Physics Of Organic Semiconductors Pdf [work]
Long-chain macromolecules (e.g., P3HT, PTB7, PEDOT:PSS) that are inherently solution-processable, enabling low-cost, large-area printing technologies.
The electronic structure of organic semiconductors is characterized by a filled valence band and an empty conduction band, similar to inorganic semiconductors. However, the electronic states in organic semiconductors are often described using a molecular orbital (MO) approach, rather than the band structure approach used for inorganic semiconductors. In the MO approach, the electronic states are described in terms of the molecular orbitals of individual molecules or polymer chains.
At room temperature, the dominant mechanism for charge transport in most organic semiconductors is between localized states. Charges do not move as free waves; they "hop" from one molecule to another, overcoming energetic barriers imposed by the disordered DOS.
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In OSCs, the energy levels are defined by the (Highest Occupied Molecular Orbital) and LUMO (Lowest Occupied Molecular Orbital), equivalent to the valence and conduction bands in silicon.
Once generated, excitons move through the organic film during their brief lifetime (nanoseconds for singlets, microseconds for triplets). This migration occurs via two non-radiative energy transfer mechanisms: A long-range (
The exciton diffuses to the interface between the donor and acceptor. Long-chain macromolecules (e
orbital sits perpendicular to the molecular plane. When adjacent carbon atoms share these orbitals, they overlap laterally to form . HOMO and LUMO Levels The delocalization of
The offset between the LUMO levels provides the driving force to break the exciton binding energy; the electron hops to the acceptor, while the hole remains on the donor. Free carriers are collected at respective electrodes. Organic Field-Effect Transistors (OFETs)
The physics of HOMO-LUMO transitions, exciton diffusion, and polaron hopping directly governs how organic devices operate. Organic Light-Emitting Diodes (OLEDs) In the MO approach, the electronic states are
OSC physics is inextricably linked to morphology. Materials can range from amorphous (disordered) to crystalline.
The energy offset between the LUMO levels drives electron transfer from the donor to the acceptor, overcoming the exciton binding energy.
