Polymer Donors Capable of Hydrogen-Bondings Afford Efficient and Stretchable Organic Solar Cells
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Intrinsically stretchable organic solar cells (IS-OSCs) announced the new generation of wearable power sources. However, popular active materials are brittle, limitting its stretchability. Here, we develop highly efficeint and durable IS-OSCs, by a new polymer donors (PDs, PM6- PhAmX (X=0, 3, 5, and 10)) capable of hydrogen-bonding (H-bonding). The incorporation of phenyl amide spacer (PhAm-FS) into the PDs increases the stretchability by enhanced molecular interaction from H-bonding. Consequently, the high power conversion efficiency (PCE, 17.5%) and crack onset strain (COS, 13.8%) were demonstrated in the PM6-PhAm5:Y7 blend, outclassing than PM6:Y7 blend (PCE = 15.5% and COS = 1.8%). More importantly, the IS-OSC based on the PM6-PhAm5:Y7 blend achieves the highest PCE (12.62%) among the reported IS-OSCs, and demonstrates outstanding stretchability.