Top Thermal Annealing of 2D/3D Lead Halide Perovskites: Anisotropic Photoconductivity and Vertical Gradient of Dimensionality

Shimono, Rei; Nishikubo, Ryosuke; Ishiwari, Fumitaka; Saeki, Akinori

doi:10.2494/photopolymer.34.263

Cited by 3 publications

(1 citation statement)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure a presents a 2D-GIXRD image of the RP perovskite film without the inclusion of an additive, which comprises prominent (111) and (202) peaks in the OOP direction (scattering vector, q = 10.3 and 20.3 nm –1 , respectively). ,, The spots of these peaks are narrower than those of RP perovskite films prepared on mesoporous TiO 2 using a dimethyl sulfoxide (DMSO) solution with CB anti-solvent treatment, although they overlapped with the (110) and (220) peaks of 3D MAPbI 3 perovskite . Thus, the fast-evaporating DMF and flat PEDOT:PSS layer commonly used in 2D PSCs would merit the crystallographic alignment.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ammonium and Alkali Metal Additives on Anisotropic Photoconductivities and Solar Cell Efficiencies of Two-Dimensional Lead Halide Perovskites

et al. 2022

Self Cite

View full text Add to dashboard Cite

To address the issue of instability and surface defects in three-dimensional lead halide perovskite solar cells (PSCs), two-dimensional (2D) pseudo-(quasi) perovskites, such as Ruddlesden–Popper (RP) and Dion–Jacobson (DJ) perovskites, have garnered significant attention. Controlling the orientation of their layered crystallites is key to vertical charge transport in 2D PSCs; however, their detailed electronic properties are yet to be fully understood. Herein, we investigated the effect of processing additives (ammonium salts: NH4Cl, NH4Br, NH4Cl, NH4SCN, and CH3NH3SCN with/without alkali metal salts (NaCl, KCl, RbCl, and CsCl) in water) on the crystallographic nature and anisotropic microwave photoconductivity of RP and DJ perovskites. Importantly, a strong correlation (correlation coefficient, r = 0.882) was observed between the power conversion efficiencies (1–11%) of inverted PSCs and anisotropic (both out-of-plane and in-plane to the substrate) photoconductivities for the 34 compositions of additives analyzed herein. In contrast, the one-dimensional photoconductivity and crystallographic degree of orientation exhibited significantly weaker correlations. These results underscore the importance of anisotropic mobility in 2D PSCs and could serve as guidelines for their further development.

show abstract