Highly efficient top-illuminated organic solar cells with microcavity structures are numerically simulated and fabricated by H.-W. Lin, K.-T. Wong, and co-workers on page 2269. The high efficiencies are primarily attributed to the thin, electrically optimized active layers and the panchromatic simulation programdesigned in-cell and out-of-cell optical resonance structures, incorporating favorable materials with good electrical and optical properties. Given the insensitivity of the substrate, this approach offers a new step toward highly efficient organic solar cells on all kinds of substrates.
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