Effects of core moiety and substituted positions in phenothiazine-based hole transporting materials towards high thermal stability and good hole mobility. Issue 50 (14th December 2017)

• Record Type: Journal Article
• Authors: Liang, Xiaozhong; Wang, Chao; Wu, Min; Wu, Yuezhen; Zhang, Fang; Han, Zhaoxiang; Lu, Xiaoqing; Guo, Kunpeng; Zhao, Yu-Ming
• Is Part Of: Tetrahedron. Volume 73:Issue 50(2017)
• Page Start: 7115
• Page End: 7121
• Publication Date: 2017-12-14
• Subjects: Hole transporting materials -- Thermal stability -- Hole mobility -- Chemical synthesis; Chemistry, Organic -- Periodicals; 547.005
• DOI: 10.1016/j.tet.2017.11.003
• Languages: English
• ISSNs: 0040-4020

Abstract

Abstract: Two hole transporting materials (HTMs), SFX-PT1 andSFX-PT2, were designed and synthesized by combing a spiro[fluorene-9, 9′-xanthene] (SFX) core with tetra- phenothiazine substituted at the 2, 2′, 7, 7′- and 2, 3′, 6, ′7-positions, respectively. As comparison, a HTM with tetra-phenothiazine substituted at the 2, 2′, 7, 7′-positions of a 9, 9′-spirobifluorene core (Spiro-PT ) was also synthesized. Their photophysical and electrochemical properties, thermal stability and hole mobility were investigated. It was demonstrated that SFX-centered HTMs exhibited superior Stokes shift, thermal stability and hole mobility than those ofSpiro-PT . Combining with the substituted positions modification, SFX-PT1 has the largest Stokes shift of 197 nm, the highest decomposition temperature of 435 °C and hole mobility of 2.08 × 10 −3 cm 2 V −1 S −1 . Moreover, the energy levels of the HTMs were matched very well with that of CH3 NH3 PbI3 . Our results indicated that SFX-centered, phenothiazole substituted HTMs might be potential candidates for efficient perovskite solar cells. Graphical abstract: