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Research on Perovskite Materials and Optoelectronic Devices

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Energy Materials".

Deadline for manuscript submissions: closed (20 October 2022) | Viewed by 7858

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Special Issue Editor

Dr. Himchan Cho

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Guest Editor

Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea
Interests: metal halide perovskites; inorganic quantum dots; luminescence; nanocrystals; light-emitting diodes; surface engineering; patterning

Special Issue Information

Dear Colleagues,

Metal halide perovskites have been actively studied in fields of optoelectronics including solar cells and light-emitting diodes because of a unique combination of advantages including a high absorption coefficient, high photoluminescence quantum yield, high charge carrier mobility, compositional tunability, and solution processability. Although significant progress has been already made, the fundamental limitations of halide perovskites, such as low material/device stability and toxicity, must be overcome for successful commercialization. This requires extensive and rigorous studies from both materials and device perspectives.

It is my pleasure to invite you to submit a manuscript (original research or review articles) to this Special Issue that will be focused on metal halide perovskite materials and optoelectronic devices. The following topics are expected to be submitted but the issue is not limited to them.

Materials physics/chemistry/engineering (e.g., low-dimensional perovskites, lead-free perovskites, surface/interface engineering, and grain size/morphology control)
Device physics/engineering (solar cells, light-emitting diodes, photodetectors, etc.)
Colloidal perovskite nanocrystals
Solution processing and patterning

Dr. Himchan Cho
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

metal halide perovskites
optoelectronic devices
structure
synthesis
surface
device engineering
luminescence
optical properties
electrical properties
solution processing

Published Papers (3 papers)

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Research

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16 pages, 3644 KiB

Open AccessArticle

The Investigation of the Influence of a Cu₂O Buffer Layer on Hole Transport Layers in MAPbI₃-Based Perovskite Solar Cells

by Chunxiang Lin, Guilin Liu, Xi Xi, Lan Wang, Qiqi Wang, Qiyan Sun, Mingxi Li, Bingjie Zhu, David Perez de Lara and Huachao Zai

Materials 2022, 15(22), 8142; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15228142 - 17 Nov 2022

Cited by 11 | Viewed by 2150

Abstract

The passivation engineering of the hole transport layer in perovskite solar cells (PSCs) has significantly decreased carrier accumulation and open circuit voltage (V_oc) loss, as well as energy band mismatching, thus achieving the goal of high-power conversion efficiency. However, most devices incorporating organic/inorganic buffer layers suffer from poor stability and low efficiency. In this article, we have proposed an inorganic buffer layer of Cu₂O, which has achieved high efficiency on lower work function metals and various frequently used hole transport layers (HTLs). Once the Cu₂O buffer layer was applied to modify the Cu/PTAA interface, the device exhibited a high V_oc of 1.20 V, a high FF of 75.92%, and an enhanced PCE of 22.49% versus a V_oc of 1.12 V, FF of 69.16%, and PCE of 18.99% from the (PTAA/Cu) n-i-p structure. Our simulation showed that the application of a Cu₂O buffer layer improved the interfacial contact and energy alignment, promoting the carrier transportation and reducing the charge accumulation. Furthermore, we optimized the combinations of the thicknesses of the Cu₂O, the absorber layer, and PTAA to obtain the best performance for Cu-based perovskite solar cells. Eventually, we explored the effect of the defect density between the HTL/absorber interface and the absorber/ETL interface on the device and recommended the appropriate reference defect density for experimental research. This work provides guidance for improving the experimental efficiency and reducing the cost of perovskite solar cells. Full article

(This article belongs to the Special Issue Research on Perovskite Materials and Optoelectronic Devices)

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24 pages, 17356 KiB

Open AccessArticle

Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH₃NH₃PbI₃ Crystals

by Roxana E. Patru, Hamidreza Khassaf, Iuliana Pasuk, Mihaela Botea, Lucian Trupina, Constantin-Paul Ganea, Lucian Pintilie and Ioana Pintilie

Materials 2021, 14(15), 4215; https://0-doi-org.brum.beds.ac.uk/10.3390/ma14154215 - 28 Jul 2021

Cited by 6 | Viewed by 2718

Abstract

The frequency and temperature dependence of dielectric properties of CH₃NH₃PbI₃ (MAPI) crystals have been studied and analyzed in connection with temperature-dependent structural studies. The obtained results bring arguments for the existence of ferroelectricity and aim to complete the current knowledge on the thermally activated conduction mechanisms, in dark equilibrium and in the presence of a small external a.c. electric field. The study correlates the frequency-dispersive dielectric spectra with the conduction mechanisms and their relaxation processes, as well as with the different transport regimes indicated by the Nyquist plots. The different energy barriers revealed by the impedance spectroscopy highlight the dominant transport mechanisms in different frequency and temperature ranges, being associated with the bulk of the grains, their boundaries, and/or the electrodes’ interfaces. Full article

(This article belongs to the Special Issue Research on Perovskite Materials and Optoelectronic Devices)

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Review

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21 pages, 7290 KiB

Open AccessReview

3D and 2D Metal Halide Perovskites for Blue Light-Emitting Diodes

by Min-Ho Park

Materials 2022, 15(13), 4571; https://0-doi-org.brum.beds.ac.uk/10.3390/ma15134571 - 29 Jun 2022

Cited by 7 | Viewed by 2367

Abstract

Metal halide perovskites (MHPs) are emerging next-generation light emitters that have attracted attention in academia and industry owing to their low material cost, simple synthesis, and wide color gamut. Efficient strategies for MHP modification are being actively studied to attain high performance demonstrated by commercial light-emitting diodes (LEDs) based on organic emitters. Active studies have overcome the limitations of the external quantum efficiencies (EQEs) of green and red MHP LEDs (PeLEDs); therefore, the EQEs of PeLEDs (red: 21.3% at 649 nm; green: 23.4% at 530 nm) have nearly reached the theoretical limit for the light outcoupling of single-structured planar LEDs. However, the EQEs of blue PeLEDs (12.1% at 488 nm and 1.12% at 445 nm) are still lower than approximately half of those of green and red PeLEDs. To commercialize PeLEDs for future full-color displays, the EQEs of blue MHP emitters should be improved by approximately 2 times for sky-blue and more than 20 times for deep-blue MHP emitters to attain values comparable to the EQEs of red and green PeLEDs. Therefore, based on the reported effective approaches for the preparation of blue PeLEDs, a synergistic strategy for boosting the EQE of blue PeLEDs can be devised for commercialization in future full-color displays. This review covers efficient strategies for improving blue PeLEDs using fundamental approaches of material engineering, including compositional or dimensional engineering, thereby providing inspiration for researchers. Full article

(This article belongs to the Special Issue Research on Perovskite Materials and Optoelectronic Devices)

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