Dual-Percolative Planar-Heterojunction Photoactive System for High-Performance Stretchable Organic Photovoltaics
발표자
배기현 (한국과학기술원)
연구책임자
김범준 (한국과학기술원)
초록
내용
Intrinsically stretchable organic solar cells are promising candidates for wearable power sources due to their ability to deform in multiple directions. We present a new dual percolative planar-heterojunction (DP-PHJ) photoactive architecture, where the bottom and top layers comprise polymer donors (D18) and small-molecule acceptors (L8-BO), respectively, each at its percolation threshold relative to the other component. The interconnected D18 and L8-BO networks in both layers promote extensive donor–acceptor interfaces and efficient charge transport pathways. Simultaneously, robust D18 networks in the bottom layer dissipate mechanical stress, while percolated D18 in the top layer alleviates brittleness of L8-BO. Consequently, DP-PHJ-based OSCs exhibit superior PCE (19%) and mechanical robustness (4.4 MJ m−3) compared to bulk-heterojunction (BHJ, PCE = 18% and toughness = 1.6 MJ m−3) and conventional PHJ (PCE = 17% and toughness = 3.1 MJ m−3) systems.