Heterointerface engineering of perovskite defects and energetics for light-emitting diodes

Zhang, Xiaomeng; Shi, Lei; Bai, Junyang; Wang, Feijiu; Jiang, Maowei

doi:10.1007/s12274-022-5204-7

Cited by 9 publications

(9 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lead-based halide perovskites, represented by APbX 3 (A = MA + /FA + /Cs + , X = Cl – /Br – /I – ), have garnered significant attention due to their exceptional photoelectric properties, including high light absorption coefficients, low defect densities, and large electronic dimensions . These Pb-based perovskites have been found to have wide-ranging applications in various fields, such as solar cells, − light-emitting diodes, − and X-ray detectors. − However, the inherent drawback of lead-based perovskites lies in their poor structural stability and propensity to release lead into the environment . The toxicity associated with lead is a severe concern, as it can have detrimental effects on children’s intelligence quotient and normal development .…”

mentioning

confidence: 99%

Effective Energy Transfer Boosts Emission of Rare-Earth Double Perovskites: The Bridge Role of Sb(III) Doping

Chen

Zhang

et al. 2023

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

Halide perovskites have attracted considerable interest due to their excellent photoelectric properties. In this study, we synthesized Sb 3+ -doped Cs 2 NaTbCl 6 using a solvothermal method to investigate its tunable photoelectric properties and low toxicity. Upon Sb 3+ ion doping, the photoluminescence yield (PLQY) of Cs 2 NaTbCl 6 significantly increased from ∼1.7 to ∼47%. The introduced Sb 3+ ions with ns 2 electronic configuration expanded the rare-earth element's absorption cross section, broke intrinsic forbidden transitions, and suppressed nonradiative recombination. Additionally, the codoping of Sb 3+ and Mn 2+ facilitated efficient energy transfer, resulting in highly efficient photoluminescence. The PLQY of 1%Sb 3+ ,3%Mn 2+ :Cs 2 NaTbCl 6 reached a remarkable 85.8%, marking the highest reported value for rare-earth double perovskites in the visible light region. This study highlights the vital role of Sb(III) doping as a bridging agent to enhance the emission in rare-earth double perovskites.

show abstract

mentioning

confidence: 99%

Effective Energy Transfer Boosts Emission of Rare-Earth Double Perovskites: The Bridge Role of Sb(III) Doping

Chen

Zhang

et al. 2023

J. Phys. Chem. Lett.

View full text Add to dashboard Cite

show abstract

“…Additionally, compared to PhPOCl 2 (hydrolyzed), the deconvoluted P 2p peaks, P 2p 1/2 and P 2p 3/2 , of the PhPOCl 2 -related CsPb(Br/Cl) 3 NC thin film shift toward higher binding energies (from 134.2 to 134.4 eV and from 133.3 to 133.5 eV, respectively). It indicates the chemical interaction of PhPOCl 2 derivatives on the perovskite NC surface, likely between PO and NC surface Pb. − This picture is corroborated by FTIR measurement (see Figure S10). A strong absorption feature of the PO group at around 1271 cm –1 is observed on PhPOCl 2 (hydrolyzed), which shifts to a smaller wavenumber of 1259 cm –1 for the PhPOCl 2 -related CsPb(Br/Cl) 3 NC.…”

Section: Resultsmentioning

confidence: 99%

Controllable Anion Exchange on Perovskite Nanocrystal Solid-State Thin Films

et al. 2023

View full text Add to dashboard Cite

Colloidal mixed-halide perovskite nanocrystals (NCs) with a tunable emission color possess great potential for optoelectronic applications. However, their emission color and wavelength often change after purification and thin film deposition steps. In this work, to circumvent the emission shift issue, we report a novel method to directly tune the emission wavelength through a controllable anion exchange process on perovskite NC solid-state thin films. Specifically, it is realized by using hydrofluoroethers as the chemically benign reaction media with an organic halogen reagent. Our study also demonstrates that the phenylphosphonic halide reagent-related hydrolysis reaction is the dominant mechanism of anion exchange. Based on the diversity of the halogen reagent, our anion-exchange approach shows good universality. Finally, as a proof of concept, colorful RGB light-emitting diodes (LEDs) are fabricated, which shows the promising potential of our controllable anion-exchange strategy on perovskite NC solid-state thin films and the compatibility with optoelectronic device applications.

show abstract

“…Usually, a high CPD value means a low WF of the films, which suggests that the SPA incorporation can effectively reduce the WF value of SnO 2 . [63][64][65][66] The corresponding energy level diagram Figure 3k show that the conduction band minimum of SnO 2 -SPA ETLs is closer to perovskite than that of SnO 2 ETLs, the energy level offset (ΔE) between perovskite and ETLs decreases from 0.12 to 0.02 eV, which may facilitate the electron injection and transport at the bottom interface. In addition, the corresponding larger value of ΔE of the valence band maximum is able to effectively block holes, thus reducing the reverse recombination.…”

Section: Resultsmentioning

confidence: 99%

A Chelating‐Agent‐Passivated Electron Transport Layer for Efficient Perovskite Solar Cells with Enhanced Reproducibility

Wang,

Dai,

Meng

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Substandard printing quality of electron transport layers (ETLs) always leads to non‐ideal nucleation crystallization and bottom interface contact of the perovskite, followed by the formation of poor‐quality perovskite films with severe heterogeneity, which is the major source of non‐radiative recombination loss and environmental sensitivity of perovskite solar cells (PVSCs). These often result in serious photovoltaic performance loss, significant instability, and negative fabrication reproducibility. Herein, sodium phytate is proposed as a chelating agent for passivating the tin oxide (SnO2) ETLs to enable the stabilization of SnO2 nanoparticles and facilitate the printing of pinhole‐free films, thereby realizing the controlled nucleation crystallization in perovskite precursor. Thus, the printed PVSCs exhibit a champion power conversion efficiency up to 23.77% with negligible hysteresis effect. The unencapsulated devices demonstrate outstanding long‐term stability, which maintains over 80% of their initial efficiency under exposure to atmospheric environment (50% relative humidity) for 1500 hours, and a consistent and centralized distribution of efficiencies across all seasons, indicating their good reproducibility in diverse climatic atmospheres.

show abstract

Heterointerface engineering of perovskite defects and energetics for light-emitting diodes

Cited by 9 publications

References 57 publications

Effective Energy Transfer Boosts Emission of Rare-Earth Double Perovskites: The Bridge Role of Sb(III) Doping

Effective Energy Transfer Boosts Emission of Rare-Earth Double Perovskites: The Bridge Role of Sb(III) Doping

Controllable Anion Exchange on Perovskite Nanocrystal Solid-State Thin Films

A Chelating‐Agent‐Passivated Electron Transport Layer for Efficient Perovskite Solar Cells with Enhanced Reproducibility

Contact Info

Product

Resources

About