Title: NIST Researches Exciton and Charge Transport Dynamics in Organic Semiconductors
Organic semiconductors, which form excitons with binding energies above 300 meV, are of particular interest for their ability to manipulate energy-carrying states at room temperature. NIST researchers are developing specialized device fabrication and measurement suites to study the relationship between device performance and exciton dynamics in organic semiconductors.
Key findings include:
– Room temperature excitons, made of bound electron-hole pairs, can live longer and demonstrate quantum phenomena at long timescales
– Sub-microsecond dynamics of singlet and triplet exciton populations impact performance of organic photovoltaic (OPV) and light-emitting diode (OLED) devices
– Organic semiconductors exhibit unique charge carrier-phonon interactions, with charges being “pushed around” by phonons through molecular displacements
The research aims to establish connections between macroscopic device performance and quantum-level processes related to alternative carriers like excitons and spin, providing scientific understanding to drive technological development in organic semiconductors.
Source: https://www.nist.gov/programs-projects/exciton-and-charge-transport-dynamics-organic-semiconductors
Keywords: excitons, semiconductors, phonons
