4.8 Article

Polymerized Small-Molecule Acceptor as an Interface Modulator to Increase the Performance of All-Small-Molecule Solar Cells

Journal

ADVANCED ENERGY MATERIALS
Volume 12, Issue 3, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202102394

Keywords

all-small-molecule OSCs; interface modulators; morphology; polymerized small-molecule acceptors

Funding

  1. National Natural Science Foundation of China [51973044, 21721002, 51961135103]
  2. Youth Innovation Promotion Association, Chinese Academy of Sciences
  3. Strategic Priority Research Program of Chinese Academy of Sciences [XDB36000000]

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The study introduces a polymerized small-molecule acceptor (PJ1) as an interface modulator to optimize the morphology of all-small-molecule organic solar cells (ASM-OSCs) and improve power conversion efficiency. Adding a small amount of PJ1 effectively condenses the morphology, enhances crystallinity, and decreases domain sizes in ASM-OSCs, ultimately leading to accelerated hole transfer and enhanced charge transport.
Modulating the morphology of all-small-molecule organic solar cells (ASM-OSCs) has proved to be a considerable challenge in the context of efficient exciton dissociation and charge transport. Regulating the morphology of ASM-OSCs is a great challenge due to the low viscosity of the small molecules, which tend to form large domain sizes and loose molecular packing, especially in the interfacial region. Here, a polymerized small-molecule acceptor (PJ1) is introduced as an interface modulator to strengthen the interfacial molecular interactions in a high-efficiency system, consisting of a novel small molecule donor (ZR-TT) and a widely used acceptor (Y6). Optimized ASM-OSCs exhibit a power conversion efficiency (PCE) of 14.33% without any additives. A small amount of PJ1 effectively condenses the morphology, enhances the crystallinity of the blend, and decreases the domain sizes. Upon 3% PJ1 addition in the blends, the accelerated hole transfer and the enhanced charge transport ultimately lead to an increased PCE of 15.54% with improved short circuit current and fill factor. Notably, the generality of this interfacial modulator strategy is proved by using PJ1 in three other ASM-OSCs and using another polymerized host acceptor, PYT-F-o.

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