Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 132, Issue -, Pages 443-449Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2014.09.013
Keywords
Adhesion and delamination; Cohesion; Reliability; Polymer solar cells; Annealing; NEXAFS
Funding
- Center for Advanced Molecular Photovoltaics (CAMP), King Abdullah University of Science and Technology (KAUST) [KUS-C1-015-21]
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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. (C) 2014 Elsevier B.V. All rights reserved.
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