To generate electricity in a solar cell, this exciton must be "broken" at an interface (the Donor-Acceptor interface) to create free charges. 4. Key Applications in Modern Tech
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 physics of organic semiconductors pdf
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. To generate electricity in a solar cell, this
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 . In these molecules, carbon atoms form alternating single
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.
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.