Selenophene substitution effect on naphthalene-diimide-vinylene-based small molecules for n-type organic field-effect transistors
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초록
내용
Two naphthalene diimide (NDI)-based small molecules with the donors of thiophene-vinylene-thiophene (TVT) or selenophene-vinylene-selenophene (SVS) were newly synthesized for semiconductors of n-type organic field-effect transistors (OFETs). The results of density functional theory showed the monomeric molecular structure of N-SVS-N is tilted twice as much as that of N-TVT-N. which means that N-SVS-N has lower backbone planarity. However, the thin films of N-SVS-N showed unexpectedly more uniform surface morphology and predominantly edge-on packed structure in comparison with those of N-TVT-N. As the result, the optimally annealed OFETs with N-SVS-N exhibited electron mobilities of up to 0.016 cm2 V-1 s-1, while OFETs with N-TVT-N showed a lower electron mobilities of up to 6.6 × 10-3 cm2 V-1 s-1. These results could be explained by the structural advantages of N-SVS-N that facilitate interactions between the electron-rich selenophenes.