期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 7, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202108289
关键词
charge transport; electrical conductivity; molecular packing; N-doping; organic semiconductors
类别
资金
- Natural Science Foundation of China [21971014, 21672023]
- National Key Research and Development Program of China [2018YFA0901800]
- BIT Teli Young Fellow Recruitment Program
- National Natural Science Foundation of China [22075001]
Three n-type small-molecule organic semiconductors with different end functional groups were synthesized in this study. The results suggest that high intrinsic charge carrier mobility and high doping level cannot guarantee high electrical conductivity, and maintaining good charge transport pathways after doping is also critical.
Doped small molecules with high electrical conductivity are desired because they typically show a larger Seebeck coefficient and lower thermal conductivity than their polymer counterparts. However, compared with conjugated polymers, only a few small molecules can show high electrical conductivities. In this study, three n-type small-molecule organic semiconductors with different end functional groups are synthesized to explore the reasons for the low electrical conductivity issue in n-doped small-molecule semiconductors. Charge carrier mobility and doping level are usually considered as two major parameters for achieving high electrical conductivity. TDPP-ThIC with high electron mobility of 0.77 cm(2) V-1 s(-1) and high electron affinity, which can be easily n-doped; however, it only displays an electrical conductivity approximate to 10(-3) S cm(-1). To explore the reasons, the single crystal structure of TDPP-ThIC and the grazing incidence wide-angle X-ray scattering of its n-doped films are carefully analyzed. TDPP-ThIC with a 1D column packing is disclosed and easily distorted by the enthetic n-dopants, which damages the charge transport pathways, and thereby results in low electrical conductivity. The results suggests that only high intrinsic charge carrier mobility and high doping level cannot guarantee high electrical conductivity, and keeping good charge transport pathways after doping is also critical.
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