CH<sub>3</sub>NH<sub>3</sub>Br Additive for Enhanced Photovoltaic Performance and Air Stability of Planar Perovskite Solar Cells prepared by Two‐Step Dipping Method

Zhang, Lei; Zhang, Xuezhen; Xu, Xiaoxia; Tang, Jie; Wu, Jihuai; Lan, Zhang

doi:10.1002/ente.201700561

Cited by 19 publications

(6 citation statements)

References 46 publications

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“…A chemical additive or photoactivation fills these anion vacancies. In the former case, halide ions from halogen gases, [ 8 ] halogen compounds AX [ 9 ] ( A = MA/FA/Cs/Na/K and X = Cl/Br/I), organic pseudohalides, [ 10 ] or ligands [ 11 ] fill the vacancies. In the latter case, the so‐called light soaking effect, molecules like oxygen improve the PL of LHPs by photoinduced defect passivation.…”

Section: Introductionmentioning

confidence: 99%

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Okamoto

Shahjahan

Biju

2021

Advanced Optical Materials

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halide vacancies/ions is an important factor in the excitonic and charge carrier properties of perovskites. [4g,h] For example, the hole trap-mediated nonradiative charge recombination in CH 3 NH 3 PbI 3 is correlated with the oxidation state of the iodine vacancy. [4h] While an I V − vacancy does not create a hole trap state, a neutral I V vacancy forms a hole trap near the conduction band and accelerates nonradiative charge recombination. Similarly, an I V + vacancy accelerates nonradiative charge recombination by forming shallow and deep hole traps. Like I vacancies, Cl or Br vacancies with different oxidation states form shallow and deep traps and influence the nonradiative exciton/charge carrier recombination rate. A chemical additive or photoactivation fills these anion vacancies. In the former case, halide ions from halogen gases, [8] halogen compounds AX [9] (A = MA/FA/Cs/Na/K and X = Cl/Br/I), organic pseudohalides, [10] or ligands [11] fill the vacancies. In the latter case, the so-called light soaking effect, molecules like oxygen improve the PL of LHPs by photoinduced defect passivation. [6c,d,12] For example, a superoxide generated by self-sensitization occupies the halide vacancy and improves the optical properties of LHPs. [6c,f ] Also, an oxide layer (e.g., PbO) on the LHP surface increases the sample stability against humidity and decreases the trap-assisted nonradiative recombination rate. [6e] Defect passivation during photoexcitation involves lattice expansion and compositional redistribution through ion migration. [12a,b,h] Crystal shapes and optical properties are equally important for the electro-optical applications of LHPs. [3a,13] Information about the LHP crystal shape-dependent halide vacancy filling by a halide precursor or the light can help optimize the properties and applications of LHPs. Nevertheless, a correlation among the structure, shape, size, defects, and degradation rate of perovskites remains concealed.We report the surface-to-volume (s-t-v) ratio-dependent PL stability, halide vacancy filling, and carrier recombination rates in methylammonium lead bromide (MAPbBr 3 ) single crystals with the cubic, plate, or rod shape. The Br − vacancies are filled by soaking the crystals in a MABr solution or a picosecond laser beam. We discuss the s-t-v ratio-dependent kinetics of Br − vacancy filling from the viewpoint of redistribution in the radiative and nonradiative recombination rates. Results and DiscussionTo understand the shape-dependent halide vacancy filling, we synthesized MAPbBr 3 microrods, microplates, and microcubes.Halide perovskites show high photoluminescence quantum yields and tunable bandgap. While perovskites' optical properties significantly degrade due to the ionic and electronic defects, a correlation among their structure, size, defects, and degradation rate remains concealed. The authors report the crystal shape-and halide vacancy-dependent stability of methylammonium lead bromide single crystals. The vacancies are filled in the cubic-, plate-, and r...

