Open AccessSEPARAZIONE DI CARICA IN MISCELE DI MATERIALI ORGANICI: VALE LA LEGGE DI COULOMB?
Author(s) -
Guido Raos
Publication year - 2020
Publication title -
rendiconti. classe di scienze matematiche e naturali
Language(s) - English
Resource type - Journals
eISSN - 2384-986X
pISSN - 1974-6989
DOI - 10.4081/scie.2019.691
Subject(s) - coulomb , electron , charge (physics) , physics , delocalized electron , photon , absorption (acoustics) , charge carrier , condensed matter physics , quantum mechanics , optics
After a brief introduction to organic photovoltaic materials, I discuss the problem of charge separation in these systems. In the best devices, the excitations produced by absorption of a photon can be converted into positive and negative charge carriers (holes and electrons, respectively) with near-100% efficiency. Such efficiencies are apparently at odds with Coulomb’s law, which would lead to change recombination due to their mutual electrostatic attraction. A theoretical model developed within my group overcomes this apparent contradiction, by taking into account quantum mechanical effects such as the delocalization of the charge carriers.