[2PS-139]
Asymmetric Interactions from Symmetric Molecular Structure Lead to Efficient and Diurnally Stable Semitransparent Organic Solar Modules
발표자양상진 (울산과학기술원)
연구책임자양창덕 (울산과학기술원)
Abstract
Although symmetry-breaking designs in nonfullerene acceptors (NFAs) can enhance semitransparent organic solar cell (ST-OSC) performance, asymmetric interactions from symmetric structures remain unexplored. Here, we show that symmetric 4FY, with 2D fluorophenyl outer groups, enables dipole-driven self-assembly via asymmetric interactions, resulting in tighter packing than Y6. This leads to efficient layer-by-layer OSCs with reduced energy/recombination losses and improved charge transport. ST-OSCs based on PCE10-2F/4FY reach 10.81% PCE, 45.43% AVT, and 4.91% LUE. Notably, the device shows excellent diurnal cycling stability with a T80 of 134 h—about 17× that of PCE10-2F/Y6. Large-area (18 cm²) modules based on PCE10-2F/4FY deliver 6.78% PCE and record-high 3.10% LUE among narrow-bandgap ST-OSCs. This work introduces a design strategy where symmetric NFAs induce beneficial asymmetric interactions for scalable, stable, and high-efficiency ST-OSCs.