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Section: Introductionmentioning

confidence: 99%

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Okamoto

Shahjahan

Biju

2021

Advanced Optical Materials

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“…The time-resolved PL (TRPL) spectra of the corresponding films are shown in Figure c. The parameters sorted by exponential fitting are listed in Table S1 (Supporting Information). , Compared with the carrier lifetime of the CsPbIBr 2 film (∼0.94 ns), the CsPbIBr 2 /QS film shows a longer carrier lifetime of 2.40 ns. The results of the enhanced PL intensity and PL decay lifetime show that QS passivation can effectively promote charge extraction at the interface and reduce the nonradiative recombination of photogenerated carriers in the CsPbIBr 2 /QS film. , …”

Section: Resultsmentioning

confidence: 99%

Carbon-Based Stable CsPbIBr₂ Solar Cells with Efficiency of over 10% from Bifunctional Quinoline Sulfate Modification

Wang

Liu

et al. 2021

ACS Appl. Energy Mater.

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The mixed-halide CsPbIBr 2 all-inorganic perovskite solar cells (PSCs) have attracted widespread attention in view of their excellent stability and suitable band gap. However, the inherent high traps in perovskite films lead to serious nonradiative recombination and limit their future development. In this study, a passivation strategy is proposed to prepare CsPbIBr 2 PSC with high efficiency, excellent long-term stability, and low hysteresis, which uses the in situ formed PbSO 4 protective layer and the passivation of undercoordinated Pb 2+ defects by introducing quinoline sulfate (QS). Due to the effective passivation, the QS-passivated CsPbIBr 2 film with a larger grain size exhibits a better humidity resistance compared with the control one. The champion power conversion efficiency (PCE) of the carbon-based PSC without a hole transporter reaches 10.41% with an open-circuit voltage (V OC ) of 1.298 V. Especially, it can retain over 98% of the primeval PCE after nearly 1000 h of aging in the ambient atmosphere. Therefore, our work may promote the application of all-inorganic PSC in commercial development.

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“…Here, we introduce a two-step method to fabricate FAPbBr 3 on a SnO 2 electron transport layer. By adding methylammonium bromide (MABr) in the precursor solution, we found that the quality of the perovskite film is improved, and it can also help us to improve the deficiency of Br, making the Br/Pb ratio closer to three in the perovskite film. Methylammonium chloride (MACl) has been reported to enable growth of high-quality perovskite films based on FAPbI 3 .…”

Section: Introductionmentioning

confidence: 99%

Flexible Lead Bromide Perovskite Solar Cells

Liu

Kim

et al. 2020

ACS Appl. Energy Mater.

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Lead bromide perovskite solar cells (PSCs) have attracted increasing interest partly because of the high open-circuit voltage that has been obtained. Here, we present a simple way to prepare PSCs based on formamidinium lead tribromide, FAPbBr 3 , by adding methylammonium chloride and methylammonium bromide into the precursor solution. With this method, highquality and pin-hole free perovskite films with large crystal sizes were prepared. These additives result in a power conversion efficiency (PCE) of 7.9%, almost free of hysteresis, for a device on a rigid glass substrate. The first flexible lead bromide PSC is also prepared in this work and the flexible PSC exhibited a high PCE of 5.0%.

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CH₃NH₃Br Additive for Enhanced Photovoltaic Performance and Air Stability of Planar Perovskite Solar Cells prepared by Two‐Step Dipping Method

Cited by 19 publications

References 46 publications

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Carbon-Based Stable CsPbIBr₂ Solar Cells with Efficiency of over 10% from Bifunctional Quinoline Sulfate Modification

Flexible Lead Bromide Perovskite Solar Cells

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CH3NH3Br Additive for Enhanced Photovoltaic Performance and Air Stability of Planar Perovskite Solar Cells prepared by Two‐Step Dipping Method

Cited by 19 publications

References 46 publications

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Shape‐Dependent Kinetics of Halide Vacancy Filling in Organolead Halide Perovskites

Carbon-Based Stable CsPbIBr2 Solar Cells with Efficiency of over 10% from Bifunctional Quinoline Sulfate Modification

Flexible Lead Bromide Perovskite Solar Cells

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Product

Resources

About

CH₃NH₃Br Additive for Enhanced Photovoltaic Performance and Air Stability of Planar Perovskite Solar Cells prepared by Two‐Step Dipping Method

Carbon-Based Stable CsPbIBr₂ Solar Cells with Efficiency of over 10% from Bifunctional Quinoline Sulfate Modification