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Yang, Changduk
Advanced Tech-Optoelectronic Materials Synthesis Lab (ATOMS)
Research Interests
  • Optoelectronic materials synthesis/organic electronics, functionalization of carbonaceous solids, advanced materials chemistry, macromolecular chemistry

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Molecular ordering and phase segregation induced by a volatile solid additive for highly efficient all-small-molecule organic solar cells

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Title
Molecular ordering and phase segregation induced by a volatile solid additive for highly efficient all-small-molecule organic solar cells
Author
Chen, ShanshanYe, JunfengYang, QianguangOh, JiyeonHu, DingqinYang, KeOdunmbaku, George OmololuLi, FengYu, QingqingKan, ZhipengXiao, ZeyunYang, ChangdukLu, ShirongSun, Kuan
Issue Date
2021-02
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.9, no.5, pp.2857 - 2863
Abstract
Morphology control remains a major challenge for all-small-molecule organic solar cells (ASM OSCs), mainly reflecting in the elusive trade-off between the molecular ordering and phase separation of the active layer. In this study, a novel volatile solid additive IC-FI, namely dihalogenated 1,1-dicyanomethylene-3-indanone, whose chemical structure is analogous to the end-group moiety of the representative non-fullerene acceptor, has been prepared and applied in BTR-Cl:N3-based ASM OSCs. The intrinsic structural feature of IC-IF enables the self-assembly of N3 along with the enhanced intermixing between BTR-Cl and N3 in the subsequent thermal annealing process. This offers nano-scale phase separation with a predominant face-on oriented molecular packing in the blend film, thereby boosting the effective charge transport and extraction process in the device. Consequently, a superior power conversion efficiency (PCE) of 14.43% with an outstanding fill factor (FF) of 73.53% was achieved in the IC-FI processed device. These results indicate that the use of the volatile solid additive is a simple and practical strategy for the optimization of the small-molecule bulk-heterojunction morphology toward highly efficient ASM OSCs.
URI
https://scholarworks.unist.ac.kr/handle/201301/52558
URL
https://pubs.rsc.org/en/content/articlelanding/2021/TA/D0TA10649F#!divAbstract
DOI
10.1039/d0ta10649f
ISSN
2050-7488
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