Journal
CHEMSUSCHEM
Volume 14, Issue 17, Pages 3535-3543Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202100860
Keywords
crystalline donor; organic solar cells; photovoltaics; power conversion efficiency; side chain engineering
Funding
- Swedish Research Council [2015-04853, 2016-06146, 2019-04683]
- Swedish Research Council Formas
- Knut and Alice Wallenberg Foundation [2017.0186, 2016.0059]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2020-skllmd-07]
- China Postdoctoral Science Foundation [2020M673054]
- Postdoctoral Fund of Jinan University
- National Natural Science Foundation of China [22005121]
- NSFC [61774077]
- Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province [2019B1515120073, 2019B090921002]
- Guangdong Science and Technology Research Foundation [2020A1414010036]
- Guangzhou Key laboratory of Vacuum Coating Technologies and New Energy Materials Open Projects Fund [KFVE20200006]
- Science and Technology Program of Shanxi Province [2019JQ-244]
- National Natural Science Foundation of China (NSFC) [51773142, 51973146]
- Jiangsu Provincial Natural Science Foundation [BK20190099]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Swedish Research Council [2015-04853] Funding Source: Swedish Research Council
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A novel small molecule donor FYSM-SiCl was designed and synthesized with trialkylsilyl and chlorine substitutions, exhibiting high open-circuit voltage and high short-circuit current density in all-small-molecule organic solar cells. The introduction of side-chain engineering strategy led to improved efficiency and promising potential for efficient small molecule donors.
How to simultaneously achieve both high open-circuit voltage (V-oc) and high short-circuit current density (J(sc)) is a big challenge for realising high power conversion efficiency (PCE) in all-small-molecule organic solar cells (all-SM OSCs). Herein, a novel small molecule (SM)-donor, namely FYSM-SiCl, with trialkylsilyl and chlorine substitutions was designed and synthesized. Compared to the original SM-donor FYSM-H, FYSM-Si with trialkylsilyl substitution showed a decreased crystallinity and lower highest occupied molecular orbital (HOMO) level, while FYSM-SiCl had an improved crystallinity, more ordered packing arrangement, significantly lower HOMO level, and predominant face-on orientation. Matched with a SM-acceptor Y6, the FYSM-SiCl-based all-SM OSCs exhibited both high V-oc of 0.85 V and high J(sc) of 23.7 mA cm(-2), which is rare for all-SM OSCs and could be attributed to the low HOMO level of FYSM-SiCl donor and the delicate balance between high crystallinity and suitable blend morphology. As a result, FYSM-SiCl achieved a high PCE of 13.4 % in all-SM OSCs, which was much higher than those of the FYSM-H- (10.9 %) and FYSM-Si-based devices (12.2 %). This work demonstrated a promising method for the design of efficient SM-donors by a side-chain engineering strategy via the introduction of trialkylsilyl and chlorine substitutions.
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