Diphenylamino-substituted derivatives of 9-phenylcarbazole as glass-forming hole-transporting materials for solid state dye sensitized solar cells

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• 作者：Ausra Tomkeviciene^a ; ^b ; Gabija Puckyte^a ; Juozas Vidas Grazulevicius^a ; ^{Juozas.Grazulevicius@ktu.lt} ; Martial Degbia^c ; Francois Tran-Van^c ; ^{francois.tran@univ-tours.fr} ; Bruno Schmaltz^c ; Vygintas Jankauskas^d ; Johann Bouclé ; ^e
• 关键词：Phenylcarbazole ; Dimethoxydiphenylamine ; Glass transition ; Ionization energy ; Hole drift mobility ; Solid-state dye sensitized solar cells
• 刊名：Synthetic Metals
• 出版年：2012
• 出版时间：December, 2012
• 年：2012
• 卷：162
• 期：23
• 页码：1997-2004
• 全文大小：469 K

文摘

The synthesis and properties of glass-forming diphenylamino-substituted derivatives of 9-phenylcarbazole with methoxy groups in the different position of diphenylamino moieties are reported. A comparative study on their thermal, optical, photoelectrical and electrochemical properties is presented. The synthesized compounds exhibit high thermal stability with 5 % weight loss temperatures ranging from 344 to 475 ¡ãC. The derivatives absorb electromagnetic irradiation in the range of 225-425 nm with the band gaps of 2.94-3.08 eV. The ionization energies of the synthesized compounds range from 5.04 to 5.56 eV. The lowest ionization energies and band gaps are observed for compounds containing para methoxy-substituted phenyl rings of diphenylamino moieties and for disubstituted carbazole derivatives. Charge-transporting properties of the selected compounds were tested by time-of-flight technique. Hole drift mobilities in the amorphous layers of the materials reach 10^?3 cm²/V s at high electric fields. The derivatives were tested as hole transport materials in solid-state dye sensitized solar cells and showed conversion efficiency up to 0.54 % .