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Organic and Hybrid Optoelectronic Materials and Devices

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A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optoelectronics and Optical Materials".

Deadline for manuscript submissions: closed (20 April 2024) | Viewed by 6961

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Special Issue Editors

Dr. Aung Ko Ko Kyaw

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Guest Editor

Department of Electrical & Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
Interests: optoelectronics; photovoltaics; thermoelectric; flexible and wearable electronics
Special Issues, Collections and Topics in MDPI journals

Dr. Tao Ye

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Guest Editor

School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
Interests: perovskite solar cells; flexible electronics; lead-free perovskites; fully inorganic perovskites; solar modules; interface engineering

Special Issue Information

Dear Colleagues,

Organic and hybrid optoelectronic materials are highly attractive due to the possibility of solution deposition, their low cost, and the ability to tune optoelectronic properties. In the past decades, significant developments have been made for organic and hybrid optoelectronic devices regarding photophysical and chemical properties of new materials, new nanostructures, device physics, and novel device configurations. Organic and hybrid optoelectronic materials include organic conductors and semiconductors, conducting polymers, conjugated polymer semiconductors, hybrid halide perovskites (3D, 2D, nanocrystals, polycrystals, etc.), colloidal nanocrystals, hybrid 2D nanostructures consisting of two-dimensional materials and polymers or molecules, polymer composites with inorganic fillers, organic/inorganic heterojunctions, etc. They have been widely used in large number of optoelectronic applications, such as organic solar cells, organic photodetectors, organic LEDs, organic phototransistors, perovskite solar cells, perovskite lasers, perovskite photodetectors, perovskite LEDs, perovskites phototransistors, etc.

This Special Issue aims to publish state-of-the-art unpublished works exploring the use of organic and hybrid materials in various optoelectronic devices. Topics will include, but are not limited to, novel organic and hybrid optoelectronic materials, new organic and hybrid optoelectronic nanostructures, detailed discussions about the interfaces within the organic and hybrid optoelectronic devices, advanced organic and hybrid optoelectronic device physics; nonclassical configurations of organic and hybrid optoelectronic devices, synthesis and/or self-assembly of hybrid halide perovskites and colloidal nanocrystals, thin films and single crystals of low-dimensional perovskites, and hybrid perovskite-related photoferroelectrics. Submissions on the molecular structures, synthesis methods, and physicochemical and optoelectronic properties of lead-free hybrid perovskites are also welcome.

Dr. Aung Ko Ko Kyaw
Dr. Tao Ye
Guest Editors

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. Photonics is an international peer-reviewed open access monthly 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 2400 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

organic solar cell
organic photodetector
OLED
perovskite solar cell
perovskite laser
perovskite photodetector
perovskite LED

Published Papers (4 papers)

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Research

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13 pages, 4182 KiB

Open AccessArticle

Exploring Data Augmentation and Dimension Reduction Opportunities for Predicting the Bandgap of Inorganic Perovskite through Anion Site Optimization

by Tri-Chan-Hung Nguyen, Young-Un Kim, Insung Jung, O-Bong Yang and Mohammad Shaheer Akhtar

Photonics 2023, 10(11), 1232; https://doi.org/10.3390/photonics10111232 - 03 Nov 2023

Viewed by 655

Abstract

Significant focus has been directed towards inorganic perovskite solar cells because of their notable capabilities in converting sunlight to electricity effectively, their efficient light absorption, and their suitability for conventional semiconductor manufacturing methods. The identification of the composition of perovskite materials is an ongoing challenge to achieve high performing solar cells. Conventional methods of trial and error frequently prove insufficient, especially when confronted with a multitude of potential candidates. In response to this challenge, the suggestion is to employ a machine-learning strategy for more precise and efficient prediction of the characteristics of new inorganic perovskite materials. This work utilized a dataset sourced from the Materials Project database, consisting of 1528 ABX₃ materials with varying halide elements (X = F, Cl, Br, Se) and information regarding their bandgap characteristics, including whether they are direct or indirect. By leveraging data augmentation and machine learning (ML) techniques along with a collection of established bandgap values and structural attributes, our proposed model can accurately and rapidly predict the bandgap of novel materials, while also identifying the key elements that contribute to this property. This information can be used to guide the discovery of new organic perovskite materials with desirable properties. Six different machine learning algorithms, including Logistic Regression (LR), Multi-layer Perceptron (MLP), Decision Tree (DT), Support Vector Machine (SVM), Extreme Gradient Boosting (XGBoost), and Random Forest (RF), were used to predict the direct bandgap of potential perovskite materials for this study. RF yielded the best experimental outcomes according to the following metrics: F1-score, Recall, and Precision, attaining scores of 86%, 85%, and 86%, respectively. This result demonstrates that ML has great potential in accelerating organic perovskites material discovery. Full article

(This article belongs to the Special Issue Organic and Hybrid Optoelectronic Materials and Devices)

