Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 12, Pages 5843-5847Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00159g
Keywords
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Funding
- National Youth Thousand Program Project [R52A199Z11]
- National Special Funds for Repairing and Purchasing Scientific Institutions [Y72Z090Q10]
- Artificial Intelligence Key Project of Chongqing [cstc2017rgzn-zdyfX0030]
- National Natural Science Foundation of China [61805245, 21702202, 51873160]
- Youth Innovation Promotion Association CAS [2019373]
- CAS Pioneer Hundred Talents Program [Y82A060Q10, Y92A160Q10]
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxm2027]
- Innovation Fund Denmark (INKA project)
- Sino-Danish Centre for Education and Research (SDC)
- Recruitment Program of Global Experts [R52A199Z10]
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Recent work has emphasized the pivotal role of halogen substituents in the development of polymer donors or small-molecule (SM) acceptors for efficient bulk-heterojunction (BHJ) solar cells. However, the application of -F or -Cl substitutions in the design of SM donors is yet to receive similar considerations. In this contribution, we report a set of oligothiophene derivatives (2F7T and 2Cl7T) with halogenation at the central thienyl moiety. Such halogenation is shown to induce a sufficient increase in ionization potential (IP; i.e. deeper HOMO) to modify the electron-donating and -transporting characteristics of the molecules. When combined with a low-bandgap SM acceptor (Y6), the devices with 2Cl7T achieved power conversion efficiencies (PCEs) of up to ca. 11.5% (vs. ca. 2.5% for non-halogenated donor DRCN7T based devices), representing the best photovoltaic performance of oligothiophene donors.
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