Pyridine-triphenylamine hole transport material for inverted perovskite solar cells

Novel photoelectric material of perovskite-like (CH3)3SPbI3 nanorod arrays with high stability

“…Taking an example of adopting slightly larger FA to substitute MA, FA interaction with surrounding [PbI 6 ] 4À octahedral was stronger than that of MA, due to the increased hydrogen bonding [11]. The perovskite stability was enhanced because the protons from FA with stronger interaction than those from MA [12]. However, the black perovskite phase of FAPbI 3 is easy to transform to the yellow perovskite phase and further degrades when exposed in humidity atmosphere, where FA cation is dissociated to ammonia and symtriazine [13].…”

Recent development of pyridine based charge transporting materials for organic light-emitting diodes and perovskite solar cells

“…Recently, Lui et al reported two star shaped HTMs 80 and 81 (Chart 4) to study the effects of core structure (pyridine/phenyl unit) on dihedral angels as well as on the device performance of PSCs. 96 The theoretical calculations explained that HTM 81 shows extended π-conjugation with a decreased dihedral angle as compared to HTM 80 . The calculated dihedral angles between central pyridine ring and the adjacent benzene ring of triphenylamine in HTM 81 were −21.1°, 21.6° and −36.4°, whereas in the case of HTM 80 were −38.4°, −38.5° and −38.5°, respectively (Fig.…”

Leverage of Pyridine Isomer on Phenothiazine Core: Organic Semiconductors as Selective Layers in Perovskite Solar Cells

“…In this context, organic small molecules consisting of the pyridine (Py) unit either in the core or in the arms have been investigated as HSLs. The pyridine unit, by virtue of its being a Lewis base, can also passivate the lead ion (Pb 2+ ) defects at the surface and grain boundaries. − More importantly, it was considered as an electron-deficient unit to construct D–A-type HSLs. Up to now, the research on the pyridine derivative unit in HSLs (Figure ) could be categorized into two groups: (i) comparison of pyridine-based HSLs and counterparts with the benzene unit, for instance, YZ22 (Py) vs YZ18 (Ben), H-Pyr (Py) vs H-Ben (Ben), and PT-DC (Py) vs BP-DC (Ben); (ii) linking the topology of the core and arm, such as 2,6PyDAnCBZ with 2,6-substitution vs 3,5PyDAnCBZ with 3,5-substitution .…”