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9 pages, 3024 KiB

Open AccessCommunication

Highly Efficient Solution-Processed Bluish-Green Thermally Activated Delayed Fluorescence Compounds Using Di(pyridin-3-yl)methanone as Acceptor

by Yuting He, Cheng Zhang, Hao Yan, Yongshuai Chai and Deyun Zhou

Photonics 2023, 10(4), 456; https://doi.org/10.3390/photonics10040456 - 14 Apr 2023

Viewed by 1030

Abstract

Solution-processed devices with thermally activated delayed fluorescence (TADF) compounds have gained great attention due to their low cost and high performance. Here, two solution-processable TADF emitters named ACCz-DPyM and POxCz-DPyM were synthesized by coupled 9,10-dihydro-9,9-dimethylacridine or phenoxazine modified carbazole as donor with di(pyridin-3-yl)methanone as acceptor. Both TADF compounds show same small ΔΕ_ST of 0.04 eV and high PLQY of 66.2% and 58.2%. The devices fabricated by ACCz-DPyM and POxCz-DPyM as emitters show excellent performance as solution-processed with low turn-on voltage of 4.0 and 3.4 V, high luminance of 6209 and 3248 cd m⁻² at 8 V, the maximum current efficiency of 9.9 and 15.9 cd A⁻¹, the maximum external quantum efficiency of 6.6% and 6.5% and low efficiency roll-off. The solution-processed device based on ACCz-DPyM shows bluish-green emission. These results show that ACCz-DPyM and POxCz-DPyM are suitable for solution processing devices. Full article

(This article belongs to the Special Issue Organic and Hybrid Optoelectronic Materials and Devices)

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12 pages, 1871 KiB

Open AccessArticle

Exciton Transfer Dynamics and Annihilation in Rubidium–Cesium-Alloyed, Quasi-Two-Dimensional Perovskite

by Lamiaa Abdelrazik, Vidmantas Jašinskas, Žydrūnas Podlipskas, Ramūnas Aleksiejūnas, Gintautas Tamulaitis, Vidmantas Gulbinas and Aurimas Vyšniauskas

Photonics 2022, 9(8), 578; https://doi.org/10.3390/photonics9080578 - 17 Aug 2022

Viewed by 2414

Abstract

Light-emitting diodes (LEDs) based on perovskite materials are a new group of devices that are currently undergoing rapid development. A significant fraction of these devices is based on quasi-2D perovskites fabricated with large organic cations. In this work, we describe the ultrafast scale dynamics in a quasi-2D PEA₂(Rb_0.6Cs_0.4)₂Pb₃Br₁₀ perovskite material with an excess of RbBr, which was previously used to fabricate blue-emitting perovskite LEDs. The results obtained using transient absorption spectroscopy are consistent with the assumption that the carrier dynamics in this material are dominated by excitons, most of which decay by exciton–exciton annihilation when high-intensity excitation is used. Furthermore, a slow energy transfer between different quasi-2D domains taking place within 50 ps was observed. The content of the RbBr did not show any strong influence on the observed dynamics. Our results show that the exciton–exciton annihilation proceeds much faster in thin (n = 2) quasi-2D domains than in thick (n ≥ 4) domains. This finding implies that perovskites with high-n, quasi-2D domains are preferable for efficient perovskite lasers and bright perovskite LEDs. Full article

(This article belongs to the Special Issue Organic and Hybrid Optoelectronic Materials and Devices)

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Review

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63 pages, 16557 KiB

Open AccessReview

A Comprehensive Review on Defects-Induced Voltage Losses and Strategies toward Highly Efficient and Stable Perovskite Solar Cells

by Mazhar Abbas, Xiaowei Xu, Muhammad Rauf and Aung Ko Ko Kyaw

Photonics 2024, 11(1), 87; https://doi.org/10.3390/photonics11010087 - 17 Jan 2024

Viewed by 1378

Abstract

The power conversion efficiency (PCE) of single-junction perovskite solar cells (PSCs) has reached 26.1% in small-scale devices. However, defects at the bulk, surface, grain boundaries, and interfaces act as non-radiative recombination centers for photogenerated electron-hole pairs, limiting the open-circuit voltage and PCE below the Shockley–Queisser limit. These defect states also induce ion migration towards interfaces and contribute to intrinsic instability in PSCs, reducing the quasi-Fermi level splitting and causing anomalous hysteresis in the device. The influence of defects becomes more prominent in large-area devices, demonstrating much lower PCE than the lab-scale devices. Therefore, commercializing PSCs faces a big challenge in terms of rapid decline in working performance due to these intrinsic structural defects. This paper provides a comprehensive review of recent advances in understanding the nature and the classification of defects, their impact on voltage losses, device parameters, intrinsic stability, and defect quantification and characterization techniques. Novel defect passivation techniques such as compositional engineering, additive engineering, post-treatments, dimensionality engineering, and interlayer engineering are also reviewed, along with the improvements in PCE and stability based on these techniques for both small-area devices and large-area roll-to-roll coated devices. Full article

(This article belongs to the Special Issue Organic and Hybrid Optoelectronic Materials and Devices)

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