Organic intercalation engineering of quasi-2D Dion–Jacobson α-CsPbI₃ perovskites

Abstract

Organic intercalation engineering of perovskites endows the as-constructed quasi-2D Dion–Jacobson α-CsPbI3 with a linearly aligned bandgap and fundamentally enhanced stability.

2D layered perovskite containing functionalised benzothieno-benzothiophene molecules: formation, degradation, optical properties and photoconductivity

“…1,2 The potential of incorporating functional organic molecules into 2D layered hybrid perovskites is currently being realized. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] In this regard, oligothiophene derivatives have recently received a lot of attention as organic cations with tunable energy levels. 12,13,16,18 We present here a 2D layered hybrid perovskite containing functionalised benzothieno [3,2-b]benzothiophene (BTBT) molecules in the organic layer.…”

Structurally Tunable Two-Dimensional Layered Perovskites: From Confinement and Enhanced Charge Transport to Prolonged Hot Carrier Cooling Dynamics

“… 21 , 29 , 36 , 65 DJ perovskite phases are distinguished from RP perovskite phases by having a divalent organic spacer cation (L′), smaller interlayer spacing, lower bandgap energies, and an undisplaced inorganic layer stacking with a general formula of L′A n –1 M n X 3 n +1 ( Figure 1 e). 66 − 73 …”

“… 69 This is in agreement with recent DFT calculation on ethylenediamine cation (EDE)-based 2D DJ perovskites, whereby n ≥ 3 samples offered enhanced stability, smaller effective masses, larger dielectric constants, and lower E b in comparison to their conventional 3D counterpart. 73 In fact, E b of (EDA)Cs n –1 Pb n I 3 n +1 perovskites ( n ≥ 3) falls between 29 and 46 meV, and their enhanced stability is related to the strong I–H interaction of diamine cations with a shortened interlayer distance of ∼3.5 Å. 73 These studies emphasize the active role played by the organic cation spacer in controlling the properties of 2D perovskites and highlight DJ perovskites as unique alternatives for improved charge carrier separation and stability.…”

“… 73 In fact, E b of (EDA)Cs n –1 Pb n I 3 n +1 perovskites ( n ≥ 3) falls between 29 and 46 meV, and their enhanced stability is related to the strong I–H interaction of diamine cations with a shortened interlayer distance of ∼3.5 Å. 73 These studies emphasize the active role played by the organic cation spacer in controlling the properties of 2D perovskites and highlight DJ perovskites as unique alternatives for improved charge carrier separation and stability.…”

Highly UV Resistant Inch‐Scale Hybrid Perovskite Quantum Dot Papers

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] However, PQDs can be susceptible to degradation under H 2 O and O 2 -rich environment, continuous irradiation condition, or even in polar solvent due to their intrinsically unstable properties. [18][19][20][21][22][23][24][25][26][27][28][29] In order to solve the problem, strategies have been provided including the adoption of alkyl ammonium with dozen-nanometer chains and the most commonly used mixture of carboxylic acid (such as oleic acid (OA)) and alkylamines (such as oleylamine (OLA)) and alkylamines (such as oleylamine, OLA) in the perovskite precursor for stabilizing the PQDs in colloidal form. [9,10] In 2016, solid-state PQDs were stabilized via surface protection of polyhedral oligomeric silsesquioxane to exhibit water-resistant behavior.…”