TY - JOUR
AU - Li, Yongfang
AB - The use of non-halogenated solvents for the green manufacture of high-efficiency organic solar cells (OSCs) is important for their future application. However, the power conversion efficiency (PCE) of the non-halogenated solvent processed OSCs is generally lower than their halogenated counterpart due to the poor film microstructure caused by the solubility issue. Herein, we propose a halogen-free solvent system to optimize film microstructure of the photovoltaic blend based on the polymer donor D18 and small-molecule acceptor (SMA) L8-BO towards high-efficiency OSCs. The solvent system is consisted of a main solvent carbon disulfide and an additive paraxylene, where the former ensures the good solution-processability and promotes the solution aggregation of L8-BO, and the latter can finely control the phase-separation process by selectively dissolving the SMA. This solvent combination robustly produces a high-quality active layer, i.e., the bicontinuous networks of donor and acceptor with nano-sized phase-separation and strong π−π stacking. With the effective charge generation, transport and collection, the resulting device from the non-halogenated solvent system shows a high PCE of 17.50%, which is comparable to that of the device prepared from the halogenated solvent chloroform (ca. 17.11%). This article proposes a new strategy for the green fabrication of high-efficiency OSCs to accelerate their industrialization.[graphic not available: see fulltext]
TI - High-efficiency organic solar cells processed from a halogen-free solvent system
JF - Science China Chemistry
DO - 10.1007/s11426-023-1608-6
DA - 2023-08-01
UR - https://www.deepdyve.com/lp/springer-journals/high-efficiency-organic-solar-cells-processed-from-a-halogen-free-5mCqNDxxph
SP - 2380
EP - 2388
VL - 66
IS - 8
DP - DeepDyve
ER -