Structural, morphological and thermodynamic parameters investigation of tunable MAPb1−xCdxBr3–2xI2x hybrid perovskite

Singh, Rajan Kumar; Sharma, Pushkal; Lu, Chung‐Hsin; Jain, Neha; Singh, Jai

doi:10.1016/j.jallcom.2021.158936

Cited by 15 publications

(8 citation statements)

References 35 publications

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“…Notably, the radius of the doped Cd ions was limited to pure bromine PeQDs. [46][47][48][49][50] The rapid degradation of the Cd-ion-doped pure bromine PeQDs was observed because of the easy loss of Cd 2+ ions upon aging. [51] To introduce cadmium ions into the perovskite lattice, CdCl 2 was used as a Cd 2+ source, and trioctylphosphine (TOP) was used to dissolve the insoluble CdCl 2 at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

Enriched‐Bromine Surface State for Stable Sky‐Blue Spectrum Perovskite QLEDs With an EQE of 14.6%

Zhu

Tong

et al. 2022

Advanced Materials

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Halogen vacancies are of great concern in blue‐emitting perovskite quantum‐dot light‐emitting diodes because they affect their efficiency and spectral shift. Here, an enriched‐bromine surface state is realized using a facile strategy that employs a PbBr2 stock solution for anion exchange based on Cd‐doped perovskite quantum dots. It is found that the doped Cd ions are expected to reduce the formation energy of halogen vacancies filled by the external bromine ions, and the excess free bromine ions in solution are enriched in the surface by anchoring with halogen vacancies as sites, accompanied with the shedding of surface long‐chain ligands during the anion exchange process, resulting in a Br‐rich and “neat” surface. Moreover, the surface state exhibits good passivation of the surface defects of the controlled perovskite QDs and simultaneously increases the exciton binding energy, leading to excellent optical properties and stability. Finally, the sky‐blue emitting perovskite quantum‐dot light‐emitting diodes (QLEDs) (490 nm) are conducted with a record external quantum efficiency of 14.6% and current efficiency of 19.9 cd A−1. Meanwhile, the electroluminescence spectra exhibit great stability with negligible shifts under a constant operating voltage from 3 to 7 V. This strategy paves the way for improving the efficiency and stability of perovskite QLEDs.

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Section: Resultsmentioning

confidence: 99%

Enriched‐Bromine Surface State for Stable Sky‐Blue Spectrum Perovskite QLEDs With an EQE of 14.6%

Zhu

Tong

et al. 2022

Advanced Materials

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“…Reproduced with permission. [ 177 ] Copyright 2021, Elsevier Ltd. c) The values of t , µ and Δ H belong to (Cs or Rb or FA) x MA 1− x [(Ca or Sr) y Sn 1− y or (Ca or Sr) y Ge 1− y ]I 2 Br perovskites. d) The band gap values of (Cs or Rb or FA) x MA 1− x [(Ca or Sr) y Sn 1− y or (Ca or Sr) y Ge 1− y ]I 1−z Br z .…”

Section: Doping Strategiesmentioning

confidence: 99%

“…Incorporation of CdI 2 strongly enhances the grain size and crystallinity (x ≤ 0.1) along with the tunable band gap. [177] The alkaline earth metal (AEM) ions such as Ca 2+ , Mg 2+, and Ba 2+ can be doped into the MAPbI 3 perovskite along with the halogen doping, which forms MAPb 1−x AEM x I 3-y Cl y (AEM = Ca 2+ , Mg 2+ , Ba 2+ ) system. [20,178,179] Doping Ca 2+ into the perovskite can reduce the bandgap and extend the absorption to visible range along with the enhanced PCE in n-i-p type structure devices.…”

Section: A-b B-x and A-b-x Sites Dopingmentioning

confidence: 99%

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Doping Strategies for Promising Organic–Inorganic Halide Perovskites

