4.8 Article

Effects of Alkyl Side Chains of Small Molecule Donors on Morphology and the Photovoltaic Property of All-Small-Molecule Solar Cells

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 45, 页码 54237-54245

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c15377

关键词

all-small-molecule organic solar cells; small molecule donor materials; alkyl side chains; morphology; photovoltaic property

资金

  1. NSFC [91633301, 21734008, 51673200, 22005270]
  2. Basic and Applied Basic Research Major Program of Guangdong Province [2019B030302007]
  3. Zhejiang Provincial Natural Science Foundation of China [LQ21E030003]
  4. National Key R&D Program of China [2018YFB1500102]
  5. Key Research and Development Program of Zhejiang Province [2021C01006]

向作者/读者索取更多资源

By synthesizing small molecule donors with different flexible side chains and blending them with acceptors to form SM-OSCs, it was found that adjusting the flexible side chains can significantly affect the photovoltaic performance of the devices. SM-OSC based on n-octyl chains demonstrated higher PCE value, possibly attributed to its better molecular stacking properties.
Unraveling the relationship between nanoscale morphology of active layers and chemical structures of organic semiconductor photovoltaic materials is crucially important for further advancing the development of all-small-molecule organic solar cells (SM-OSCs). Here, in order to delve into the effect of flexible side chains of small molecule donors on the photovoltaic properties of SM-OSCs, we synthesized two new small molecule donors substituted by different flexible alkyl chains (iso-octyl chains for SM1-EH and n-octyl chains for SM1-Oct). As a result, the two small molecules present different absorption properties, energy levels, and stacking characteristics. When blending with Y6 as an acceptor, the SM1-Oct-based SM-OSC demonstrated a higher PCE value of 11.73%, while the SM1-EH-based device presents a relatively poorer PCE value of 8.42%. In addition, the morphology analysis demonstrated that, compared with the SM1-EH:Y6 blend, the SM1-Oct:Y6 blend film displayed better molecular stacking properties with stronger multilevel diffraction and preferable phase separation, resulting in the higher hole mobility, more efficient charge separation efficiency, and better device performance. These results underline that reasonably adjusting the flexible alkyl chains of small molecule donors can be an effective approach to further advance the development of the SM-OSCs field.

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