Single‐Junction Organic Photovoltaic Cell with 19% Efficiency

Abstract Improving power conversion efficiency (PCE) is important for broadening the applications of organic photovoltaic (OPV) cells. The improved light unitization, cascaded energy level alignment, and enhanced intermolecular packing result in open‐circuit voltage of 0.879 V, short‐circuit current density of 26.7 mA cm −2 , and fill factor of 0.809.

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• 1 Here, a maximum PCE of 19.0% (certified value of 18.7%) is achieved in single‐junction OPV cells by combining material design with a ternary blending strategy.
• 2 An active layer comprising a new wide‐bandgap polymer donor named PBQx‐TF and a new low‐bandgap non‐fullerene acceptor (NFA) named eC9‐2Cl is rationally designed.
• 3 With optimized light utilization, the resulting binary cell exhibits a good PCE of 17.7%.

This work deepens our understanding of the fundamental laws governing the universe, from subatomic particles to cosmic structures.

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