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Central Molecular Stacking Regulator Boosts the Efficiency of Organic Solar Cells
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DOI：10.1002/adfm.202525577.png)
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Abstract
En 中文
Central unit engineering in non-fullerene acceptors (NFAs) plays a pivotal role in regulating molecular stacking, and further greatly affects the power conversion efficiency (PCE) of organic solar cells (OSCs). A high-efficiency NFA of CS4 is developed in this work, with a sulfur-bridged and chlorinated phenyl group on the central unit as a molecular stacking regulator. Detailed analyses reveal that CS4 exhibits tighter molecular packing, more balanced charge mobility, superior phase separation, and reduced energetic disorder compared to its counterpart, CH3. As a result, a notable efficiency of 18.57% is observed in the D18:CS4-based binary OSC, much higher than 17.81% for that of CH3. Moreover, D18:CS4:BTP-eC9-based ternary device renders a champion PCE of 20.16%. D18:CS4 and ternary devices exhibit enhanced stability over D18:CH3. Under the pressure of 65 °C, T80 lifetimes are 1200 h for D18:CS4 and 2500 h for D18:CS4:BTP-eC9-based ternary device. Under continuous light illumination, T80 reaches 550 and 710 h, respectively. This study demonstrates an effective strategy to boost high-performance OSCs through precise design of central molecular stacking regulator.
Keywords:
central unit
molecular stacking
non-fullerene acceptors
organic solar cells
sulfur-bridged
Journal
IF:
19
Papers:
3.4W
Citations:
32.1W