Materials Today Physics最新文献

{"title":"Poly(methyl methacrylate)-assisted construction for enhanced optical absorption nonlinearities in two-dimensional Dion-Jacobson perovskite films","authors":"Zihao Guan ,&nbsp;Zhiyuan Wei ,&nbsp;Yanyan Xue ,&nbsp;Lulu Fu ,&nbsp;Yang Zhao ,&nbsp;Lu Chen ,&nbsp;Zhipeng Huang ,&nbsp;Mark G. Humphrey ,&nbsp;Jun Xu ,&nbsp;Chi Zhang","doi":"10.1016/j.mtphys.2025.101652","DOIUrl":"10.1016/j.mtphys.2025.101652","url":null,"abstract":"<div><div>Two-dimensional (2D) Ruddlesden-Popper (RP) and Dion-Jacobson (DJ) perovskites are attractive candidates for nonlinear photonic applications, owing to their unique “multiple quantum wells” structures. However, the nonlinear optical (NLO) absorption properties of DJ perovskites with higher structural stability and charge transport capability are still not well known. Additionally, the defects at grain boundaries are a key issue limiting the optoelectronic performance of perovskite films. In this work, three n = 1 phase 2D DJ perovskite films with representative organic cations were prepared, which are (BDA)PbI₄, (AMP)PbI₄, and (PDMA)PbI₄, respectively (BDA: 1,4-butadiammonium, AMP: 4-(aminomethyl)piperidine, PDMA: 1,4-phenylenedimethanammonium). The impact of the interlayer organic cation steric effect and conjugation effect on their NLO absorption properties was systematically explored. Subsequently, a novel poly(methyl methacrylate) (PMMA) passivation strategy was proposed that improved crystal quality and reduced perovskite ion defects. NLO absorption measurements demonstrate all pristine perovskite films manifest saturable absorption (SA) responses under femtosecond (fs) laser pulses at 515 nm and turn to reverse saturable absorption (RSA) behaviors at 800 nm. These can be attributed to the quantum and dielectric confinement effects of 2D perovskites, while the better interlayer charge transport of 2D DJ perovskites also contributes to the prominent nonlinear absorption performance. After PMMA passivation treatment, 2D DJ perovskite films exhibited significantly enhanced nonlinear absorption properties under wide-band ultrafast lasers excitation, which benefit from better crystal quality and reduced trap states, implying good universality of this strategy. Owing to the hydrophobicity of PMMA, its addition also induces better ambient stability in passivated films, improving the feasibility of this material in the practical development of photonic devices and thus having broad application prospects. This work offers new insights and a more systematic mechanism explanation for the NLO absorption properties of 2D DJ perovskite films, and presents a feasible passivation strategy for optimizing their NLO absorption performance.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101652"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142981481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Intrinsically low lattice thermal conductivity and multivalley band structure induced promising high thermoelectric performance in Pb3Bi2S6","authors":"Dongyang Wang ,&nbsp;Ke Zhao ,&nbsp;Tao Hong ,&nbsp;Jiaqi Zhu ,&nbsp;Haonan Shi ,&nbsp;Bingchao Qin ,&nbsp;Yongxin Qin ,&nbsp;Guangtao Wang ,&nbsp;Xiang Gao ,&nbsp;Shaobo Cheng ,&nbsp;Chongxin Shan ,&nbsp;Li-Dong Zhao","doi":"10.1016/j.mtphys.2025.101654","DOIUrl":"10.1016/j.mtphys.2025.101654","url":null,"abstract":"<div><div>Exploring novel material with lower thermal conductivity and excellent electrical property is beneficial to the application of thermoelectrics. The recently developed Pb₃Bi₂S₆ is regarded as promising thermoelectric material since its intrinsically low thermal conductivity. However, the mechanism of phonon-glass behavior is unclear, and the intrinsic thermoelectric performance is relative lower. In this study, the mechanism of lower thermal conductivity and the thermoelectric transport properties are evaluated by first-principles calculations and Boltzmann transport theory. Our findings indicate that the hierarchical chemical bonding present in BiS₆, PbS₆, and PbS₈ polyhedral