Optical Design of Transparent Thin Metal Electrodes to Enhance In‐Coupling and Trapping of Light in Flexible Polymer Solar Cells

ITO-free polymer solar cells with efficiencies as high as 6.6% and 5.8% are fabricated on glass and polyethylene naphthalate (PEN) by using TeO2 to enhance the in-coupling of light in an Ag–Ag microcavity. These cells exhibit higher performance, selective microcavity resonance as a function of the thickness of TeO2, and better bending stability than flexible devices made with ITO. Detailed facts of importance to specialist readers are published as "Supporting Information". Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.