High-Performance All-Polymer Solar Cells Based on
Face-On Stacked Polymer Blends with Low Interfacial Tension
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Abstract
We report highly efficient all-polymer
solar cells with power conversion
efficiencies of over 4.5% by highly intermixed blends of PTB7-Th donor
and P(NDI2OD-T2) acceptor polymers. The low interfacial tension and
the face-on π–π stackings of the all-polymer blends
afforded desired nanophase morphology, which facilitates efficient
charge transport from the active layer to each electrode. In addition,
the incorporation of 1,8-diiodooctane additives was able to tune the
degree of crystallinity and orientation of P(NDI2OD-T2) acceptors,
resulting in remarkable enhancement of electron mobility, external
quantum efficiency, and <i>J</i><sub>SC</sub> values