Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 35, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201802895
Keywords
fused-ring small molecules; high photo-to-current efficiency; non-fullerene acceptors; organic field-effect transistors; organic solar cells
Categories
Funding
- KAUST Solar Center Competitive Fund (CCF)
- ONR [N00141512322]
- KAUST's Center Partnership Fund [3321]
- U.S. Department of Energy [DE-AC02-05CH11231]
Ask authors/readers for more resources
N-type organic small molecules (SMs) are attracting attention in the organic electronics field, due to their easy purification procedures with high yield. However, only a few reports show SMs that perform well in both organic field-effect transistors (OFETs) and organic solar cells (OSCs). Here, the synthesis and characterization of an n-type small molecule with an indacenodithieno[3,2-b]thiophene (IDTT) core unit and linear alkylated side chain (C-16) (IDTTIC) are reported. Compared to the state-of-the-art n-type molecule IDTIC, IDTTIC exhibits smaller optical bandgap and higher absorption coefficient, which is due to the enhanced intramolecular effect. After mixing with the polymer donor PBDB-T, IDTIC-based solar cells deliver a power conversion efficiency of only 5.67%. In stark contrast, the OSC performance of IDTTIC improves significantly to 11.2%. It is found that the superior photovoltaic properties of PBDB-T:IDTTIC blends are mainly due to reduced trap-assisted recombination and enhanced molecular packing coherence length and higher domain purity when compared to IDTIC. Moreover, a significantly higher electron mobility of 0.50 cm(2) V-1 s(-1) for IDTTIC in OFET devices than for IDTIC (0.15 cm(2) V-1 s(-1)) is obtained. These superior performances in OSCs and OFETs demonstrate that SMs with extended pi-conjugation of the backbone possess a great potential for application in organic electronic devices.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available