Progress and perspective in Dion-Jacobson phase 2D layered perovskite optoelectronic applications

Strategies to Enhance Light Emission from Two-Dimensional Perovskite Light-Emitting Diodes: Challenges and Future Opportunities

“…The insertion of diamine molecules can suppress the van der Waals gap between adjacent inorganic lead halide slabs that leads to a comparatively efficient charge transfer in perovskite devices. 67,103 The substandard optical performance of quasi 2D emitters in pure blue and red spectral regions is one of the primary concerns for the utilization of quasi 2D perovskites in color and display technologies. 44,104 The ion migration-induced spectral instability, inefficient carrier injection, inevitable phase impurity, poor color purity, and low PLQY are a few of the many reasons that create hindrance for the realization of highefficiency blue/red emitters.…”

“…In comparison to a monovalent organic cation bearing RP phase perovskites, the divalent organic spacers in D-J phase perovskite provide the enhanced binding energy between inorganic perovskite interlayers and result in the prolonged lifetime of PeLEDs. Because of the excellent thermal stability of D-J phase perovskites comparatively higher annealing temperatures can be applied to optimize their phase distribution. − Nagai and co-workers have demonstrated the red-light-emitting diodes based on 1,4-butanediamine organic spacer having an EQE of 16.4% with an exceptional operational lifetime of 189.4 h. They optimized the phase distribution and crystallization of n = 5 phase perovskite thin films by using a relatively high annealing temperature of 140 °C . Qin et al have used the mixture of two different divalent spacers 1,6-hexanediammonium (HDA) and 1,10-decanediammnoium (DDA) to fabricate green PeLEDs with EQE approaching 12.85% with an operational lifetime of 70 min.…”

Metal Halide Perovskites for Red‐Emission Light‐Emitting Diodes

“…The dielectric constant difference between A′ barrier layers and [BX 6 ] 4− octahedral units imparts large dielectric confinement to the quasi‐2D perovskites. [ 21 ] Due to the strong dielectric and size restrictions, quasi‐2D with lower n values exhibit stronger exciton binding energy ( E b ). [ 22 ] In general, adjusting the thickness of the quantum well can adjust the perovskites’ E b .…”

Layered Dion–Jacobson-Type Chalcogenide Perovskite CsLaM2X7 (M = Ta/Nb; X = S/Se) with a Narrow Band Gap of ∼1 eV as a Promising Rear Cell for All-Perovskite Tandem Solar Cells

“…Generally, perovskites can be classified into six types: the 113-type AMX 3 ; the 100-type including the Ruddlesden–Popper (RP)-type A′ 2 [A n –1 M n X 3 n +1 ] and the Dion–Jacobson (DJ)-type A′[A n –1 M n X 3 n +1 ]; the 110-type A n M n X 3 n +2 ; the 111-type A′ 2 A n –1 M n X 3 n +3 ; and the Aurivillius (AV)-type A′ 2 X 2 [A n –1 M n X 3 n +1 ]. , In addition to the 113-type AMX 3 , DJ- and RP-type perovskites are commonly used in photovoltaic devices. The RP-type perovskite was first reported with a PCE of 4.73% in 2014, and it increased to 18.24% within 6 years, whereas the DJ phase showed a steep PCE rise from 7.32 to 17.9% within only 1 year . Specifically, among 2D perovskites, the mixed lead/tin-based 2D DJ perovskites deliver a champion PCE of 20.09% because of their enhanced stability and superior interlayer charge-transport capacity .…”

“…The RP-type perovskite was first reported with a PCE of 4.73% in 2014, and it increased to 18.24% within 6 years, whereas the DJ phase showed a steep PCE rise from 7.32 to 17.9% within only 1 year. 26 Specifically, among 2D perovskites, the mixed lead/tin-based 2D DJ perovskites deliver a champion PCE of 20.09% because of their enhanced stability and superior interlayer charge-transport capacity. 27 Therefore, DJ perovskites are highly desirable for solar cell devices.…”