .
Charge carrier mobility is still significantly lower than in monocrystalline silicon.
One of the most critical differences in the physics of organic semiconductors is how they interact with light.
When a charge (electron or hole) moves through an organic molecule, it slightly deforms the molecular structure. This combination of a charge and its induced lattice distortion is called a polaron . 3. Optical Physics and Excitons
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.
Unlike inorganic semiconductors (silicon, germanium) which are held together by strong covalent bonds in a 3D lattice, organic semiconductors are composed of carbon-based molecules or polymers held together by weak .