期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 10, 页码 12322-12330出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c01606
关键词
hole transporting materials; fused tetraphenylethylene; 9,9 '-bifluorenylidene; dibenzo[g,p]chrysene; substitution position; perovskite solar cells
资金
- National Key R&D Program of China [2019YFB1503200]
- 111 Project [B16016]
- National Natural Science Foundation of China [61904053, 51702096, U1705256, 51961165106]
- Fundamental Research Funds for the Central Universities [2019MS026, 2019MS027, 2020MS080]
The study found that HTMs with fused tetraphenylethylene cores and meta-substitution have better performance compared to other HTMs, especially in perovskite solar cells.
A series of hole transporting materials (HTMs) with fused tetraphenylethylene cores (9,9'-bifluorenylidene and dibenzo[g,p]-chrysene) as well as different substitution positions of arylamine side arms has been designed and synthesized. A reference HTM with a nonfused tetraphenylethylene core is also prepared for a comparative study. It is noted that fused tetraphenylethylene molecules show a bathochromic spectral shift, electronegative character, and lower reorganization energies than the non-fused ones. Furthermore, the molecules with side arms located on the meta-position on the tetraphenylethylene core in terms of a double bond exhibit a deeper highest occupied molecular orbital level than those of the para-position-based ones whether tetraphenylethylene is fused or not. Moreover, the reorganization energies of fused meta-position-based HTMs are lower than those of para-position-based HTMs. Fused tetraphenylethylene HTMs own a better hole-extraction capability than the non-fused ones. When used in perovskite solar cells, all devices with fused tetraphenylethylene HTMs display better performance than those of the non-fused ones. The HTMs based on dibenzo[g,p]chrysene exhibit better performance than those of bifluorenylidene. Moreover, the devices with HTMs with side arms located on the meta-position on the tetraphenylethylene core display higher power conversion efficiency than those of the para-position-based ones. The results give some new insight and reference to develop ideal HTMs for perovskite solar cells.
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