Intensity and Wavelength Dependence of Bimolecular Recombination in P3HT:PCBM Solar Cells: A White-Light Biased External Quantum Efficiency Study

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dc.contributor.ISNI0000 0003 8600 0978 (Hsu, JWP)
dc.contributor.VIAF243648305 (Hsu, JWP)
dc.contributor.authorCowan, S. R.en_US
dc.contributor.authorWang, J.en_US
dc.contributor.authorYi, J.en_US
dc.contributor.authorLee, Y. -Jen_US
dc.contributor.authorOlson, D. C.en_US
dc.contributor.authorHsu, Julia W. P.en_US
dc.date.accessioned2014-07-11T15:54:57Z
dc.date.available2014-07-11T15:54:57Z
dc.date.created2013-04-17en_US
dc.date.submitted2013-02-13en_US
dc.description.abstractBimolecular recombination is often a major photogenerated charge carrier loss mechanism in organic photovoltaic (OPV) devices, resulting in lower fill factor (FF) compared to inorganic devices. The recombination parameter α can be obtained from the power law fitting of short-circuit current (J sc) on illumination intensity (I), J s c ∝ I , with α values less than unity taken as an indication of reduced photon-to-electron extraction efficiency and the presence of bimolecular recombination in OPV. Here, we show that this intensity-averaged measurement is inadequate. An external quantum efficiency (EQE) apparatus under constant white-light bias can be used to measure the recombination parameter (αEQE*) as a function of wavelength and carrier density (white-light intensity). Examining the dependence of α on background white-light bias intensity and excitation wavelength provides further understanding of photon-to-electron conversion loss mechanisms in P3HT:PCBM bulk heterojunction devices in standard and inverted architectures. In order to compare EQE and current-voltage (JV) measurements, we discuss the special case of devices exhibiting sub-linear intensity response (α <1). Furthermore, we demonstrate several important advantages of the white-light biased EQE method of measuring bimolecular recombination compared to existing methods, including sensitivity in probing intensity-dependent recombination compared to steady-state JV measurements, the correlation of αEQE and FF in devices, elucidation of recombination mechanisms through spectral dependence of carrier loss, and the robustness of αEQE obtained via integration over the entire absorption region. Furthermore, this technique for measuring recombination is immediately accessible to the vast majority of researchers as the EQE apparatus is ubiquitous in PV research laboratories.en_US
dc.identifier.citationCowan, S. R., J. Wang, J. Yi, Y. -J. Lee, et al. 2013. "Intensity and wavelength dependence of bimolecular recombination in P3HT:PCBM solar cells: A white-light biased external quantum efficiency study." 113(154504): 1-9.en_US
dc.identifier.issn0021-8979en_US
dc.identifier.issue154504en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/3648
dc.identifier.volume113en_US
dc.language.isoenen_US
dc.relation.urihttp://dx.doi.org/10.1063/1.4801920en_US
dc.rights©2013 AIP Publishing LLC Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions.en_US
dc.subjectBiomolecular recombinationen_US
dc.subjectSolar cellsen_US
dc.subjectWhite lighten_US
dc.titleIntensity and Wavelength Dependence of Bimolecular Recombination in P3HT:PCBM Solar Cells: A White-Light Biased External Quantum Efficiency Studyen_US
dc.title.alternativeJournal of Applied Physicsen_US
dc.typetexten_US
dc.type.genrearticleen_US

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