Enhanced lifetime of organic photovoltaic diodes utilizing a ternary blend including an insulating polymer

We report on the lifetime of unencapsulated organic photovoltaic diodes (OPVs) based on a ternary blend of poly(3-hexylthiophene) (P3HT), phenyl-C61-butyric acid methyl ester (PCBM) and a soft insulating polymer, poly(methyl methacrylate) (PMMA) as compared to reference binary P3HT:PCBM OPVs. The pe...

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Bibliographic Details
Published in:Solar energy materials and solar cells 2017-02, Vol.160, p.101-106
Main Authors: AL-Busaidi, Zakiya, Pearson, Christopher, Groves, Christopher, Petty, Michael C.
Format: Article
Language:English
Subjects:
Bulk heterojunction
Butyric acid
Decay rate
Degradation
Diodes
Energy conversion efficiency
Lifetime
Matrix
Organic light emitting diodes
Organic photovoltaic
Photovoltaic cells
Photovoltaics
Pillars
Polymethyl methacrylate
Polymethylmethacrylate
Recombination
Relative humidity
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Summary:We report on the lifetime of unencapsulated organic photovoltaic diodes (OPVs) based on a ternary blend of poly(3-hexylthiophene) (P3HT), phenyl-C61-butyric acid methyl ester (PCBM) and a soft insulating polymer, poly(methyl methacrylate) (PMMA) as compared to reference binary P3HT:PCBM OPVs. The performance of ternary devices was shown to decay more slowly than that of their binary counterparts to an extent that depends on the relative humidity (RH). The power conversion efficiency of ternary OPVs when stored in a low humidity environment (1% RH) decayed to 80% of their initial value after 200h, almost double that of the reference binary OPVs. AFM measurements suggest that the PMMA forms pillars within the P3HT:PCBM matrix. It is proposed that the PMMA absorbs water in the active layer, and in doing so, slows the rate of deep trap formation that would otherwise lead to enhanced Shockley-Read-Hall recombination. •The addition of PMMA enhances the stability of P3HT:PCBM photovoltaic devices.•PMMA changes the film morphology and forms pillars.•PMMA absorbs water in the active layer.•It proposed that the PMMA slows the rate of deep trap formation.
ISSN:0927-0248
1879-3398
DOI:10.1016/j.solmat.2016.10.018