Geometrically controlled organic small molecule acceptors for efficient fullerene-free organic photovoltaic devices
- Authors
- Hadmojo, Wisnu Tantyo; Nam, So Youn; Shin, Tae Joo; Yoon, Sung Cheol; Jang, Sung-Yeon; Jung, In Hwan
- Issue Date
- Aug-2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.4, no.31, pp.12308 - 12318
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 4
- Number
- 31
- Start Page
- 12308
- End Page
- 12318
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/22249
- DOI
- 10.1039/c6ta04344e
- ISSN
- 2050-7488
- Abstract
- Organic small molecule (SM) acceptors containing a perylene diimide (PDI) moiety, F2B-T2PDI and T2PDI are synthesized, and the effects of their molecular geometry on the performance of fullerene-free organic photovoltaic (OPV) devices are investigated. The SM acceptors possess a PDI-core-PDI structure in which the PDI wing is connected to conjugated core units. By incorporation of a 2,5-difluorobenzene (F2B) moiety within the core unit, the planarity of the conjugated core is enhanced and the energy levels of the SM acceptor are down-shifted. In terms of molecular geometry, the F2B-containing SM acceptor, F2B-T2PDI, has a rigid core, which can symmetrically align the two PDI wings and enhance molecular packing. As a result, improved electron transport and bulk heterojunction morphology of the active layers are achieved. Furthermore, the incorporation of the F2B moiety effectively down-shifts the HOMO energy level, preventing back-transfer of holes from the acceptor to the cathode and enhancing the absorption of complementary wavelengths of the donor polymer, PTB7-Th. Leveraged by the beneficial geometric and energetic effects from the incorporation of F2B units, the power conversion efficiency of fullerene-free OPV devices using F2B-T2PDI reached 5%, whereas that using T2PDI was 3.63%.
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