Air Processed P3HT: PCBM Photovoltaic Cells: Morphology Correlation To Annealing, Degradation, and Recovery

Document Type

Article

Publication Date

12-1-2014

School

Polymer Science and Engineering

Abstract

Systematically varied annealing, encapsulation, and solvent vapor treatments are conducted to produce stable OPV devices with controlled film morphology and high performance when produced in air. Active layer films are analyzed by AFM, nanomechanical mapping, UV-vis spectroscopy, and XRD. Devices prepared with isopropanol solvent vapor annealing (SVA) combined with thermal annealing (TA) show the highest environmental resistance and performance. Such devices yield average PCE of 3.3%, with stability to atmospheric exposure of up to 60 min prior to encapsulation. Encapsulated devices exposed to the laboratory environment for 30 days exhibit a decrease in PCE of ∼15%. On application of a second TA step PCE is recovered to over 90% of the original value. The unprecedented air stability of the cells is attributed to the formation of an active layer with a stable, favorable morphology during the SVA process, which is associated with lower oxygen content films.

Publication Title

Journal of Polymer Science, Part B: Polymer Physics

Volume

52

Issue

23

First Page

1511

Last Page

1520

Link to Full Text

Find in your library

Share

COinS