Alternative selection of processing additives to enhance the lifetime of OPVs

Kettle, J., Waters, H., Horie, M. and Smith, G.C. (2016) Alternative selection of processing additives to enhance the lifetime of OPVs. Journal of Physics D: Applied Physics, 49(8), 085601. (doi: 10.1088/0022-3727/49/8/085601)

Abstract

The use of processing additives is known to accelerate the degradation of organic photovoltaics (OPVs) and therefore, this paper studies the impact of selecting alternative processing additives for PCPDTBT:PC71BM solar cells in order to improve the stability. The use of naphthalene-based processing additives has been undertaken, which is shown to reduce the initial power conversion efficiency by 23%–42%, primarily due to a decrease in the short-circuit current density, but also fill factor. However, the stability is greatly enhanced by using such additives, with the long term stability (T50%) enhanced by a factor of four. The results show that there is a trade-off between initial performance and stability to consider when selecting the initial process additives. XPS studies have provided some insight into the decreased degradation and show that using 1-chloronaphthalene (ClN) leads to reduced morphology changes and reduced oxidation of the thiophene-ring within the PCPDTBT backbone.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Kettle, Professor Jeff
• Authors: Kettle, J., Waters, H., Horie, M., and Smith, G.C.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Journal of Physics D: Applied Physics
• Publisher: IOP Publishing
• ISSN: 0022-3727
• ISSN (Online): 1361-6463
• Published Online: 27 January 2016