structures, arising from the dual 6<em>s</em>² lone pair electrons of Pb and Bi atoms, along with rattler-like behavior of Pb atoms, contributes to an intrinsically low lattice thermal conductivity in Pb₃Bi₂S₆. Obviously multivalley in valence band edge leads to excellent electrical properties and resulting in promising thermoelectric performance under <em>p</em>-type doping. A maximum <em>ZT</em> ∼1.25 can be obtained at 700 K with carrier concentration of ∼8.07 × 10¹⁹ cm⁻³. This work reveals the mechanism for intrinsic low lattice thermal conductivity and provides useful guidance for achieving the promising performance in Pb₃Bi₂S₆.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101654"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synchronous realization of remarkable energy-storage density and efficiency in (Na0.5Bi0.5)0.75Sr0.25TiO3-based lead-free ceramics at moderate electric fields","authors":"Yongping Pu ,&nbsp;Chunhui Wu ,&nbsp;Fangli Yu ,&nbsp;Xiang Lu ,&nbsp;Yating Ning ,&nbsp;Lei Zhang ,&nbsp;Zenghui Liu","doi":"10.1016/j.mtphys.2025.101657","DOIUrl":"10.1016/j.mtphys.2025.101657","url":null,"abstract":"<div><div>Lead-free dielectric ceramics, as vital components of eco-friendly advanced pulse power systems, have encountered challenges for simultaneously achieving excellent energy-storage density (<em>W</em>_rec) and efficiency (<em>η</em>) at moderate electric fields. To address this issue, a novel class of (1-<em>x</em>)(Na_0.5Bi_0.5)_0.75Sr_0.25TiO₃-<em>x</em>(K_0.5Ag_0.5)_0.97Bi_0.01NbO₃ (NBST-<em>x</em>KABN, <em>x</em> = 0, 0.05, 0.10 and 0.15) relaxor ferroelectric ceramics are designed and synthesized in this work. K⁺-Bi³⁺ ion pairs are introduced into NBST-<em>x</em>KABN ceramics to alter charge distribution and destroy local structural symmetry of A-site. Thereby, large saturation polarization is maintained, which assists in energy storage at lower electric fields and minimizing the likelihood of aging failure in energy-storage devices that operate at high electric fields. Moreover, the incorporation of KABN strengthens breakdown strength of ceramics via reducing grain size and improving density and electrical uniformity (simulated by COMSOL). Along with the enhanced relaxor behavior induced by compositional inhomogeneity and ionic disorder, NBST-0.10KABN ceramics synchronously obtain <em>W</em>_rec of 5.3 J/cm³ and high <em>η</em> of 90.0 % at a moderate electric field of 330 kV/cm. The optimum composition also exhibits satisfactory temperature (30–130 °C) and frequency (1–100 Hz) stability, accompanied by large power density (<em>P</em>_D) of 38.2 MW/cm³ and rapid discharge rate <em>t</em>_0.9 of 34.8 ns. This work offers an achievable tactic to develop dielectric ceramics with remarkable comprehensive energy-storage properties at moderate electric fields, so as to satisfy requirements of energy-storage capacitors in harsh circumstances.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101657"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Metal ion mediated conductive hydrogels with low hysteresis and high resilience","authors":"Zhiwei Chen ,&nbsp;Xionggang Chen ,&nbsp;Haidong Wang ,&nbsp;Tingting Yang ,&nbsp;Jinxia Huang ,&nbsp;Zhiguang Guo","doi":"10.1016/j.mtphys.2025.101656","DOIUrl":"10.1016/j.mtphys.2025.101656","url":null,"abstract":"<div><div>Conductive hydrogels with poor mechanical properties seriously limit the service life of sensors and flexible electronics. Outstanding mechanical properties and electrical conductivity are the bottleneck of the application of conductive hydrogels. To combined excellent elasticity and electronic conductivity, herein, a new method was employed to achieve elastic dissipation with low hysteresis via introduce metal ions crosslinking, thereby enhancing mechanical dissipation of polymer network. Specifically, acrylamide (AAm) is a monomer in the covalent network via free radical polymerization. Sodium alginate (SA) form metal coordination bonds with Fe³⁺, Zn²⁺ and Ca²⁺. Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT: PSS) is selected to be a conductive polymer. The resultant AAm/SA/PEDOT: PSS (ASP) hydrogels exhibit low hysteresis, high resilience and excellent electronic conductivity. Metal coordination bonds not only provide high elasticity as elastic dissipation energy, but also enhance electrical conductivity. The ASP hydrogels display combined mechanical performances with elastic modulus (550 MPa), fracture strength (0.81 MPa), fracture strain (473 %) and work of rupture (3.13 MJ/m³), and outstanding electronic conductivity (0.32 S/cm) which has great potential for extending the service life of hydrogels.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101656"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143021094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tunable high spin Chern-number insulator phases in strained Sb monolayer","authors":"Jacob Cook ,&nbsp;Po-Yuan Yang ,&nbsp;Theo Volz ,&nbsp;Clayton Conner ,&nbsp;Riley Satterfield ,&nbsp;Joseph Berglund ,&nbsp;Qiangsheng Lu ,&nbsp;Rob G. Moore ,&nbsp;Yueh-Ting Yao ,&nbsp;Tay-Rong Chang ,&nbsp;Guang Bian","doi":"10.1016/j.mtphys.2025.101664","DOIUrl":"10.1016/j.mtphys.2025.101664","url":null,"abstract":"<div><div>High spin Chern-number insulators (HSCI) have emerged as a novel 2D topological phase of condensed matter that is beyond the classification of topological quantum chemistry. The HSCI phase with two pairs of gapless helical edge states is robust even in the presence of spin–orbit coupling due to the protection of a “hidden” feature spectrum topology. In this work, we report the observation of a semimetallic Sb monolayer carrying the same band topology as HSCI with the spin Chern number equal to 2. Our calculations further indicate a moderate lattice strain can make Sb monolayer an insulator or a semimetal with a tunable spin Chern number from 0 to 3. The results suggest strained Sb monolayers as a promising platform for exploring exotic properties of the HSCI topological matter.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101664"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and regulation of electromagnetic parameters of THz absorbing epoxy resin composite film for 6G electronic packaging","authors":"Yunbo Guo ,&nbsp;Zhuo Wang ,&nbsp;Siyi Bi ,&nbsp;Qi Sun ,&nbsp;Yinxiang Lu","doi":"10.1016/j.mtphys.2025.101655","DOIUrl":"10.1016/j.mtphys.2025.101655","url":null,"abstract":"<div><div>Flexible electrically insulating packaging materials with high absorption performance are urgently indispensable in the wide applications for 6G electronic devices. Herein, direct modification of KH550 and low-filler loading of mSiO₂ are proposed to construct enhanced epoxy resin (EP) composite film. The resultant EP-F sample achieves an average total shielding effectiveness (SE_T) of 15.11 dB (0.2–2.5 THz) at a thickness of 1 mm, representing a 142 % improvement over the EP sample. At a thickness of 1.8 mm, EP-F exhibits effective THz wave absorption across 0.5–2.5 THz frequency range, with an average reflection loss (RL) value of −14 dB. The dielectric behavior and THz wave absorption of the KH550- and mSiO₂-modified EP samples were analyzed through dielectric constant spectra and Cole-Cole plots for the first time, elucidating the distinction and relationship between microwave-like polarization and infrared-like absorption mechanisms in polar dielectric polymer materials within the THz range. Moreover, the EP-F sample exhibits enhanced mechanical properties and thermal stability, with a volume resistivity of 8.75 × 10¹² Ω cm and a breakdown field strength of 37.59 kV/mm. Finally, the potential application of EP-F in practical THz circuit board packaging was demonstrated through Finite difference time domain (FDTD) simulation modeling. The enhanced epoxy resin material demonstrates enormous promise for in-situ shielding and packaging of THz devices, fabrication of efficient wave-absorbing layers, and various future applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101655"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143026757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ loaded PPy hydrogel for efficient atmospheric water harvesting without any energy consumption","authors":"Danyan Zhan ,&nbsp;Changhui Fu ,&nbsp;Zhengting Yu ,&nbsp;Guangyi Tian ,&nbsp;Yuxuan He ,&nbsp;Xionggang Chen ,&nbsp;Zhiguang Guo","doi":"10.1016/j.mtphys.2025.101658","DOIUrl":"10.1016/j.mtphys.2025.101658","url":null,"abstract":"<div><div>Hygroscopic salt-hydrogel-based atmospheric water harvesting (HAWH) technology represents an auspicious approach to alleviating the water crisis, as it is not limited by factors such as climactic. Reducing hygroscopic salt leakage is of the utmost importance to maintaining the technology's consistent performance. Consequently, we have developed a composite hygroscopic material (PPy-AAC-LiCl) with in situ loaded polypyrrole (PPy) as a photothermite. The in-situ loading of PPy not only achieves the photothermal performance of PPy-AAC-LiCl but also enhances the hygroscopic performance, which is due to the presence of nitrogen atoms in the structure facilitating the formation of hydrogen bonds between water molecules, and reduces the leakage of hygroscopic salts attributed to its ability to inhibit the increase in pore size after hygroscopicity of PPy-AAC-LiCl. The experimental results show that PPy-AAC-LiCl has effective hygroscopic performance at relative humidity (RH) of 30 %–90 %. The hygroscopicity at 25 °C and RH 70 % was about 1.53 g_water g_adsorbents⁻¹ after 12 h. After ten hygroscopicity-desorption cycles, the hygroscopicity of the samples did not decrease significantly, and no white crystals appeared on the surface of the samples during the desorption process. Furthermore, PPy-AAC-LiCl demonstrated effective atmospheric water harvesting capabilities in outdoor trials, exhibiting a desorption rate of 87.6 % and a moisture absorption rate of 1.26 g_water g_adsorbents⁻¹. The preparation of this simple and environmentally friendly hygroscopic composite material lays the foundation for the future development of atmospheric water materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101658"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143020891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Screening of promising thermoelectric materials from MnTe-GeTe alloying","authors":"Tiantian Wang ,&nbsp;Quansheng Guo ,&nbsp;Jianghe Feng ,&nbsp;Juan Li ,&nbsp;Ruiheng Liu","doi":"10.1016/j.mtphys.2025.101661","DOIUrl":"10.1016/j.mtphys.2025.101661","url":null,"abstract":"<div><div>GeTe-MnTe-based materials have been proposed as promising thermoelectric materials due to the ineluctable phase transition of GeTe materials. However, the previously reported Ge_1-<em>x</em>Mn_<em>x</em>Te alloys with low MnTe content may mix with the rhombohedral phase of GeTe, making the sample unstable during thermal cycling. Moreover, the exact phase of GeTe-MnTe-based alloys have not been thoroughly studied. In this work, a series of Ge_1-<em>x</em>Mn_<em>x</em>Te (0 ≤ <em>x</em> ≤ 1) compounds were synthesized, and the changes in crystal structure and thermoelectric properties were investigated across the composition range from GeTe to MnTe. At the phase boundary, both rhombohedral and cubic phases GeTe coexist in the range of <em>x</em> = 0.15 to 0.3, while cubic phase GeTe and hexagonal MnTe phases coexist for <em>x</em> = 0.5 to 0.7. The single cubic phase is observed only near <em>x</em> = 0.4. Alloying with MnTe significantly increase the effective mass of the electronic band, which negatively impacts the electrical performance, suggesting that the thermoelectric properties are compromised in favor of enhancing the stability of the GeTe structure. Although the resistivity of the alloy increases with Mn content, the Seebeck coefficient rises significantly, and thermal conductivity decreases. These changes are likely due to enhanced phonon scattering caused by the two phases and the Mn solute atoms. As a result, relatively high figure-of-merit (<em>zT</em>) values are achieved in the rhombohedral-to-cubic phase transition region (<em>x</em> = 0.15, 0.2, 0.3) for Ge_1-<em>x</em>Mn_<em>x</em>Te.