Achieving 12.6% Efficiency in Single-Component Organic Solar Cells Processed from Nonhalogenated Solvents

作者：Guo, Jing; Wu, Yao; Wang, Wei; Wang, Tao; Min, Jie^*

来源：Solar RRL, 2022, 6(6): 2101024.

DOI：10.1002/solr.202101024

• cost-effective methods
• high efficiency
• nonhalogenated solvents
• single-component organic solar cells
• stability

Single-component organic solar cells (SCOSCs), which contain only one photoactive material in their active layers, promise many advantages with respect to the excellent device and morphological stabilities and a simplified film fabrication process. However, most of the high-efficiency SCOSCs are fabricated by halo-genated solvents. Herein, the eco-friendly and highly efficient SCOSCs based on a conjugated block copolymer PBDB-T-b-PYT with power conversion efficiencies (PCEs) of over 12% are developed by utilizing a series of halogen-free processing solvents (including tetrahydrofuran, toluene, o-xylene), being higher than those of the devices cast from halogenated solvents (including chloroform, chlorobenzene, 1,2-dichlorobenzene). Impressively, by using o-xylene as processing solvent for the PBDB-T-b-PYT active layer, high and balanced charge transport properties, and well-developed morphological features are observed, leading to a high PCE of 12.60%, which is the highest value among SCOSCs to date. Importantly, the non-halogenated solvents-processed devices exhibited better storage and operational stabilities as compared to the chloroform (CF)-processed SCOSCs. More importantly, higher photovoltaic performance (over 12% PCEs) of the green-solvent-processed devices as compared with the CF-processed devices fabricated by blade coating in ambient conditions are achieved, suggesting the promising prospects of SCOSCs toward industrial production, particularly being relevant for environmentally benign solvents.

• 单位
  武汉大学; 郑州大学