Because organic films are often amorphous or polycrystalline, charges don't flow smoothly. Instead, they "hop" from one localized molecular site to another. This process is thermally activated; as temperature rises, conductivity typically increases—the opposite of most metals.
In organics, these excitons are usually "Frenkel-type," meaning they are localized on a single molecule. physics of organic semiconductors pdf
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. For those searching for a comprehensive or study
For those searching for a comprehensive or study guide, understanding the fundamental shift from band theory to hopping transport is essential. 1. What Makes Organic Semiconductors Unique? these excitons are usually "Frenkel-type
One of the most critical differences in the physics of organic semiconductors is how they interact with light.