title: Observation of phase-retention behavior of the HC(NH2)2PbI3 black perovskite polymorph upon mesoporous TiO2 scaffolds.
abstract: The α→δ phase transition, which occurs favorably in planar films of a black α-HC(NH2)2PbI3 (α-FAPbI3) perovskite in the amibent, is retarded when α-FAPbI3 is deposited upon mesoporous TiO2 scaffolds. It is hypothesized that this is due to the synergistic effect of the partial encapsulation of α-FAPbI3 by the mesoporous TiO2 and the elevated activation energy for the transition reaction associated with the substantial increase of the TiO2/α-FAPbI3 interfacial area in the mesoscopic system.
authors.affiliation: School of Engineering, Brown University, Providence, RI 02912, USA. yuanyuan_zhou@brown.edu nitin_padture@brown.edu.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Joonsuh
authors.initials: J
authors.lastname: Kwun
authors.forename: Hector F
authors.initials: HF
authors.lastname: Garces
authors.forename: Shuping
authors.initials: S
authors.lastname: Pang
authors.forename: Nitin P
authors.initials: NP
authors.lastname: Padture