期刊
JOURNAL OF POWER SOURCES
卷 425, 期 -, 页码 87-93出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.03.050
关键词
Perovskite solar cells; Facile synthesis; Hole-transporting material; Naphthalene derivatives
资金
- Natural Science Foundation of Anhui Province [1908085QB56]
- Fundamental Research Funds for the Central Universities [JZ2018HGBZ0176]
- Postdoctoral Science Foundation of China [2018M642548]
- Talent Project of Hefei University of Technology [75010-037004, 75010-037003]
- National Natural Science Foundation of China [51602089, 51472071]
Massive efforts are devoted to exploring alternative hole-transporting materials for efficient and stable perovskite solar cells. As one typical polycyclic aromatic hydrocarbon, naphthalene group endows a favorable planar conformation and further extended pi-conjugation, both of which accelerate the process of hole extraction and transport. In this work, two small molecule hole-transporting materials based on naphthalene core and arylamine terminal groups, termed NH-2,6 and NH-2,7, are prepared via facile synthesis from commercial precursors with a low synthetic cost. NH-2,6, which incorporates particular 2,6-substituted naphthalene core and arylamine terminal, exhibits a deeper highest occupied molecular orbital and a higher hole mobility ascribing to the discriminating structural substitution position effect and better electronic delocalization extent between naphthalene core and arylamine terminal. Thus with NH-2,6, impressive efficiency of 18.7%, which is associated with excellent reproducibility and reasonable stability, is afforded based on the optimized mixed cation perovskite solar cells. These results not only highlights that the properties of hole-transporting materials can be tuned to some extent through the substitution position effect, but also provides the significative insights into the molecule design for facile synthesis, low-cost and efficient hole-transporting materials.
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