APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jing Zhou,Li Gao,ShengWen Yang,Zhenming Qu,Yu Cao,Jinbo Pang,Jian Ni,Jianjun Zhang
Germanous selenide (GeSe) is an emerging photoactive layer material due to its excellent photoelectric properties, low cost and environmental friendliness. However, severe carrier recombination in the GeSe photoactive layer remains a significant factor limiting the conversion efficiency of GeSe solar cells. In this study, the GeSe photoactive layers were doped copper chloride (CuCl 2 ) solution, enabling the distribution of Cu 2+ ions throughout the layer, primarily accumulating on the GeSe grain surface. Its impact on the carrier transport in the GeSe photoactive layer was studied by ultraviolet photoelectron spectroscopy, kelvin probe force microscopy, and transient photovoltage. The doping can not only increase the Fermi level of the GeSe, but also adjust the local built-in potential on grain boundaries, so that the charge carriers can be redistributed in the three-dimensional space. Notably, at the grain boundaries, the hole flow before doping changes to electron flow, effectively reduces the recombination probability of charge carriers, and increases the carrier lifetime from 200.23 to 374.57 μs. As a result, the conversion efficiency after processing with CuCl 2 is increased from 1.98 % to 3.01 %. This study provides a reference for understanding the carrier kinetics in GeSe solar cells to improve the photoelectric conversion performance of the device.
研究领域:
材料科学
·
光伏技术
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2020
·
IF 10.443
J. Xing,Y. Zou,C. Zhao,Z. Yu,Y. Shan,W. Kong,X. Zheng,X. Li,W. Yu,C. Guo
Carrier transfer is a key process for perovskite-based photoelectric conversion. It has a close relationship with grain boundaries, grain size , and contact layers. Understanding this relationship is of great significance for revealing the inherent characteristics of perovskite materials and for devices optimization. However, the dependence of carrier transfer characteristics (including carrier lifetime and mobility) on thickness is less studied, although which is a key issue for almost all perovskite material devices. Here we find that as the thickness of MAPbBr 3 perovskite single crystal (PSC) increases from 1.47 μm to 10.55 μm, the carrier lifetime of MAPbBr 3 decreases from 70 ns to 30 ns, and the carrier mobility decreases from 97 cm 2 V −1 s −1 to 57 cm 2 V −1 s −1 , but they become constant in very thick samples. In addition, it was found that as the crystal thickness increased from 1.47 μm to 10.55 μm, the surface layer range gradually increased from 12 nm to 31 nm. The surface recombination velocity and surface defect (trap) density further confirmed that the thin PSC exhibited a small surface layer range. Finally, a three-layer carrier transmission model of PSC is proposed. This research provides guidance for the optimal design of PSC optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Dong Liu,Xianyuan Jiang,Hao Wang,Hao Chen,Ying-Bo Lu,Siyu Dong,Zhijun Ning,Yong Wang,Zhongchen Wu,Zongcheng Ling
Perovskite single crystals have attracted tremendous attention owing to their excellent optoelectronic properties and stability compared to typical multicrystal structures. However, the growth of high-quality perovskite single crystals (PSCs) generally relies on temperature gradients or the introduction of additives to promote crystal growth. In this study, a vacuum evaporation crystallization technique is developed that allows PSCs to be grown under extremely stable conditions at constant temperature and without requiring additives to promote crystal growth. The new method enables the growth of PSCs of unprecedented quality, that is, MAPbBr 3 single crystals that exhibit an ultranarrow full width at half maximum of 0.00701°, which surpasses that of all previously reported values. In addition, the MAPbBr 3 single crystals deliver exceptional optoelectronic performance, including a long carrier lifetime of 1006 ns, an ultralow trap-state density of 3.67 × 10 9 cm −3 , and an ultrahigh carrier mobility of 185.86 cm 2 V −1 s −1 . This method is applicable to various types of PSCs, including organic–inorganic hybrids, fully inorganic structures, and low-dimensional structures.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Senlin Leng,Shibo Guan,Yingying Xu,Hongzhang Song,Mengyao Li,Haoshan Hao
