Definition of the Subject
Organic photovoltaics (OPVs) are devices made of organic (carbon-based) semiconducting small molecules or polymers for converting incident sunlight into electrical power. They differ significantly from inorganic photovoltaic (PV) devices in the physical principles of their operation, as well as in their methods of production. OPVs are based on organic thin films of tens to a few hundreds of nanometers and can be fabricated using printing, vacuum evaporation, and roll-to-roll coating techniques, and thus offer the potential for ultra low-cost mass-producible photovoltaic devices. This is in contrast with the costly and energy-intensive fabrication of traditional crystalline silicon-based photovoltaics. OPV can be easily integrated into consumer electronics devices, even textiles and other mechanically flexible structural elements due to their production methods. An...
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Abbreviations
- Bulk heterojunction:
-
A mixture of interpenetrating electron-donor and electron-acceptor conjugated molecules that allows absorption of light, generation of excitons, splitting of excitons at the donor-acceptor interface, and efficient transport of positive and negative charges to opposite electrodes.
- Conjugated molecule:
-
An organic (carbon-based) molecule with delocalized electrons moving through π bonding orbitals. Conjugated molecules strongly absorb certain wavelengths of light due to excitation of π electrons from bonding π-orbitals to higher energy orbitals. As a result of delocalization of electrons, conjugated molecules also conduct charge. All organic semiconductors belong to this family of compounds.
- Electron acceptor:
-
A molecule that can accept electrons, thereby becoming reduced. The measure of electron acceptor strength is electron affinity, which also corresponds to work function in metals and semiconductors.
- Electron donor:
-
A molecule that donates electrons to another compound, thereby becoming oxidized. Following excitation with light, excited electrons can be donated to an acceptor molecule with a lower electron energy level. How easily a molecule gives up an electron depends on its ionization potential.
- Exciton:
-
A quasiparticle that forms in insulators and semiconductors following absorption of a photon. Consisting of a Coulombically bound electron and positive hole pair, it can be split due to interaction with a neighboring electron-accepting conjugated molecule into free positive and negative charges. Its binding energy depends on the dielectric constant of the material in which it forms.
- P3HT poly(3-hexyl thiophene):
-
A polythiophene with a pendant 6-carbon side-chain which provides high solubility in organic solvents. P3HT is a good electron donor material that effectively transports positive holes. When blended together with PCBM, 5% efficiency solution-processed solar cells can be achieved.
- PCBM ([6,6]-phenyl C61-butyric acid methyl ester):
-
A soluble derivative of buckminsterfullerene (C60) that is one of the most successful electron acceptor materials used in solution-processed organic solar cells. It effectively transports electrons from molecule to molecule as well.
- Phthalocyanines:
-
A family of macrocyclic pigments with strong absorption in the red part of the visible spectrum, good electron-donor properties, high stability, and effective hole transport. They can be sublimed in vacuum to form thin films used in vacuum-evaporated organic solar cells.
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Głowacki, E.D., Sariciftci, N.S., Tang, C.W. (2013). Organic Solar Cells . In: Richter, C., Lincot, D., Gueymard, C.A. (eds) Solar Energy. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5806-7_466
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