Jin

Lou

Wang

2023

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up, but their weaknesses (bad stability and low efficiency) are obvious although it is expected as a promising candidate to address the toxicity of lead. [33] There are at least four main issues to be solved: i) The poor stability due to the oxidation of Sn 2+ in a low water and oxygen environment.ii) The low formation energy of Sn vacancies. iii) The fast formation rate of perovskite leads to poor film formation quality. iv) The mismatch of energy levels between SOIHP layer and the charge transport layer results in the charge transport barrier. [34] Therefore, it is urgent to resolve these problems in the POIHPs and SOIHPs to improve their performance, promoting the commercial application of perovskites in many fields. In order to address the issues aforementioned, compositional engineering plays a key role in achieving highly efficient and stable OIHPs. Notably, the modification of properties through ion doping is an effective way to improve the performance and broaden the application field of OIHPs in recent years, [1,[35][36][37][38][39][40] involving solar cells, light-emitting diodes, transistors, and so on. [1,4,6,41] In order to better understand doping, it is important to study the structural characteristics of perovskites. There are two main kinds of perovskites 3D and 2D perovskites, which were extensively explored in recent years. The typical 3D structure can be expressed as ABX 3 , where A is an organic cation such as CH 3 NH 3 + (MA), (NH 2 ) 2 CH + (FA), and Cs + ; B is a divalent cation such as Pb 2+ and Sn 2+ (we only mentioned in this article); X is halogen anions such as Cl − , Br − , and I − , respectively. The 2D perovskites can be categorized as Ruddlesden-Popper phase (RPP) A' 2 A n-1 B n X 3n+1 with 1 ≤ n < ∞, Dion-Jacobson phase (DJP) A''A n-1 B n X 3n+1 with 1 ≤ n < ∞, and alternating cations in the interlayer phase (ACIP) A'''A n B n X 3n+1 , where the A', A'' and A''' are an organic spacer cation such as aromatic or aliphatic alkylammonium monovalent cations; diamine compounds with two amino groups forming hydrogen bonds on both ends with the inorganic "quantum wells" (bivalent cations), and guanidine (GA), respectively. [1,[42][43][44] There are also lower-dimension (LD) perovskites such as 1D and 0D. [45][46][47] The ions doping can occur at the A, B, and X sites, or simultaneously happen at these sites. The doping that we mentioned in perovskite may differ from other semiconductors where it refers to a very small concentration of element addition, while our "doping" refers to a large amount of element addition which is more like an alloy or so. With the different doping strategies, the properties of POIHP and SOIHP can be effectively controlled or modified. The relationship between the

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“…Most recently, there have been much more researches about perovskite QDs by composition engineering for wider optoelectronic applications. [68][69][70]…”

Section: Structure Of Perovskitementioning

confidence: 99%

Advances in metal halide perovskite lasers: synthetic strategies, morphology control, and lasing emission

Liu

Zhan

et al. 2021

Adv. Photon.

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In the past decade, lead halide perovskites have emerged as potential optoelectronic materials in the fields of light-emitting diode, solar cell, photodetector, and laser, due to their low-cost synthesis method, tunable bandgap, high quantum yield, large absorption, gain coefficient, and low trap-state densities. In this review, we present a comprehensive discussion of lead halide perovskite applications, with an emphasis on recent advances in synthetic strategies, morphology control, and lasing performance. In particular, the synthetic strategies of solution and vapor progress and the morphology control of perovskite nanocrystals are reviewed. Furthermore, we systematically discuss the latest development of perovskite laser with various fundamental performances, which are highly dependent on the dimension and size of nanocrystals. Finally, considering current challenges and perspectives on the development of lead halide perovskite nanocrystals, we provide an outlook on achieving high-quality lead perovskite lasers and expanding their practical applications.

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Structural, morphological and thermodynamic parameters investigation of tunable MAPb1−xCdxBr3–2xI2x hybrid perovskite

Cited by 15 publications

References 35 publications

Enriched‐Bromine Surface State for Stable Sky‐Blue Spectrum Perovskite QLEDs With an EQE of 14.6%

Enriched‐Bromine Surface State for Stable Sky‐Blue Spectrum Perovskite QLEDs With an EQE of 14.6%

Doping Strategies for Promising Organic–Inorganic Halide Perovskites

Advances in metal halide perovskite lasers: synthetic strategies, morphology control, and lasing emission

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