Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 14, Issue 5, Pages 3174-3183Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ee00051a
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [51773157, 52061135206]
- opening project of Key Laboratory of Materials Processing and Mold
- Beijing National Laboratory for Molecular Sciences [BNLMS201905]
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In this study, a two-step solvent treatment strategy was introduced to construct high-performance all-small-molecule solar cells without interfacial layers, showing improved efficiency and good generality across different systems. This strategy has the potential to enhance device stability, extend the lifespan of ITO substrates, and reduce production costs of modules.
In this work, we report a two-step solvent treatment (TSST) strategy to construct high-performance all-small-molecule solar cells (all-SMSCs) without interfacial layers (IFLs), which only consist of an active layer (AL) sandwiched between two electrodes. The chlorinated ITO (ITO-Cl) anode exhibits down-shifted work functions and improved surface energy enabled by the presence of a large density of chloride ions caused by the surface chlorination of ITO. Moreover, the Al cathode shows elevated vacuum level and reduced interfacial trap density enabled by surface treatment of the active layer with polar methanol. The ITO-Cl/AL/Al-based devices form Ohmic contacts and boost the efficiency of the B1:BTP-eC9 system to 14.86%, which is higher than that of the control device (13.92%) with two IFLs. The use of this TSST strategy in the other two all-small-molecule systems is also confirmed, demonstrating its good generality. This strategy can significantly improve device stabilities, extend the life cycles of ITO substrates, and reduce modules' production costs.
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