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Two-Dimensional Materials for Photoelectrochemical Energy Conversion and Photodetection
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Two-Dimensional Materials for Photoelectrochemical Energy Conversion and Photodetection

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

Deadline for manuscript submissions: 20 September 2026 | Viewed by 1054

Editor

Prof. Dr. Yong Liu

E-Mail Website
Guest Editor
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering (ISMSE), Wuhan University of Technology, Wuhan 430070, China
Interests: ordered porous materials; self-assembly; two-dimensional semiconductor heterojunction; photoelectronic thin film devices; catalyst; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue focuses on cutting-edge research and innovative developments in the photoelectrochemical and photodetection properties of two-dimensional materials. Nanomaterials and low-dimensional structures, such as quantum dots, nanowires, and 2D materials, exhibit exceptional light–matter interactions and charge transport characteristics due to their reduced dimensions and enhanced surface-to-volume ratios. These properties are pivotal for applications in energy conversion, storage, sensors, and environmental remediation.

We welcome the submission of articles that address the synthesis, characterization, and application of these materials. Topics of interest include, but are not limited to, the following:

  • Novel synthesis methods for nanomaterials and low-dimensional structures.
  • Characterization of photoelectrochemical behavior, carrier dynamics, and spectral response.
  • The design and optimization of nanomaterials for improved photoelectric performance in solar cells, LEDs, and photodetectors.
  • High-sensitivity, broadband, and ultrafast photodetectors based on 2D materials.
  • Theoretical and computational studies that provide insights into the mechanisms governing these properties.

This Special Issue aims to connect researchers from diverse fields to foster interdisciplinary collaboration and advance our understanding of the fundamental and applied aspects of nanomaterials and low-dimensional structures.

Prof. Dr. Yong Liu
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 250 words) can be sent to the Editorial Office for assessment.

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-anonymized 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

  • nanomaterials
  • low-dimensional structure
  • photoelectric properties
  • energy conversion

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Published Papers (2 papers)

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Research

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12 pages, 1394 KB  
Article
2D Ruddlesden-Popper Perovskite (C6H5NH3)2CsPb2Cl7 with Favorable Radiative Recombination and Field-Effect Transport
by Zhe Pang, Yuxuan Wang, Chong Peng, Yingfei Liu, Jiaqian Que, Kefeiyang Hu, Xingbo Huang and Yong Liu
Materials 2026, 19(10), 1991; https://doi.org/10.3390/ma19101991 - 11 May 2026
Viewed by 357
Abstract
Organic–inorganic hybrid halide perovskites have attracted extensive attention due to their excellent optoelectronic properties and potential applications in field-effect transistors (FET), light-emitting diodes (LEDs), and photodetectors. However, conventional three-dimensional (3D) perovskites are limited by intrinsic instability and ion migration. Two-dimensional Ruddlesden-Popper (2D RP) [...] Read more.
Organic–inorganic hybrid halide perovskites have attracted extensive attention due to their excellent optoelectronic properties and potential applications in field-effect transistors (FET), light-emitting diodes (LEDs), and photodetectors. However, conventional three-dimensional (3D) perovskites are limited by intrinsic instability and ion migration. Two-dimensional Ruddlesden-Popper (2D RP) perovskites offer improved structural stability, but many systems still suffer from modest photoluminescence efficiency and limited charge-transport performance. In this work, a novel 2D RP perovskite, (C6H5NH3)2CsPb2Cl7, was designed and synthesized, where the anilinium ion (C6H5NH3+) serves as the organic spacer. Structural characterization indicates that the material possesses high crystallinity and a smooth surface morphology. Optical measurements reveal a violet emission peak at 411 nm with a single-peak feature and a full width at half maximum (FWHM) of 10 nm. The bandgap is determined to be 3.1 eV. Time-resolved photoluminescence (TRPL) measurements show an average lifetime of 4 ns, and the photoluminescence quantum yield (PLQY) is 29.8%. Based on the measured PLQY and lifetime, the radiative and non-radiative recombination rates were estimated to be Kr ≈ 7.45 × 107 s−1 and Knr ≈ 1.76 × 108 s−1, respectively, suggesting that radiative recombination is appreciable although non-radiative pathways remain present. FET measurements demonstrate an on/off current ratio of 104 and a carrier mobility of 1.1 cm2 V−1 s−1. Without any systematic optimization, (C6H5NH3)2CsPb2Cl7 exhibits relatively favorable emissive behavior and measurable field-effect charge transport performance when compared with structurally similar 2D RP perovskites reported under comparable, non-optimized conditions. This study expands the family of chloride-based 2D perovskites and provides a basis for future improvements in their recombination and field-effect transport properties. Full article
(This article belongs to the Special Issue Two-Dimensional Materials for Photoelectrochemical Energy Conversion and Photodetection)
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Review

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27 pages, 4666 KB  
Review
Evolution of Ti3C2 MXene Quantum Dots for Photocatalytic and Photoelectrochemical Applications: A Review
by Adem Sreedhar and Jin-Seo Noh
Materials 2026, 19(10), 2095; https://doi.org/10.3390/ma19102095 - 16 May 2026
Viewed by 408
Abstract
The key transformation of 2D Ti3C2 MXene nanosheets into 0D Ti3C2 MXene quantum dots (Ti3C2 QDs) restructures the landscape of surface-active sites and tunable band gaps, enabling visiblelight-driven photocatalytic activity. Interestingly, the evolution of [...] Read more.
The key transformation of 2D Ti3C2 MXene nanosheets into 0D Ti3C2 MXene quantum dots (Ti3C2 QDs) restructures the landscape of surface-active sites and tunable band gaps, enabling visiblelight-driven photocatalytic activity. Interestingly, the evolution of these fascinating Ti3C2 QDs retains ordered structural characteristics like the parent 2D Ti3C2 MXene nanosheets with controlled surface chemistry even after the facile hydrothermal process. In particular, evidence of tailoring of Ti3C2 QDs smaller than 10 nm reinforces the charge carrier separation and suppresses recombination under the strong association of quantum confinement and edge effects. Thus, the physical effects of Ti3C2 QDs effectively control the limitations of semiconductors, such as charge carrier recombination, slow charge carrier separation, and transportation in the resultant photocatalyst, for the implementation of promising toxic matter degradation and clean H2 production. Special considerations are given to the regulation of charge carrier generation and separation for stable photocatalytic performance, such as appropriate band gap formation, localized surface plasmonic behavior, and Schottky barrier formation at the semiconductor interface. Specifically, pure Ti3C2 QDs with a size smaller than 10 nm exhibit a band gap of 2.16 eV, which has been found to be a powerful way to enable semiconductor-like photoresponse behavior. Overall, the above features make Ti3C2 QDs the preferred choice for facilitating effective charge carrier dynamics for the optimization of chemical stability in optoelectronic applications. The paper concludes with challenges and future perspectives to guide the 0D Ti3C2 QDs practical applicability in light-driven and sustainable environmental applications. Full article
(This article belongs to the Special Issue Two-Dimensional Materials for Photoelectrochemical Energy Conversion and Photodetection)
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