Journal
ORGANIC ELECTRONICS
Volume 93, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2021.106139
Keywords
Organic solar cells; Non-fullerene acceptor; Hole transport layer; Ferrous oxides; Ultraviolet-ozone
Funding
- National Natural Science Foundation of China [61804153, 51773204]
- DICP [ZZBS201714, 2019-MS-325]
- Star of Dalian science and technology
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In this study, low-temperature solution-processing ferrous oxide films were used as hole transporting layer (HTL) for NF-OSCs, with UVO treatment to achieve uniform films with adjustable energy bands. Among the NF-OSCs using different ferrous oxide films as HTL, the UVO-treated CoOx exhibited the highest performance, attributed to its more suitable energy level alignment and better hole transportation property.
Non-fullerene organic solar cells (NF-OSCs) have recently attracted enormous attention due to the rapid advance of high-performance photoabsorbers. On the other hand, interfacial materials also play a crucial role in further increasing the device efficiency, but those materials in particular effective hole transporting ones for NF-OSCs are less developed. In this work, three low-temperature solution-processing ferrous oxide films (including CoOx, NiOx, and FeOx) are used as hole transporting layer (HTL) for NF-OSCs. By adding a surfactant and treating with the ultraviolet ozone (UVO), uniform ferrous oxide films with adjustable energy bands are achieved. The NF-OSCs based on PBDB-T-2Cl:IT-4F active layer and using CoOx, NiOx, and FeOx as the HTL afford power conversion efficiencies of 11.4%, 10.2% and 6.4%, respectively. The higher performance of NF-OSCs with the UVO-treated CoOx as the HTL is attributed to its more suitable energy level alignment and better hole transportation property relative to those of the other two counterparts.
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