5 years ago

Molecular Engineering of Simple Benzene–Arylamine Hole-Transporting Materials for Perovskite Solar Cells

Molecular Engineering of Simple Benzene–Arylamine Hole-Transporting Materials for Perovskite Solar Cells
Ting Yu, Shengli Jin, Jian Chen, Wangchao Chen, Fantai Kong, Hongxia Wang, Xuepeng Liu, Songyuan Dai, Zhan’ao Tan, Tasawar Hayat, Ahmed Alsaedi
Three benzene–arylamine hole-transporting materials (HTMs) with different numbers of terminal groups were prepared. It is noted that the molecule with three arms (H-Tri) shows a lower highest occupied molecular orbital level and a better film morphology on perovskite layer than the molecules with two or four arms (H-Di, H-Tetra). When these molecules were applied to the perovskite solar cells, the H-Tri-based one showed better performance compared with the H-Di- or H-Tetra-based ones. Photoluminescence and impedance spectroscopy demonstrate that H-Tri can improve the hole–electron separation efficiency and decrease the charge recombination, thus leading to a better performance. Moreover, the H-Tri-based device shows a comparable performance and a much less materials cost than the conventional spiro-OMeTAD. Therefore, we have presented a new low-cost and high-performance HTM through simple molecular engineering.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b06193

DOI: 10.1021/acsami.7b06193

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