Bi 2 Sr 2 Co 2 O y has good thermoelectric performance, but it still has wide room for further improvement. In this study, the (Ba 0.15 Pb 0.15 Ag 0.1 Na 0.2 Cu 0.2 Bi 1.2 )Sr 2 Co 2 O y high-entropy sample was prepared by the Bi 2 Sr 2 Co 2 O y pristine sample and the multi-element doping in Bi cite. On the one hand, the carrier concentration and carrier mobility of the high-entropy sample increase, so its electrical transport performance is improved greatly. On the other hand, due to the high disorder introduced by the multi- element doping, the phonon scattering is enhanced, and the thermal conductivity of the high-entropy sample is suppressed significantly. Finally, at 923 K, the ZT value (the dimensionless thermoelectric figure of merit) of the high-entropy sample reaches 0.26, which is about 1.9 times higher than that of the pristine sample.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
·
热电转换
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Minghong Rui,Xiaokang Lu,Yuan Li,Sanmin Liu,Xiuhong Jin,Sumei Wang
Antimony sulfide (Sb2S3) has emerged as a promising photoactive material due to its high light absorption capability. However, the organic Spiro-OMeTAD hole transport layer (HTL) poses a severe challenge to highly efficient Sb2S3 solar cells because of its high cost and poor stability. To address these issues, a MnS–PbS composite HTL was fabricated via the coevaporation process for the first time. By tuning the MnS:PbS ratio, the microstructure, carrier transport, and energy band alignment at the Sb2S3/ MnS–PbS interface were optimized. The high carrier mobility of PbS films and the high carrier concentration of MnS films enabled the MnS–PbS composite HTL possessing the superior conductivity. Devices employing the optimized MnS–PbS HTL achieved a champion power conversion efficiency of 6.60%, with significant improvements in short-circuit current, fill factor, and photostability due to the enhanced hole transport, suppressed recombination, and reduced photocurrent loss. This facile coevaporated composite HTL demonstrates a significant potential for efficient fully inorganic Sb2S3 solar cells.
研究领域:
光伏技术
·
材料科学
·
半导体器件
·
薄膜技术
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 10
·105202
·
IF 3.399
Miao Hu,Aihua Yan,Ji Huang,Fei Huang,Fan Li,Qiaopeng Cui,Qi Li,Xinyang Wang
In the last ten years, bismuth oxybromide (BiOBr) has attracted wide attention due to its superior optoelectronic property. However, its practical application still suffers from slow carrier transport and high carrier recombination. Here we report a kind of novel tannum indium sulfide (SnIn4S8)/BiOBr hybrid prepared by a two-step hydrothermal method. The results showed that small amount of SnIn4S8 had no influence on the crystal phase of BiOBr, but the morphology could be regulated from nanosheet to nanoflower. Specially, SnIn4S8 exerted a slight effect on the light absorption and band gap of BiOBr. Importantly, SnIn4S8/BiOBr hybrids exhibited remarkable enhancement of the photocatalytic activity towards the degradation of rhodamin B (RhB) dye molecules. SnIn4S8/BiOBr-0.20 with 99.8% degradation efficiency had the highest photocatalytic activity within 40 min, while it was only 71.1% for pure BiOBr. The enhanced photocatalytic activity was mainly attributed to efficient interfacial transfer and low carrier recombination. This work will help us understand the photocatalytic mechanism of bismuth oxyhalide hybrids.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 5
·460
·
IF 4
Yameng Wang,Ao Xu,Jihui Lang,Bin Zuo,Zihan Yu,Keyu Cui,Xuefei Li,Kewei Zhang,Xin Li,Maobin Wei,Jian Cao
CO2photoreduction technology offers significant potential for addressing energy and environmental challenges, though its practical application is hindered by insufficient photo-absorption and rapid carrier recombination. Herein, we constructed the WO3/In2S3S-scheme heterojunction through hydrothermal assembly of two-dimensional WO3nanosheets and scale-like In2S3nanoflakes. Systematic characterization via XRD, XPS, SEM, and TEM verified the successful preparation of hierarchical nanostructures with optimized interfacial contact in the WO3/In2S3composites. UV-Vis DRS analysis showed that the photo-absorption range of the catalyst was significantly widened. Photoelectrochemical investigations (EIS, TPR, PL, and LSV) revealed enhanced carrier separation efficiency and reduced recombination kinetics in the heterojunction system. The optimized WO3/In2S3(WI-60) catalyst had a CO evolution efficiency of 55.14 μmol·g−1under the UV-Vis light, representing a 3.9-fold enhancement over the pure In2S3(14.08 μmol·g−1). Mechanistic studies through the XPS and band-structure analysis confirmed the establishment of an S-scheme carrier’ transfer pathway, which simultaneously preserved strong redox potentials and promoted the separation process of carriers. This research provides a validated strategy for developing efficient S-scheme photocatalytic systems for solar fuel generation.
