TY - JOUR
T1 - Charge transport by superexchange in molecular host-guest systems
AU - Symalla, F.
AU - Friedrich, P.
AU - Massé, A.
AU - Meded, V.
AU - Coehoorn, R.
AU - Bobbert, P.A.
AU - Wenzel, W.
PY - 2016/12/29
Y1 - 2016/12/29
N2 - Charge transport in disordered organic semiconductors is generally described as a result of incoherent hopping between localized states. In this work, we focus on multicomponent emissive host-guest layers as used in organic light-emitting diodes (OLEDs), and show using multiscale ab initio based modeling that charge transport can be significantly enhanced by the coherent process of molecular superexchange. Superexchange increases the rate of emitter-to-emitter hopping, in particular if the emitter molecules act as relatively deep trap states, and allows for percolation path formation in charge transport at low guest concentrations.
AB - Charge transport in disordered organic semiconductors is generally described as a result of incoherent hopping between localized states. In this work, we focus on multicomponent emissive host-guest layers as used in organic light-emitting diodes (OLEDs), and show using multiscale ab initio based modeling that charge transport can be significantly enhanced by the coherent process of molecular superexchange. Superexchange increases the rate of emitter-to-emitter hopping, in particular if the emitter molecules act as relatively deep trap states, and allows for percolation path formation in charge transport at low guest concentrations.
UR - http://www.scopus.com/inward/record.url?scp=85009471270&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.117.276803
DO - 10.1103/PhysRevLett.117.276803
M3 - Article
C2 - 28084749
AN - SCOPUS:85009471270
SN - 0031-9007
VL - 117
JO - Physical Review Letters
JF - Physical Review Letters
IS - 27
M1 - 276803
ER -