Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 33, Pages 39671-39677Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c11332
Keywords
organic solar cells; cathode interlayers; power conversion efficiency; Ti-oxo clusters; titanium oxide nanomaterial
Funding
- MOST [2018YFA0208504, 2017YFA0204702, 2020YFC1909002]
- NSFC of China [21801213, 51773207, 52073016, 5197030531, 21905018]
- Fundamental Research Funds for the Central Universities [XK1802-2]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [sklssm202043]
- Jiangxi Provincial Department of Science and Technology [20192ACB20009, 20202ACBL213004, 20203BBE53062]
- Jiangxi Academy of Sciences [2020YZD-3]
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Three independent Ti-oxo clusters with precise chemical structures are developed as cathode interlayers in OSCs, providing high power conversion efficiency. These TOCs have excellent solubility, well-aligned work function, and can easily form smooth films.
Three independent Ti-oxo clusters (TOCs) that contain 6, 8, and 12 Ti atoms in the cores and alkyl groups on the surface were developed as cathode interlayers in bulk-heterojunction organic solar cells (OSCs). These TOCs have precise chemical structures with a single crystal, excellent solubility in methanol, and well-aligned work function. Smooth films can be facilely obtained by spin-casting their solution on top of the active layer. Therefore, they can be used as an interlayer in OSCs to provide a high power conversion efficiency (17.29%). Further studies reveal that these TOCs can not only reduce the work function of the silver electrode to provide better energy level alignment but also exhibit a significant n-doping effect with the non-fullerene acceptors to facilitate efficient electron extraction and transport. Our results demonstrate that TOCs as semiconductors have great potential application in OSCs.
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