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Electrochemical Considerations for Determining Absolute Frontier Orbital Energy Levels of Conjugated Polymers for Solar Cell Applications
Author(s) -
Cardona Claudia M.,
Li Wei,
Kaifer Angel E.,
Stockdale David,
Bazan Guillermo C.
Publication year - 2011
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201004554
Subject(s) - materials science , organic solar cell , conjugated system , ferrocene , acceptor , energy conversion efficiency , band gap , photovoltaics , electrochemistry , cyclic voltammetry , electrode , polymer , solar cell , nanotechnology , homo/lumo , photovoltaic system , optoelectronics , chemistry , organic chemistry , condensed matter physics , electrical engineering , physics , engineering , composite material , molecule
Abstract Narrow bandgap conjugated polymers in combination with fullerene acceptors are under intense investigation in the field of organic photovoltaics (OPVs). The open circuit voltage, and thereby the power conversion efficiency, of the devices is related to the offset of the frontier orbital energy levels of the donor and acceptor components,1, 2 which are widely determined by cyclic voltammetry. Inconsistencies have appeared in the use of the ferrocenium/ferrocene (Fc + /Fc) redox couple, as well as the values used for the absolute potentials of standard electrodes, which can complicate the comparison of materials properties and determination of structure/property relationships.