Morphology and interdiffusion control to improve adhesion and cohesion properties in inverted polymer solar cells

Stephanie R. Dupont, Eszter Voroshazi, Dennis Nordlund, Reinhold H. Dauskardt

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

© 2014 Elsevier B.V. All rights reserved. The role of pre-electrode deposition annealing on the morphology and the fracture properties of polymer solar cells is discussed. We found an increase in adhesion at the weak P3HT:PCBM/PEDOT:PSS interface with annealing temperature, caused by increased interdiffusion between the organic layers. The formation of micrometer sized PCBM crystallites, which occurs with annealing above the crystallization temperature of PCBM, initially weakened the P3HT:PCBM layer itself. Further annealing improved the cohesion, due to a pull-out toughening mechanism of the growing PCBM clusters. Understanding how the morphology, tuned by annealing, affects the adhesive and cohesive properties in these organic films is essential for the mechanical integrity of OPV devices.
Original languageEnglish (US)
Pages (from-to)443-449
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume132
DOIs
StatePublished - Jan 2015
Externally publishedYes

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