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Effect of dopant concentration on charge transport in crosslinkable polymers
Author(s) -
Pitarch Angeles,
Meerholz Klaus,
Hertel Dirk
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200743457
Subject(s) - dopant , materials science , doping , space charge , polymer , voltage , triphenylene , capacitance , diamine , analytical chemistry (journal) , polymer chemistry , chemical engineering , optoelectronics , chemistry , composite material , organic chemistry , electrical engineering , physics , electrode , liquid crystal , quantum mechanics , engineering , electron
Crosslinkable polymer hole‐only structures have been characterized by current–voltage, and admittance spectroscopy. Our hole transport layer (HTL) consists of a triphenylene‐diamine derivative (QUPD) crosslinked after deposition with a photoinitiator. The crosslinking leads inadvertently to doping of the HTL depending on the initiator concentration. We study the influence of doping on charge transport in the HTL. We show that the increase of low‐frequency capacitance with increasing voltage and dopant concentration, as well as the low‐voltage region in the ( J – V ) characteristics are injection limited. At higher voltages, the transport is space‐charge limited (SCL) with a field‐dependent mobility. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)