n-Type core effect on perylene diimide based acceptors for panchromatic fullerene-free organic solar cells
- Authors
- Eom, Seung Hun; Kim, Hee Su; Do, Hee Jin; Lee, Un-Hak; Wibowo, Febrian Tri Adhi; Hwang, Do-Hoon; Yoon, Sung Cheol; Jung, In Hwan
- Issue Date
- Sep-2018
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Non-fullerene acceptor; Fullerene-free organic solar cells; n-Type core effect; Perylene diimide; Panchromatic absorption
- Citation
- DYES AND PIGMENTS, v.156, pp.318 - 325
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 156
- Start Page
- 318
- End Page
- 325
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/16078
- DOI
- 10.1016/j.dyepig.2018.04.018
- ISSN
- 0143-7208
- Abstract
- Perylene diimide (PDI) based high bandgap acceptors, DTBTP, DTF2BTP, and DTF2TZP, are synthesized for use in fullerene-free organic solar cells. The two PDI rings are connected to the end of the n-type core, forming a PDI-n-type core-PDI structure. Several n-type core materials, 4,7-dithieno-2,1,3-benzothiadiazole (DTBT), 5,6-difluoro-4,7-dithieno-2,1,3-benzothiadiazole (DTF2BT), and 4,6-difluoro-2H-benzo[d][1,2,3]triazole (DTF2TZ), are incorporated in the PDI acceptors and the n-type core effect on photovoltaic properties is studies. The introduction of alkyl side chains onto the core structure weakened the intermolecular interaction, whereas fluorination of the core structure improved the backbone planarity and intermolecular ordering. DTF2BTP having a planar core structure without bulky alkyl chains yielded the best power conversion efficiency, 4.41%, when mixed with PTB7-Th donor. The n-type core structure was beneficial in terms of increasing the electron accepting properties and the absorption in the high bandgap region of non-fullerene acceptors.
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