研究领域:
材料科学
·
环境科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 6
·2508
·
IF 4.6
Hong Qiu,Xiaohui Ma,Hongxia Fan,Yueyan Fan,Yajie Li,Hualei Zhou,Wenjun Li
Molybdenum-based cocatalyst being used to construct heterojunctions for efficient photocatalytic H2production is a promising research hotspot. In this work, CdIn2S4was successfully closely supported on bulk Mo2C via the hydrothermal method. Based on their matching band structures, they formed a Type Ⅰ heterojunction after the combination of Mo2C (1.1 eV, −0.27 V, 0.83 V) and CdIn2S4(2.3 eV, −0.74 V, 1.56 V). A series of characterizations proved that the heterojunction composite had higher charge separation efficiency compared to a single compound. Meanwhile, Mo2C in heterojunction could act as an active site for hydrogen production. The photocatalytic H2production activity of the heterojunction composites was significantly improved, and the maximum activity was up to 1178.32 μmmol h−1g−1for 5Mo2C/CdIn2S4composites. 5Mo2C/CdIn2S4heterojunction composites possess excellent durability in three cycles (loss of 6%). Additionally, the mechanism of increased activity for composites was also investigated. This study provides a guide to designing noble-metal-free photocatalyst for highly efficient photocatalytic H2evolution.Keywords:noble-metal-free;Mo2C;CdIn2S4;heterojunction;carrier separation
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Xinghai Han,Guihong Song,Shuang Yang,Yusheng Wu,Junhua You
Mg 3 Bi 2 /Mg 2 Sn nanocomposite films were prepared on single Si substrate using high pure metal Mg, Mg 3 Bi 2 and Mg 2 Sn target by alternately sputtering. The phase composition of the deposited Mg 3 Bi 2 /Mg 2 Sn films was analyzed by X-ray diffraction patterns. The surface and cross-sectional morphology of the deposited Mg 3 Bi 2 /Mg 2 Sn films was observed by scanning electron microscope. The content and distribution of elements in the deposited Mg 3 Bi 2 /Mg 2 Sn films were measured by an energy dispersive spectroscopy. The Seebeck coefficient and electrical conductivity of the deposited films was measured by Seebeck coefficient/resistance analysis system. The carrier concentration and carrier mobility of the sample was measured and calculated by Hall experiments. Results showed that the Mg 3 Bi 2 /Mg 2 Sn films were composed of Mg 3 Bi 2 , Mg 2 Sn and a few of metal Mg phase. The carrier (hole) concentration and Seebeck coefficient gradually increased, but the mobility and electrical conductivity decreased with increasing the Mg 2 Sn phase content in deposited films. As a result of the competition between the electrical conductivity and the Seebeck coefficient, the power factor first increased, reached a maximum value of 1.20 mW·m −1 ·K −2 at 155 °C, and then decreased. The deposited Mg 3 Bi 2 /Mg 2 Sn nanocomposite films with 6.5 at.% Sn possessed the highest power factor in measured temperature range. The power factor of deposited Mg 3 Bi 2 films can be effectively improved by adding moderate Mg 2 Sn phase and forming Mg 3 Bi 2 /Mg 2 Sn nanocomposite films.
