Carrier dynamics in two-dimensional perovskites: Dion–Jacobson <i>vs.</i> Ruddlesden–Popper thin films

Qin, Chaochao; Xu, Liuhong; Zhou, Zhongpo; Song, Jian; Ma, Shuhong; Jiao, Zhaoyong; Jiang, Yuhai

doi:10.1039/d1ta09549h

Cited by 31 publications

(41 citation statements)

References 55 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Likewise, the STE emission maxima of 8N-RP is red-shifted as compared to 8N8-DJ. Because of the difference in octahedral tilting of the DJ and RP perovskites, 40 the conduction band minima for 8N-RP have lower energy, although the valence band maxima remain similar. 41 As a result, the STE emission of 8N-RP has lower energy (λ = 600 nm) than 8N8-DJ (λ = 575 nm).…”

mentioning

confidence: 99%

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

Mandal

Roy

Mondal

et al. 2022

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

Semiconductor nanostructures with near-unity photoluminescence quantum yields (PLQYs) are imperative for light-emitting diodes and display devices. A PLQY of 99.7 ± 0.3% has been obtained by stabilizing 91% Sn2+ in the Dion–Jacobson (8N8)SnBr4 (8N8-DJ) perovskite with 1,8-diaminooctane (8N8) spacer. The PLQY is favored by a longer spacer molecule and out-of-plane octahedral tilting. The PLQY shows one-month ambient stability under high relative humidity (RH) and temperature. With n-octylamine (8N) spacer, Ruddlesden–Popper (8N)2SnBr4 (8N-RP) also shows PLQY of 91.7 ± 0.6%, but it has poor ambient stability. The 5–300 K PL experiments decipher the self-trapped excitons (STEs) where the self-trapping depth is 25.6 ± 0.4 meV below the conduction band because of strong carrier–phonon coupling. The microsecond long-lived STE dominates over the band edge (BE) peaks at lower excitation wavelengths and higher temperatures. The higher PLQY and stability of 8N8-DJ are due to the stronger interaction between SnBr6 4– octahedra and 8N8 spacer, leading to a rigid structure.

show abstract

mentioning

confidence: 99%

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

Mandal

Roy

Mondal

et al. 2022

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

show abstract

“…Whereas in the films with n = 4 and n = 8, both the formation and decay of the PIB signal were much slower. To gain an understanding of the mechanism by which this distinction arises, the formation and decay of the PIB signal were fitted by the following equation [ 36 ]

\begin{matrix} Δ A false(t false) = - A_{1} \exp false(- t / τ_{1} false) + A_{2} \exp false(- t / τ_{2} false) + A_{3} \exp false(- t / τ_{3} false) \end{matrix}

where τ 1 is the formation time constant, and τ 2 and τ 3 are the decay time constant. Through exponential fitting, we obtain three kinetic processes with significantly different time scales (see Table S1, Supporting Information for details).…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…Shifting the distribution to larger‐n quantum wells (QWs) leads to a slower transfer time. [ 36 ] The τ 3 in the kinetic profile of films with n = 8 is much larger than films with n = 4, which means that in films with n = 8, the carrier recombination rate is smaller, and the corresponding solar cell device should also exhibit better optoelectronic properties.…”

Section: Analysis and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Photo‐Induced Degradation of 2D Dion−Jacobson Perovskites under Continuous Light Illumination

et al. 2022

View full text Add to dashboard Cite

In the past decade, there has been a rapid development in perovskite solar cells, and their highest device efficiency has reached 25.7%. But their poor stability is still one of the critical factors hindering commercialization. Compared with 3D‐structured perovskites, 2D perovskites have better structural stability especially 2D Dion−Jacobson (D–J) perovskites. However, their degradation mechanism under light is not clear. Herein, the changes in the absorption spectra of D–J perovskites (PDA(FA)n−1PbnI3n−1) under continuous light illumination (100 mW cm−2) are investigated. The absorption spectra of D–J perovskites with different n values change in different degrees after two hours of continuous light illumination. It is found that the absorption intensity near the band edge of all these films has been enhanced, which indicates that some more absorbing species are produced. X‐Ray diffraction patterns confirm that the PDA(FA)n−1PbnI3n−1 2D D–J perovskite is transformed into 3D α‐FAPbI3 after illumination, and further transformed into δ‐FAPbI3 and PbI2. The proposed work contributes to understanding the degradation mechanism of 2D D–J perovskite under illumination and improving the stability of 2D D–J perovskite materials.

show abstract

“…Because there is no Van der Waals gap between the spacer cation layers in DJ phase perovskite, the transportation of carriers between inorganic layers is less impeded. Besides, the photoelectric properties of DJ phase perovskite are much better, [ 16 ] resulting in higher photoelectric conversion efficiency (PCE) for DJ phase PSCs. Up to now, there are a huge number of achievements for RP phase perovskite materials and photovoltaic devices based on pure lead component.…”

Section: Introductionmentioning

confidence: 99%

Additive Engineering for High‐Performance Two‐Dimensional Dion–Jacobson Pb–Sn Alloyed Perovskite Solar Cells

et al. 2022

View full text Add to dashboard Cite

Two‐dimensional perovskite materials attract great attentions for the application of perovskite solar cells (PSCs) due to the regulable bandgap and high stability. However, the power conversion efficiency (PCE) of 2D PSCs is far behind in that of three‐dimensional PSCs. Herein, Dion–Jacobson (DJ) phase Pb–Sn perovskite of (PhDMA)MA4(Pb0.5Sn0.5)5I16 in 2D PSCs is introduced, which has suitable bandgap of 1.27 eV and offers the candidate for the absorber of bottom device in all perovskite tandem solar cells. The nonlinear bandgap behavior of 2D Pb–Sn perovskite materials is certified by adjusting the recipe of precursors to vary the bandgap of perovskite films. Moreover, MACl is employed to improve the film quality of 2D Pb–Sn perovskite, leading to the suppression of the defect density and nonradiative recombination for 2D PSCs. As a result, a high PCE of 12.2% is achieved for DJ phase 2D Pb–Sn PSCs.

show abstract

Carrier dynamics in two-dimensional perovskites: Dion–Jacobson vs. Ruddlesden–Popper thin films

Abstract: Quasi-two dimensional perovskites have emerged as candidates of high-performance materials for various optoelectronic applications due to the unique excitonic properties in their multilayer structures. Both Dion–Jacobson perovskites and Ruddlesden-Popper phases...

Cited by 31 publications

References 55 publications

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

Spacer Switched Two-Dimensional Tin Bromide Perovskites Leading to Ambient-Stable Near-Unity Photoluminescence Quantum Yield

Photo‐Induced Degradation of 2D Dion−Jacobson Perovskites under Continuous Light Illumination

Additive Engineering for High‐Performance Two‐Dimensional Dion–Jacobson Pb–Sn Alloyed Perovskite Solar Cells

Contact Info

Product

Resources

About