Special Issue "Hybrid Perovskite Thin Film"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (31 December 2021).

Special Issue Editors

Prof. Dr. Min-Cherl Jung
E-Mail Website
Guest Editor
Division of Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Japan
Interests: organic-inorganic hybrid perovskite thin film and its applications
Dr. Shenghao Wang
E-Mail Website
Guest Editor
Materials Genome Institute, Shanghai University, Shanghai, China
Interests: thin film growth; organic electronic materials & devices (solar cells, organic light emitting diode, detectors); surface & interface science
Dr. Longbin Qiu
E-Mail Website
Guest Editor
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, China
Interests: flexible and wearable electronics; synthesis of aligned nano-carbon materials assembly; energy materials for clean energy conversion and storage; surface/interface science of charge transport in photovoltaic devices; scalable chemical vapor deposition of perovskite films for photovoltaic modules

Special Issue Information

Dear Colleagues,

Organic-inorganic hybrid perovskite materials (OHP, AMX3, where A is organic or inorganic cation, M is metal cation, and X is a halogen anion) show considerable potential for solar cell and light-emitting diode applications. In solar cell applications, the power conversion efficiency is already over 25%, which is highly competitive in comparison with CdTe (22.1%), CIGS (22.6%), and Si (25.4%). To overcome the weakness of OHP materials, such as material instability, many researchers are focusing on studying instability origins, stable compounds, defect structures, and multi-functional hole transport layer (good hole mobility and water protection). This work is proceeding to engineering optimization now. However, its fundamental properties in thin films such as defects, phonon dispersion, and electronic structure are not fully understood, which is why many researchers are still attempting to improve its weakness in actual devices.

 This Special Issue of Nanomaterials, “Hybrid Perovskite Thin Film”, will be focused on (1) thin film fabrication; (2) basic characterizations with atomic, chemical, and electronic structures; (3) defects and their effects; and (4) suggesting possible new application using OHP materials.

Prof. Min-Cherl Jung
Dr. Shenghao Wang
Dr. Longbin Qiu
Guest Editors

Manuscript Submission Information

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Keywords

  • organic-inorganic hybrid perovskite
  • OHP thin film
  • fabrication methods and basic characterizations
  • atomic, chemical, and electronic structures
  • defect/contamination and their effects
  • physical property
  • possible new applications

Published Papers (5 papers)

