Nearly monodisperse PbS quantum dots for highly efficient solar cells: an<i>in situ</i>seeded ion exchange approach

Dou, Yi; Zhou, Ru; Wan, Lei; Niu, Haihong; Zhou, Juntian; Xu, Jinzhang; Cao, Guozhong

doi:10.1039/c8cc07496h

Cited by 17 publications

(9 citation statements)

References 32 publications

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“…where A is the absorption coefficient, h is the Planck constant, υ is the incident photon frequency, c is a constant, and E g represents the bandgap of MAPbI 3 . [39,40] The top-view SEM images of MAPbI 3 perovskite films deposited on CdS and S-CdS ETLs are shown in Figure 5a,b, which reveal that the perovskite based on different ETLs shows uniform and compact surface morphology; by comparison, the perovskite based on the S-CdS ETL shows more grains with the diameter exceeding 600 nm, as reflected by the histograms of the statistics of perovskite grain sizes as given in the insets. This phenomenon may be associated to the assistance of colloidal SnO 2 underlayer, which reduces the surface roughness and improves the wettability of CdS ETL toward the perovskite precursor solution.…”

Section: Resultsmentioning

confidence: 98%

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Zhou

Zhu

et al. 2021

Solar RRL

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Organic-inorganic hybrid perovskite materials have gained remarkable attention in the photovoltaic community due to their superior optical and electrical properties, including high carrier mobility, large light absorption coefficient, tunable bandgap, low trap density, etc. [1][2][3][4] Nowadays, the certified record power conversion efficiency (PCE) of perovskite solar cells (PSCs) has been boosted from 3.8% to 25.5%, [5,6] benefitting from great endeavors focusing on interface engineering, composition modulation, solvent engineering, crystallinity regulation, etc. [7][8][9] As one of extensively used architectures, the typical planar-type PSC comprises transparent conductive substrate, compact electron transport layer (ETL), perovskite absorber layer, hole transport layer (HTL), and metal electrode. [10][11][12] Thereinto, ETL plays a critical role in extracting and transport electrons from perovskite materials to conducting substrate. Hence, it is crucial to design high-quality ETLs with outstanding electron extraction capability for high-performance PSCs. [13,14] It is known that TiO 2 serves as a conventional widely used ETL that delivers PSCs with efficiencies >20%. [15,16] However, the preparation of TiO 2 ETLs usually suffers from high-temperature sintering processes (>450 C); moreover, the low electron mobility and high-density oxygen vacancy trap states of TiO 2 also restrict the further development of TiO 2 -based PSCs. [17,18] Under such circumstances, researchers are dedicated to explore more promising low-temperature processed ETLs for PSCs, such as SnO 2 , CdS, ZnS, SnS 2 , etc. [19][20][21][22] Of these ETLs, CdS shows unique advantages, including: 1) CdS thin films

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Section: Resultsmentioning

confidence: 98%

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Zhou

Zhu

et al. 2021

Solar RRL

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“…In addition to the passivation layer, ZnS could be used as a template for preparing other metal sulfides − , via cation or anion exchange. − ,− Thus, the easily formed nontoxic ZnS semiconducting layers can be a useful starting material that will be transformed into more complex metal chalcogenides by a simple ion-exchange process. Among many QD sensitizers, antimony(III) sulfide (Sb 2 S 3 ) has been investigated as a representative nontoxic metal chalcogenide with an efficient photoresponse in the visible range down to ∼1.7 eV. − However, the effective preparation route for Sb 2 S 3 is rather limited to a complex in situ chemical bath deposition (CBD) that requires precise control of experimental parameters at a low temperature below 10 °C.…”

Section: Resultsmentioning

confidence: 99%

Adsorption and Cation-Exchange Behavior of Zinc Sulfide on Mesoporous TiO₂ Film and Its Applications to Solar Cells

2020

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Zinc sulfide (ZnS) was deposited onto the surface of mesoporous TiO2 film by a typical successive ionic layer adsorption and reaction (SILAR) process. By inducing a spontaneous cation exchange between ZnS and a target cation (Pb2+, Cu2+, Ag+, or Bi3+) dissolved in a chemical bath when they are in contact, it was demonstrated successfully that white translucent ZnS on the substrate could be changed to new brown-colored metal chalcogenides and the amount of ZnS deposited originally by different conditions could be compared in a qualitative way with the degree of color change. By utilizing this simple but effective process, the evolution of a well-known ZnS passivation layer prepared from different chemical baths in quantum dot (QD)-sensitized solar cells could be tracked visually by checking the degree of color change of TiO2/ZnS electrodes after the induced specific cation exchange. When applied to representative CdS QD-sensitized solar cells, it was revealed clearly how the different degrees and rates of ZnS deposition could affect the overall power conversion efficiency while finding an optimized passivation layer over TiO2/CdS electrode. An acetate anion-coupled Zn2+ source was observed to give a much faster deposition of a ZnS passivation layer than a nitrate anion one because of its higher pH-induced more-favorable adsorption of Zn2+ on the surface of TiO2. As another useful application of the ZnS-based cation exchange, as-deposited ZnS was used as a template for preparing a more complex metal chalcogenide onto a mesoporous TiO2 film. The ZnS-derived Sb2S3-sensitized electrode showed a promising initial result of over 1.0% overall power conversion efficiency with a very thin ZrO2 passivation layer between TiO2 and Sb2S3.

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“…[67] The ion exchange strategy attracts increasing concerns because it is able to synthesize QDs with particular size, shape, and composition requirements. [37,68] We propose a new anion exchange strategy that can deposit high-quality nearly monodisperse PbS QDs on mesoporous semiconductor oxide films, as shown in Figure 2. [37] The ion exchange occurs between SO 3 2− and S 2− at room temperature and atmospheric environment.…”

Section: In Situ Depositionmentioning

confidence: 99%

Near‐Infrared Photoactive Semiconductor Quantum Dots for Solar Cells

Zhou

Luo

et al. 2021

Advanced Energy Materials

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Nearly monodisperse PbS quantum dots for highly efficient solar cells: anin situseeded ion exchange approach

Abstract: A facilein situseeded ion-exchange is explored to produce nearly monodisperse Pbs QDs sensitized mesoporous TiO2for highly efficient photovoltaics.

Cited by 17 publications

References 32 publications

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Adsorption and Cation-Exchange Behavior of Zinc Sulfide on Mesoporous TiO₂ Film and Its Applications to Solar Cells

Near‐Infrared Photoactive Semiconductor Quantum Dots for Solar Cells

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Nearly monodisperse PbS quantum dots for highly efficient solar cells: anin situseeded ion exchange approach

Abstract: A facilein situseeded ion-exchange is explored to produce nearly monodisperse Pbs QDs sensitized mesoporous TiO2for highly efficient photovoltaics.

Cited by 17 publications

References 32 publications

Colloidal SnO2‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO2‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Adsorption and Cation-Exchange Behavior of Zinc Sulfide on Mesoporous TiO2 Film and Its Applications to Solar Cells

Near‐Infrared Photoactive Semiconductor Quantum Dots for Solar Cells

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Product

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Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Colloidal SnO₂‐Assisted CdS Electron Transport Layer Enables Efficient Electron Extraction for Planar Perovskite Solar Cells

Adsorption and Cation-Exchange Behavior of Zinc Sulfide on Mesoporous TiO₂ Film and Its Applications to Solar Cells