In organics, these excitons are usually "Frenkel-type," meaning they are localized on a single molecule.
They can degrade when exposed to oxygen and moisture.
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. physics of organic semiconductors pdf
Charge carrier mobility is still significantly lower than in monocrystalline silicon.
In the world of materials science, the term "semiconductor" usually brings to mind rigid silicon wafers and inorganic crystals. However, a revolutionary class of materials——has redefined what electronics can look like. By combining the electrical properties of semiconductors with the mechanical flexibility of plastics, these materials have paved the way for OLED screens, flexible solar cells, and wearable sensors. Instead, it creates an —a bound electron-hole pair
If you are looking to download a , focus your study on the following core concepts: Conjugation and π-stacking. Miller-Abrahams hopping rates. Exciton diffusion lengths. The Marcus Theory of electron transfer.
The Physics of Organic Semiconductors: A Deep Dive into Plastic Electronics such as and roll-to-roll processing .
Instead of Valence and Conduction bands, we speak of HOMO (Highest Occupied Molecular Orbital) and LUMO (Lowest Unoccupied Molecular Orbital). The energy gap between these two determines the material's optical and electrical properties.
The unique physics of these materials allows for manufacturing techniques that are impossible with silicon, such as and roll-to-roll processing .