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Probing Charge Recombination Dynamics in Organic Photovoltaic Devices under Open‐Circuit Conditions
Author(s) -
Elliott Lindsay C. C.,
Basham James I.,
Pernstich Kurt P.,
Shrestha Pragya R.,
Richter Lee J.,
DeLongchamp Dean M.,
Gundlach David J.
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201400356
Subject(s) - materials science , charge carrier , optoelectronics , recombination , dielectric spectroscopy , photovoltaic system , open circuit voltage , charge (physics) , organic solar cell , chemical physics , molecular physics , voltage , electrode , physics , chemistry , polymer , electrical engineering , electrochemistry , biochemistry , quantum mechanics , engineering , composite material , gene
Large perturbation transient photovoltage and impedance spectroscopy measurements are used to gain insights into recombination in organic photovoltaic devices. The combination of these two simple optoelectronic techniques enables characterization of recombination order as well as mobile and trapped charge evolution over a large range of carrier densities. The data show that trapped charge is approximately equal to total charge at low carrier densities in the high efficiency devices measured. Between low and high charge carrier density, the order of recombination is observed to vary from monomolecular to bimolecular to higher order. The new techniques and methods presented can be applied to any type of photovoltage device to gain insight into device operation and limitations.