期刊
ELECTROCHIMICA ACTA
卷 299, 期 -, 页码 518-530出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.01.008
关键词
Dye-sensitized solar cells; Supramolecular sensitizer; Nitrogen-rich heterocycle donor; Hydrogen bond; Co-sensitization
资金
- National Natural Science Foundation of China [61704133, 21673134, 51773112]
- Natural Science Foundation of Shaanxi Province [2018JM6087, 2017JM2030]
- President's Key Foundation of Xi'an Technological University [XAGDXJJ16001]
- Provincial Key Laboratory Foundation of Education Department of Shaanxi Province [16JS043]
Two nitrogen-rich heterocycle donor dyes, NP-2 and NP-3, have been strategically designed and synthesized to construct functionalized self-assembly layers. Through the formation of N...H hydrogen bonds between these nitrogen-rich heterocycle donors and 4-tert-butylbenzoic acid (PTBBA), the electron leak points (imine group (-N=)) may be plugged, thus blocking excited-state electron lateral transferring between the adsorbed dyes and electron leaking from electron-transporting channel into the electrolyte. Furthermore, the huge 3-dimensional sizes of such supramolecule sensitizers can not only suppress dye aggregation, but enhance the photoresponse capacity in visible region. Therefore, the devices based on NP-2@PTBBA and NP-3@PTBBA, which obtained by the cocktail sensitization procedures, can be improved by increasing the open-circuit photovoltage (V-oc) without any loss of the shortcircuit photocurrent density (J(sc)) owing to the synergy effect between self-assembly and co-sensitization. Although the device based on NP-3/PTBBA via the stepwise sensitization procedure delivers lower efficiency, it can remain at 103.14% of the initial efficiency as a result of parallel increase in J(sc) and V-oc values. Overall, the design principles provide a clear road map of supramolecular dye-sensitized solar cells (SDSSCs) and demonstrate the potential of 1,3,5-triazine-based dyes in solar cells research. (C) 2019 Elsevier Ltd. All rights reserved.
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