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

AL-Busaidi, Z. and Pearson, C. and Groves, C. and Petty, M.C. (2016) 'Enhanced lifetime of organic photovoltaic diodes utilizing a ternary blend including an insulating polymer.', Solar energy materials and solar cells., 160 . pp. 101-106.


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 200 h, 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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Publisher statement:© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Date accepted:07 October 2016
Date deposited:13 October 2016
Date of first online publication:24 October 2016
Date first made open access:24 October 2017

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