研究领域:
材料科学
·
热电学
·
纳米技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Zhuogen Li,Xinyao Xu,Rui Ma,Zhaoxiong Xie,Qin Kuang
Semiconductor photocatalysis is severely constrained by sluggish photogenerated carrier dynamics, especially under high-temperature conditions inherent to photo-thermal coupled catalysis. Herein, using ferroelectric PbTiO 3 (PTO) as example, a synergistic bulk-surface engineering strategy that integrates polarization amplification with surface carrier confinement to address this challenge is reported. Through hydrothermal synthesis, Pt 2 ⁺ is incorporated into the PTO lattice by partially substituting Ti⁴⁺ sites, which not only enhances PTO's intrinsic polarization but introduces impurity energy levels, jointly suppressing bulk carrier recombination. Critically, the incorporation of Pt elevates the Curie temperature of PTO from 550 to 650 °C, stabilizing its ferroelectric properties under high-temperature environments. Leveraging PTO's polarization-induced charge migration, two co-catalysts are selectively photodeposited on opposite (001) facets of Pt-doped PTO, realizing spatial isolation of surface carrier trappers to inhibit surface carrier recombination. A detailed carrier dynamics study demonstrated this elaborated bulk-surface engineering dramatically prolongs the average photocharge lifetime, while Pt doping-mediated interfacial barrier reduction promotes high surface carrier localization. Consequently, the optimized PR-Au/MnO x -2%-PTPO exhibits exceptional photo-thermal coupled catalytic CO 2 hydrogenation performance at 550 °C, with CO production rate reaching 235.7 mmol·g −1 ·h −1 , ≈6.6 times that of pure PTO. This study establishes a novel modulation paradigm for ferroelectric semiconductors in efficient energy conversion.
研究领域:
材料科学
·
催化化学
·
能源化学
·
半导体物理
·
环境科学
·
纳米科技
·
表面科学
✓ 已验证
DOI
高影响因子
ACTA MATERIALIA
·
2024
·
IF 8.3
Fanshi Wu,Yifan Shi,Wanjia Zhang,Wei Zhao,Hao Yang,Wenxin Lai,Yue Lou,Zhenhua Yan,Zhan Shi,Zhenhua Ge,Xiyang Wang,Liangwei Fu,Biao Xu
Sub-nanomaterials possess unprecedented size-dependent properties compared to conventional nanomaterials, which endow them with great potential in catalysis, biomedicine, sensors, and so on. However, their applications in thermoelectrics are unknown due to poor thermal stability and low yields. Herein, we construct a series of thermoelectric composites by incorporating highly thermally stable and commercial fullerene sub-nanoclusters (C 60 or C 70 ). We find that sub-nanoclusters as the second phase can conduce to optimized carrier concentration through charge transfer at interfaces while the carrier mobility is significantly enhanced due to atom orbital hybridization and size-dependent electrical scattering mechanism. Furthermore, the ultra-low thermal conductivity of C 60 due to its distorted chemical bonding and sub-nanometer pore, and the interfacial thermal resistance greatly suppress the phonon transport. Consequently, the 0.15 mol.% C 60 /Bi 0.4 Sb 1.6 Te 3 realizes an ultra-high ZT of ∼1.6 at 373 K, an excellent thermoelectric conversion efficiency of ∼7.4 %, and a huge cooling performance of ∼73 K. This work demonstrates the application of sub-nanomaterials in thermoelectrics and may shed light on other fields such as electronic devices, thermal management, and fullerene chemistry.
研究领域:
材料科学
·
热电学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Shenyan Zhou,Lianqing Yu,Qianlong Yang,Chong Liu,Wenjing Xie,Kehui Xue,Zhe Li,Yaping Zhang,Haifeng Zhu
The production of hydrogen via the photolysis of water represents a sustainable and environmentally benign approach to energy generation, which has the potential to mitigate energy shortages and environmental degradation. Nonetheless, the efficiency of photocatalysts is significantly limited by the effectiveness of charge carrier separation. Reducing the diffusion distance of these carriers can enhance their overall performance of the photocatalyst. In this context, a composite photocatalyst comprising CuNi 2 S 4 and ZnCdS was synthesized through one-step hydrothermal process. This bulk-phase heterojunction increases the nano-contact areas while maintaining an interface distance that is smaller than the diffusion distance of the carriers. Consequently, the optimal hydrogen production rate achieved was 33.87 mmol/g h, which is an order of magnitude greater than that of pure ZnCdS at 3.35 mmol/g h. Furthermore, the quantum efficiency at 400 nm reached 16 %. The photocurrent of the ZCS-CNS-3 % sample was 57.1 μA/cm², 4.35-fold of pure ZnCdS at 13.1 μA/cm². The incorporation of CuNi 2 S 4 significantly reduces the overpotential required for hydrogen evolution, while concurrently reducing the carrier transfer resistance by an order of magnitude. This bulk-phase structure not only broadens the prospects for the advancement of green and clean energy solutions but also enhances the methodologies for synthesizing nano-contact photocatalysts.
研究领域:
材料科学
·
能源研究
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）