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101661"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on field-induced sign reversal of planar Hall effect in intrinsic ferromagnetic topological insulator MnBi8Te13","authors":"Qingwang Bai,&nbsp;Mingxiang Xu,&nbsp;Guangdong Li","doi":"10.1016/j.mtphys.2025.101666","DOIUrl":"10.1016/j.mtphys.2025.101666","url":null,"abstract":"<div><div>The intrinsic ferromagnetic topological insulators MnBi₈Te₁₃ provide a promising material platform for the realization of diverse exotic topological quantum states, such as quantum anomalous Hall effect and axion-insulator state. The planar Hall effect (PHE) has significant advantages for the characterization of intrinsic magnetic properties in magnetic materials and applications to spintronic devices, due to its low thermal drift and high signal-to-noise ratio. In this work, the PHE of single crystal intrinsic ferromagnetic topological insulator MnBi₈Te₁₃ is studied in detail for the first time. Consistent with most PHE studies, the resulting PHE data demonstrate peaks and valleys near nπ/4 (n = 1, 2, 3, and 4) indicating a period of π. Interestingly, we observed a field-induced sign reversal of the PHE. Anisotropic magnetoresistance (AMR) measurements show that the sign reversal of resistivity can be attributed to the different dependence of resistivity on the magnetic field when the field is parallel and perpendicular to the current direction. Further analysis of the PHE and AMR data has demonstrated that the anisotropic magnetoresistance, rather than the chiral anomaly, plays a dominant role in the PHE of MnBi₈Te₁₃. These results advance the understanding of the planar Hall effect and provide a candidate material for field-controlled magnetic sensor devices.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101666"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Planar hybrid UV-C photodetectors based on aerosol-jet printed PEDOT:PSS on different Ga2O3 thin films","authors":"F. Mattei ,&nbsp;D. Vurro ,&nbsp;D. Spoltore ,&nbsp;M. Pavesi ,&nbsp;P. Rajabi Kalvani ,&nbsp;S. Pasini ,&nbsp;G. Foti ,&nbsp;P. D'Angelo ,&nbsp;A. Bosio ,&nbsp;A. Baraldi ,&nbsp;F. Mezzadri ,&nbsp;P. Mazzolini ,&nbsp;S. Vantaggio ,&nbsp;M. Bosi ,&nbsp;L. Seravalli ,&nbsp;G. Tarabella ,&nbsp;A. Parisini ,&nbsp;R. Fornari","doi":"10.1016/j.mtphys.2025.101663","DOIUrl":"10.1016/j.mtphys.2025.101663","url":null,"abstract":"<div><div>Ultra-wide bandgap semiconductors like Ga₂O₃, presenting intrinsic spectral selectivity in the UV-C region of the electromagnetic spectrum, are especially well suited for application as solar-blind photodetectors. In this work, photodiodes based on a planar hybrid heterojunction between Ga₂O₃ and an organic semiconductor are fabricated.</div><div>Specifically, the photodetectors consist of layers of nominally undoped β-Ga₂O₃, κ-Ga₂O₃, amorphous Ga₂O₃ or Si-doped κ-Ga₂O₃ over which an ink based on heavily doped PEDOT:PSS is directly deposited by aerosol-jet printing. Optimization of the latter process is pursued, ensuring the minimization of overspray and ill-defined features over all the tested layers, especially on the amorphous one, which was found to be the most compatible with this deposition technique.</div><div>After characterization of the fabricated devices electrical and optoelectronic properties, β-Ga₂O₃ presents the best lower-bound estimate values of peak responsivity, external quantum efficiency, and a specific detectivity of 4.5⋅10⁻² A/W, 23 % and 3.2⋅10¹² Jones respectively, at a wavelength (<em>λ</em>) of 240 nm, along with a UV-C/visible (<em>λ</em> = 240/400 nm) rejection ratio of 1.6·10³. However, as the sputtering deposition process is scalable and inexpensive compared to epitaxial crystal growth, amorphous Ga₂O₃ emerges as a cost-effective alternative to β-Ga₂O₃ for solar-blind photodetection.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"51 ","pages":"Article 101663"},"PeriodicalIF":10.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}