《D-p-D molecular semiconductors for perovskite solar cells: the superior role of helical versus planar p-linkers》 was written by Xu, Niansheng; Zheng, Aibin; Wei, Yuefang; Yuan, Yi; Zhang, Jing; Lei, Ming; Wang, Peng. Recommanded Product: Bis(4-methoxyphenyl)amine And the article was included in Chemical Science in 2020. The article conveys some information:
Controlling the mode of mol. packing and the size of mol. aggregates is of fundamental importance for high-performance charge transport materials in next-generation optoelectronic devices. To clarify the peculiar role of helicene as a kernel block in the exploration of unconventional organic semiconductors, in this work thia[5]helicene (T5H) is doubly aminated with electron-donating dimethoxydiphenylamine to afford T5H-OMeDPA, which is systematically compared with its perylothiophene (PET) congener (PET-OMeDPA). On the basis of the quantum theory of atoms in mols. and energy decomposition anal. of single crystals, it is surprisingly found that while p-p stacking of planar PET is stronger than that of helical T5H, this desirable effect for the charge transport of organic semiconductors is completely lost for donor-p-donor (D-p-D) type PET-OMeDPA but is retained for T5H-OMeDPA to a large extent. Consequently, the T5H-OMeDPA single-crystal presents about 5 times higher theor. hole-mobility than PET-OMeDPA. With respect to PET-OMeDPA, there is a weaker electronic coupling of helical T5H-OMeDPA with perovskites, leading to reduced interfacial charge recombination. Due to reduced transport resistance and enhanced recombination resistance, perovskite solar cells with T5H-OMeDPA exhibit a power conversion efficiency of 21.1%, higher than 19.8% with PET-OMeDPA and 20.6% with the spiro-OMeTAD control. In the experiment, the researchers used many compounds, for example, Bis(4-methoxyphenyl)amine(cas: 101-70-2Recommanded Product: Bis(4-methoxyphenyl)amine)
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