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Research

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Article
Low Dark Current and Performance Enhanced Perovskite Photodetector by Graphene Oxide as an Interfacial Layer
Nanomaterials 2022, 12(2), 190; https://doi.org/10.3390/nano12020190 - 06 Jan 2022
Viewed by 117
Abstract
Organic-inorganic hybrid perovskite photodetectors are gaining much interest recently for their high performance in photodetection, due to excellent light absorption, low cost, and ease of fabrication. Lower defect density and large grain size are always favorable for efficient and stable devices. Herein, we [...] Read more.
Organic-inorganic hybrid perovskite photodetectors are gaining much interest recently for their high performance in photodetection, due to excellent light absorption, low cost, and ease of fabrication. Lower defect density and large grain size are always favorable for efficient and stable devices. Herein, we applied the interface engineering technique for hybrid trilayer (TiO2/graphene oxide/perovskite) photodetector to attain better crystallinity and defect passivation. The graphene oxide (GO) sandwich layer has been introduced in the perovskite photodetector for improved crystallization, better charge extraction, low dark current, and enhanced carrier lifetime. Moreover, the trilayer photodetector exhibits improved device performance with a high on/off ratio of 1.3 × 104, high responsivity of 3.38 AW1, and low dark current of 1.55 × 10−11 A. The insertion of the GO layer also suppressed the perovskite degradation process and consequently improved the device stability. The current study focuses on the significance of interface engineering to boost device performance by improving interfacial defect passivation and better carrier transport. Full article
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
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Article
Evaporation of Methylammonium Iodide in Thermal Deposition of MAPbI3
Nanomaterials 2021, 11(10), 2532; https://doi.org/10.3390/nano11102532 - 28 Sep 2021
Cited by 1 | Viewed by 602
Abstract
Thermal evaporation is an important technique for fabricating methylammonium lead iodide (MAPbI3), but the process is complicated by the need to co-evaporate methylammonium iodide (MAI) and PbI2. In this work, the effect of water vapor during the thermal deposition [...] Read more.
Thermal evaporation is an important technique for fabricating methylammonium lead iodide (MAPbI3), but the process is complicated by the need to co-evaporate methylammonium iodide (MAI) and PbI2. In this work, the effect of water vapor during the thermal deposition of MAPbI3 was investigated under high vacuum. The evaporation process was monitored with a residual gas analyzer (RGA), and the film quality was examined with X-ray photoelectron spectroscopy (XPS). The investigations showed that during evaporation, MAI decomposed while PbI2 evaporated as a whole compound. It was found that the residual water vapor reacted with one of the MAI-dissociated products. The higher iodine ratio suggests that the real MAI flux was higher than the reading from the QCM. The XPS analysis demonstrated that the residual water vapor may alter the elemental ratios of C, N, and I in thermally deposited MAPbI3. Morphologic properties were investigated with atomic force microscopy (AFM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). It was observed that a sample grown with high water vapor pressure had a roughened surface and poor film quality. Therefore, an evaporation environment with water vapor pressure below 10−8 Torr is needed to fabricate high quality perovskite films. Full article
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
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Article
Strong Linear Correlation between CH3NH2 Molecular Defect and THz-Wave Absorption in CH3NH3PbI3 Hybrid Perovskite Thin Film
Nanomaterials 2020, 10(4), 721; https://doi.org/10.3390/nano10040721 - 10 Apr 2020
Cited by 5 | Viewed by 1311
Abstract
To control the density of a CH3NH2 molecular defect, which strongly contributed to a significant THz-wave absorption property in the CH3NH3PbI3 hybrid perovskite thin film formed by the sequential vacuum evaporation method, we performed post-annealing [...] Read more.
To control the density of a CH3NH2 molecular defect, which strongly contributed to a significant THz-wave absorption property in the CH3NH3PbI3 hybrid perovskite thin film formed by the sequential vacuum evaporation method, we performed post-annealing processes with various temperatures and times. In the thin film after post-annealing at 110 °C for 45 min, the density of the CH3NH2 molecular defect was minimized, and CH3NH3I and PbI2 disappeared in the thin film after the post-annealing process at 150 °C for 30 min. However, the density of the CH3NH2 molecular defect increased. Moreover, the THz-wave absorption property for each thin film was obtained using a THz time-domain spectroscopy to understand the correlation between the density of a molecular defect and the THz-wave oscillation strength at 1.6 THz, which originated in the molecular defect-incorporated hybrid perovskite structure. There is a strong linear correlation between the oscillator strength of a significant THz-wave absorption at 1.6 THz and the CH3NH2 molecular defect density. Full article
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
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Communication
Enhancement of Photoluminescence Quantum Yield and Stability in CsPbBr3 Perovskite Quantum Dots by Trivalent Doping
Nanomaterials 2020, 10(4), 710; https://doi.org/10.3390/nano10040710 - 09 Apr 2020
Cited by 6 | Viewed by 1720
Abstract
We determine the influence of substitutional defects on perovskite quantum dots through experimental and theoretical investigations. Substitutional defects were introduced by trivalent dopants (In, Sb, and Bi) in CsPbBr3 by ligand-assisted reprecipitation. We show that the photoluminescence (PL) emission peak shifts toward [...] Read more.
We determine the influence of substitutional defects on perovskite quantum dots through experimental and theoretical investigations. Substitutional defects were introduced by trivalent dopants (In, Sb, and Bi) in CsPbBr3 by ligand-assisted reprecipitation. We show that the photoluminescence (PL) emission peak shifts toward shorter wavelengths when doping concentrations are increased. Trivalent metal-doped CsPbBr3 enhanced the PL quantum yield (~10%) and air stability (over 10 days). Our findings provide new insights into the influence of substitutional defects on substituted CsPbBr3 that underpin their physical properties. Full article
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
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Review

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Review
Review of Interface Passivation of Perovskite Layer
Nanomaterials 2021, 11(3), 775; https://doi.org/10.3390/nano11030775 - 18 Mar 2021
Cited by 3 | Viewed by 1424
Abstract
Perovskite solar cells (PSCs) are the most promising substitute for silicon-based solar cells. However, their power conversion efficiency and stability must be improved. The recombination probability of the photogenerated carriers at each interface in a PSC is much greater than that of the [...] Read more.
Perovskite solar cells (PSCs) are the most promising substitute for silicon-based solar cells. However, their power conversion efficiency and stability must be improved. The recombination probability of the photogenerated carriers at each interface in a PSC is much greater than that of the bulk phase. The interface of a perovskite polycrystalline film is considered to be a defect-rich area, which is the main factor limiting the efficiency of a PSC. This review introduces and summarizes practical interface engineering techniques for improving the efficiency and stability of organic–inorganic lead halide PSCs. First, the effect of defects at the interface of the PSCs, the energy level alignment, and the chemical reactions on the efficiency of a PSC are summarized. Subsequently, the latest developments pertaining to a modification of the perovskite layers with different materials are discussed. Finally, the prospect of achieving an efficient PSC with long-term stability through the use of interface engineering is presented. Full article
(This article belongs to the Special Issue Hybrid Perovskite Thin Film)
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