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    N-Annulated perylene substituted zinc–porphyrins with different linking modes and electron acceptors for dye sensitized solar cells

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    Type
    Article
    Authors
    Luo, Jie
    Zhang, Jing
    Huang, Kuo-Wei cc
    Qi, Qingbiao
    Dong, Shaoqiang
    Zhang, Jie
    Wang, Peng cc
    Wu, Jishan
    KAUST Department
    Chemical Science Program
    Homogeneous Catalysis Laboratory (HCL)
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Date
    2016
    Permanent link to this record
    http://hdl.handle.net/10754/621703
    
    Metadata
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    Abstract
    Three new N-annulated perylene (NP) substituted porphyrin dyes WW-7-WW-9 with different linking modes and accepting groups were synthesized and applied in Co(ii)/(iii) based dye sensitized solar cells (DSCs). The bay-linked porphyrins WW-7 and WW-8 exhibited moderate power conversion efficiency (PCE = 4.4% and 4.8%, respectively), while the peri-linked porphyrin dye WW-9 showed a PCE up to 9.2% which is slightly lower than that of our reference dye WW-6. Detailed physical measurements (optical and electrochemical), DFT calculations, and photovoltaic characterizations were performed to understand how the structural changes affect their light-harvesting ability, molecular orbital profile, energy level alignment, and eventually the photovoltaic performance. It turned out that the lower efficiencies of the cells based on WW-7 and WW-8 could be ascribed to the weak π-conjugation between the bay-substituted NP and phenylethynyl substituted porphyrin unit. The introduction of a benzothiadiazole acceptor at the anchoring group has induced a significant red shift of the IPCE action spectra of WW-8 and WW-9, by about 90 nm and 50 nm as compared to that of WW-7 and WW-6, respectively. However, less efficient electron injection was observed. Our studies gave some insight into the important role of electronic interactions between different components when one designs a dye for high-efficiency DSCs. © The Royal Society of Chemistry 2016.
    Citation
    Luo J, Zhang J, Huang K-W, Qi Q, Dong S, et al. (2016) N-Annulated perylene substituted zinc–porphyrins with different linking modes and electron acceptors for dye sensitized solar cells. J Mater Chem A 4: 8428–8434. Available: http://dx.doi.org/10.1039/c6ta02509a.
    Sponsors
    J. W. and J. Z. acknowledge financial support from A*STAR-DST joint grant (IMRE/14-2C0239). J. Z. and P. W. thank the National Science Foundation of China (No. 91233206) and the National 973 Program (2015CB932204) for financial support.
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    J. Mater. Chem. A
    DOI
    10.1039/c6ta02509a
    Additional Links
    http://pubs.rsc.org/en/content/articlehtml/2016/ta/c6ta02509a
    ae974a485f413a2113503eed53cd6c53
    10.1039/c6ta02509a
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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