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Linking vertical bulk-heterojunction composition and transient photocurrent dynamics in organic solar cells with solution-processed MoOx contact layers

Tremolet de Villers, Bertrand J.; MacKenzie, Roderick C.I.; Jasieniak, Jacek J.; Treat, Neil D.; Chabinyc, Michael L.

Linking vertical bulk-heterojunction composition and transient photocurrent dynamics in organic solar cells with solution-processed MoOx contact layers Thumbnail


Authors

Bertrand J. Tremolet de Villers

Roderick C.I. MacKenzie

Jacek J. Jasieniak

Neil D. Treat

Michael L. Chabinyc



Abstract

It is demonstrated that a combination of microsecond transient photocurrent measurements and fi lm morphology characterization can be used to identify a charge-carrier blocking layer within polymer:fullerene bulk-heterojunction solar cells. Solution-processed molybdenum oxide (s-MoO x ) interlayers are used to control the morphology of the bulk-heterojunction. By selecting either a low- or high-temperature annealing (70 ?C or 150 ?C) for the s-MoO x layer, a well-performing device is fabricated with an ideally interconnected, high-efficiency morphology, or a device is fabricated in which the fullerene phase segregates near the hole extracting contact preventing efficient charge extraction. By probing the photocurrent dynamics of these two contrasting model systems as a function of excitation voltage and light intensity, the optoelectronic responses of the solar cells are correlated with the vertical phase composition of the polymer:fullerene active layer, which is known from dynamic secondary-ion mass spectroscopy (DSIMS). Numerical simulations are used to verify and understand the experimental results. The result is a method to detect poor morphologies in operating organic solar cells.

Journal Article Type Article
Acceptance Date Oct 14, 2014
Online Publication Date Oct 24, 2013
Publication Date Apr 30, 2014
Deposit Date Oct 30, 2018
Publicly Available Date Oct 30, 2018
Journal Advanced Energy Materials
Print ISSN 1614-6832
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 4
Issue 5
Article Number 1301290
DOI https://doi.org/10.1002/aenm.201301290
Public URL https://nottingham-repository.worktribe.com/output/1210938
Publisher URL https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201301290

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