Lead-free bismuth-based perovskites coupled with g–C3N4: A machine learning based novel approach for visible light induced degradation of pollutants

Miodyńska, Magdalena; Mikołajczyk, Alicja; Mazierski, Paweł; Klimczuk, Tomasz; Lisowski, Wojciech; Trykowski, Grzegorz; Zaleska-Medynska, Adriana

doi:10.1016/j.apsusc.2022.152921

Cited by 20 publications

(12 citation statements)

References 96 publications

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“…Since the structural properties of perovskite are determined by the 6s 2 6p 0 configuration of Pb 2+ , the accessible replacement element is Bi 3+ due to its comparable electronic distribution and lone-pair electron compared to Pb 2+ [ 18 , 19 ]. A₃Bi 2 × 9 is the general structural formula for Bi-based perovskites, where A represents cations, such as Na + , K + , Rb + , Cs+, or CH₃NH 3+ (methyl ammonium (MA)), and X represents a halogen element (F, Cl, Br, or I) [ 20 ]. The Bi 3+ cation is a low-temperature processable solution, has a significant dielectric constant, and has a stable 6p-block structure, all of which make it non-toxic.…”

Section: Introductionmentioning

confidence: 99%

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

et al. 2022

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Lead-free, bismuth-based perovskite solar cells (PSCs) are promising, non-toxic, and stable alternatives to lead-based PSCs, which are environmentally harmful and highly unstable under deprived air conditions. However, bismuth-based PSCs still suffer from low-power-conversion efficiency (PCE) due to their large bandgap and poor film morphology. Their poor film-forming ability is the greatest obstacle to Cs₃Bi₂I₉ progress in thin-film solar cell technology. This study synthesizes novel, lead-free perovskites with a small bandgap, excellent stability, and highly improved photovoltaic performance by integrating different amounts of potassium iodide (KI) into a perovskite precursor solution. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the potential contact distribution, which is demonstrated by X-ray diffraction, electronic scanning microscopy, atomic force microscopy, and ultraviolet-visible spectroscopy. The Cs₃Bi₂I₉ PSC device with 2 vol. % incorporation of KI shows the highest PCE of 2.81% and Voc of 1.01 V as far as all the Bi-based cells fabricated for this study are concerned. The study demonstrates that incorporating KI in the Cs₃Bi₂I₉ perovskite layer highly stabilizes the resultant PSC device against humidity to the extent that it maintains 98% of the initial PCE after 90 days, which is suitable for solar cell applications. The devices also demonstrate greater resistance to airborne contaminants and high temperatures without encapsulation, opening up new possibilities for lead-free Cs₃Bi₂I₉ PSCs in future commercialization.

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Section: Introductionmentioning

confidence: 99%

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

et al. 2022

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“…In general, a further enhancement of the MHPs photocatalytic activity is achieved by using them in combination with a second semiconductor, as is commonly performed in current research, i.e., by creating heterojunctions. Among other visible-light active catalysts, graphitic carbon nitride (g-C 3 N 4 ) has been already advantageously used to create composite systems with lead-free MHPs [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Heterojunctions Based on Cs3Bi2Br9 Nanocrystals and g-C3N4 Nanosheets for Photocatalytic Hydrogen Evolution

et al. 2023

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Heterojunctions based on metal halide perovskites (MHPs) are promising systems for the photocatalytic hydrogen evolution reaction (HER). In this work, we coupled Cs3Bi2Br9 nanocrystals (NCs), obtained by wet ball milling synthesis, with g-C3N4 nanosheets (NSs), produced by thermal oxidation of bulk g-C3N4, in air. These methods are reproducible, inexpensive and easy to scale up. Heterojunctions with different loadings of Cs3Bi2Br9 NCs were fully characterised and tested for the HER. A relevant improvement of H2 production with respect to pristine carbon nitride was achieved at low NCs levels reaching values up to about 4600 µmol g−1 h−1. This work aims to provide insights into the synthesis of inexpensive and high-performing heterojunctions using MHP for photocatalytic applications.

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“…Although the photovoltaic efficiency is low, [PEA] 3 [Bi 2 I 9 ] material exhibits higher stability compared to lead analogs. In addition, bismuth-based organic halides also exhibit certain optical properties, 18 which have potential wide applications in solar cells and optoelectronic devices. 19 film shows the smooth surface morphology of its thin film and good connectivity between conductive and non-conductive parts of the interdigital electrode ITO glass, as shown in Figure 2b.…”

Section: Introductionmentioning

confidence: 99%

Crystal structure, optical properties, mobility, and photoelectric performance of [PEA]₃[Bi₂I₉]

Wang,

Li,

Cao

et al. 2023

Applied Organom Chemis

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Lead halide‐based salts exhibit good photoelectric properties; however, the use, leakage, and recovery of toxic lead require careful consideration. Therefore, developing a lead‐free optoelectronic material conveniently and quickly is very important. Moreover, there is relatively little research on the salts of bismuth halides. In this study, we synthesized [PEA]3[Bi2I9] single crystals (SC) by volatilizing N,N‐dimethylformamide (DMF) solvent at 70°C. The crystal system and spatial group of [PEA]3[Bi2I9] are monoclinic and P21/n, respectively. The Tauc plot reveals the optical band gap of the [PEA]3[Bi2I9] SC at 2.048 eV. The carrier mobility of [PEA]3[Bi2I9] SC is 47.4 cm2 V−1 s−1. Steady‐state fluorescence and time‐resolved fluorescence spectrum indicate that there are four fluorescence peaks and about 7 μs lifetime, respectively. The photodetector based on [PEA]3[Bi2I9] SC under different voltages (0.5, 1, 1.5, 2, and 2.5 V) exhibits stability and regularity with turning‐on/off of the light. In addition, thermogravimetric analysis (TGA) tests indicate that [PEA]3[Bi2I9] SC has considerable thermal stability at temperatures up to 260°C, showing promise for becoming a high temperature resistant and nontoxic sensor with good application prospects.

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Lead-free bismuth-based perovskites coupled with g–C3N4: A machine learning based novel approach for visible light induced degradation of pollutants

Cited by 20 publications

References 96 publications

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

Preparation of Heterojunctions Based on Cs3Bi2Br9 Nanocrystals and g-C3N4 Nanosheets for Photocatalytic Hydrogen Evolution

Crystal structure, optical properties, mobility, and photoelectric performance of [PEA]₃[Bi₂I₉]

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Lead-free bismuth-based perovskites coupled with g–C3N4: A machine learning based novel approach for visible light induced degradation of pollutants

Cited by 20 publications

References 96 publications

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

Potassium Iodide-Modified Lead-Free Cs3Bi2I9 Perovskites for Enhanced High-Efficiency Solar Cells

Preparation of Heterojunctions Based on Cs3Bi2Br9 Nanocrystals and g-C3N4 Nanosheets for Photocatalytic Hydrogen Evolution

Crystal structure, optical properties, mobility, and photoelectric performance of [PEA]3[Bi2I9]

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Crystal structure, optical properties, mobility, and photoelectric performance of [PEA]₃[Bi₂I₉]