TY - JOUR
T1 - Charge-separation energy in films of π -conjugated organic molecules
AU - Hill, I. G.
AU - Kahn, A.
AU - Soos, Z. G.
AU - Pascal, R. A.
N1 - Funding Information:
Support of this work by the MRSEC program of the National Science Foundation (DMR-9809483) is gratefully acknowledged. One of the authors (I.H.) acknowledges support from the NSERC of Canada.
PY - 2000/9/8
Y1 - 2000/9/8
N2 - We use inverse photoelectron spectroscopy (IPES) and ultraviolet photoelectron spectroscopy (UPS) to investigate unoccupied and occupied electronic states of five organic semiconductor materials: CuPc (copper phthalocyanine), PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride), α-6T (α-sexithiophene), α-NPD (N,N′-diphenyl-N,N′-bis(l-naphthyl)-l,l′ biphenyl-4,4′′ diamine), and Alq3 (tris(8-hydroxy-quinoline)aluminum). The transport gap, Et, is the difference between the highest occupied and lowest unoccupied molecular orbitals, measured via UPS and IPES. The charge separation energy, or exciton binding energy, is the difference between Et and the optical gap, Eopt, measured via absorption. Et-Eopt in these correlated materials ranges from 0.4 to1.4 eV.
AB - We use inverse photoelectron spectroscopy (IPES) and ultraviolet photoelectron spectroscopy (UPS) to investigate unoccupied and occupied electronic states of five organic semiconductor materials: CuPc (copper phthalocyanine), PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride), α-6T (α-sexithiophene), α-NPD (N,N′-diphenyl-N,N′-bis(l-naphthyl)-l,l′ biphenyl-4,4′′ diamine), and Alq3 (tris(8-hydroxy-quinoline)aluminum). The transport gap, Et, is the difference between the highest occupied and lowest unoccupied molecular orbitals, measured via UPS and IPES. The charge separation energy, or exciton binding energy, is the difference between Et and the optical gap, Eopt, measured via absorption. Et-Eopt in these correlated materials ranges from 0.4 to1.4 eV.
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U2 - 10.1016/S0009-2614(00)00882-4
DO - 10.1016/S0009-2614(00)00882-4
M3 - Article
AN - SCOPUS:0001174145
SN - 0009-2614
VL - 327
SP - 181
EP - 188
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3-4
ER -