CRYSTENGCOMM
·
2019
·Vol. 22
·期 1
·68-73
·
IF 3.382
Junli Wang,Fan Guan
Antimony selenide (Sb2Se3) is a low-toxic, element-abundant, narrow bandgap (Eg = ∼1.1–1.3 eV) semiconductor that shows potential for UV-Visible-Near-infrared optoelectronic applications. This paper reports the use of potassium selenocyanate (KSeCN) as a novel molecular selenium source to synthesize Sb2Se3 uniform nanorods. The resulting nanorods have been carefully characterized and are found to exhibit decent photoconductivity as well as broad-spectrum optical absorption with an Eg value of ∼1.35 eV. A molecular reaction mechanism is rationally proposed and evidenced for forming Sb2Se3, which is related to the thermal decomposition of selenocyanate (SeCN−) anions through the cleaving of Se–CN bonds to elemental Se(0), followed by its reduction to Se2− anions. Our work using KSeCN offers an alternative method for the synthesis of metal selenides with desirable nanostructures and properties.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiao Wu,Peng Wang,Xingan Jiang,Shuyao Cao,Jinfeng Lin,Rui Xiong,Zhenhuan Zheng,Min Gao,Chunlin Zhao,Tengfei Lin,Cong Lin,Baisheng Sa
Photoferroelectrics that involve strong light-matter coupling are regarded as promising candidates for realizing bulk photovoltaic and photoelectric effects via light absorption. Nonetheless, understanding the photoresponse mechanism or modulation of performance from a microscopic point of view is scarcely explored through quantification of macroscopic properties. Herein, we design a model material, Gd3+-doped (K0.5Na0.5)NbO3 ferroelectric-transparent ceramics, and present an advantageous strategy to enhance the optoelectronic coupling through joint modulations of lattice distortion and oxygen vacancies, along with inner defects and ferroelectric domains. Significantly, their microcosmic manipulation can be intuitively and facilely evaluated by the optical transparency of each ceramic. An approximately 104 fold increase in conductivity under ultraviolet irradiation was produced. Under the cocoupling between external physical fields, the synergy of photoelectric stimulation increased the photoconductivity of the ceramics by 13.89 times. Additionally, a significant increase (4.5-fold) in the current output from the photovoltaic effect was achieved via ferroelectric domains of moderate size, whose size could be easily assessed by optical transmittance. In situ microscopic observations confirmed that the configuration of oxygen vacancy-dependent ferroelectric domains contributes to the enhanced optoelectronic response. This research provides a distinct way to develop inexpensive optocoupler devices and meet the requirements for multifunctional integration in single photoferroelectrics.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Zhiyuan Zuo,Jianxu Ding,Yongfu Li,Ying Zhao,Songjie Du
Organic–Inorganic hybrid perovskites attract intensive attentions due to significant optoelectronic performances. However, abnormal phenomena such as photocurrent hysteresis and slow photoconductivity response caused by ion migration made ionic transportation properties to be a hot topic in this area. Thinking of serious influences such as efficiency decay of excited carrier separation and poor reliability are caused by ion migration, systematical research on this topic is still highly demanded. Here, anisotropic ionic transportation performances of (100) and (112) planes in MAPbI 3 single crystal have been investigated with various photon excitation conditions. Enhanced ionic conductance had been extracted on (112) plane both with and without illuminations. Comparing to exponential saturation revealed by the electrons, the ionic conductance exhibits a linear increase trends with incident light power in MAPbI 3 .
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 16
·165702
·
IF 3.573
Chengrong Wei,Yongxiao Bai,Aiying Deng,Yan Bao
Iron diselenium (FeSe2) is a promising semiconductor for thin-film solar cells because it has a suitable band gap (Eg = 1.0 eV) and high absorption coefficient. Despite these prospects, the controllable synthesis of FeSe2 nanostructures and the diversity of their geometries has hardly been studied previously. Here, we described a successful synthesis of phase-pure, high-quality, and stable orthorhombic FeSe2 nanocrystals (NCs) in aqueous solvents. A variety of morphologies of the FeSe2 NCs were achieved by adjusting synthetic methods. FeSe2 nanoparticles with diameters of 30–100 nm were synthesized in the presence of ethylenediamine (en). Moreover, the synthetic approach developed for nanoparticles proved to be quite universal and could be modified to produce nanowires and octahedrons, with which structure the material could display high crystallinity. The diameter of the FeSe2 nanowires was 300–500 nm with a length exceeding 2 μm. The octahedrons displayed lateral dimensions of 1 μm. Meanwhile, the probable growth mechanism and fabrication process of the NCs were proposed. Polycrystalline FeSe2 thin films were fabricated by modifying the sedimentation method. The obvious photoconductivity of FeSe2 has already been observed, and it was considered to be one candidate of solar cell for the very first time.
研究领域:
材料科学
·
纳米技术
·
半导体物理
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 24
·7583-7590
·
IF 7.393
Li Jiang,Huihuang Huang,Fubing Gui,Yalun Xu,Qianqian Lin
In recent years, AgBiS2 has received great attention in optoelectronics thanks to its fascinating merits, including a suitable bandgap, large absorption coefficient from ultraviolet to near-infrared and remarkable material stability. However, the poor carrier transport properties limit its further development and applications. To address this issue, we propose a composite strategy to facilitate the carrier transport of AgBiS2 QD films. The AgBiS2–organic hybrid films demonstrated enhanced photoconductivity. Then, we fabricated phototransistors based on these blend films, and achieved a high photosensitivity (Ilight/Idark) of 1.5 × 103, a decent responsivity of up to 20 A W−1, an excellent specific detectivity of 4 × 1013 Jones under low UV illumination and remarkable device stability. These results again demonstrate the great potential of AgBiS2 for next generation solution-processed photodetectors.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Junli Wang,Hongsong Yu,Tingting Wang,Yajie Qiao,Ying Feng,Kangmin Chen
The chemical composition, size and shape, and surface engineering play key roles in the performance of electronic, optoelectronic, and energy devices. V2VI3 (V = Sb, Bi; VI = S, Se) group materials are actively studied in these fields. In this paper, we introduce a colloidal method to synthesize uniform ternary (BixSb1–x)2S3 (0 < x < 1) nanorods. These nanorods show composition-dependent aspect ratios, enabling their composition, size, and shape control by varying Bi/Sb precursor ratios. It is found that the surface passivation by various thiols (L–SH) efficiently enhances the photoconductivity and optical responsive capability of (BixSb1–x)2S3 nanorods when used as active materials in indium tin oxide (ITO)/(BixSb1–x)2S3/ITO optoelectronic devices. Meanwhile, the increase of Sb content causes a gradual deterioration of photoconductivity of thiol-passivated nanorods. We propose that the thiol passivation is able to reduce the number of S vacancies, which act as the recombination centers (trapped states) for photogenerated electrons and holes, and thus boosts the carrier transport in (BixSb1–x)2S3 nanorods, and in particular that the composition-related conductivity deterioration is attributed to the increase of unpassivated S vacancies and surface oxidation due to the rise of Sb content.
研究领域:
材料科学
·
光电材料
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Junli Wang,Linjie Li,Hongsong Yu,Fan Guan,Dan Wang
Nanoscale chemical transformations based on partial cation exchange reactions are known as a component-increased, shape-maintaining means for the design and tunable preparation of ternary or multinary metal chalcogenide compounds. Herein, we present a new material couple, Bi2S3–AgBiS2, to detail the binary–ternary chemical transformation via partial cation exchange and its reaction thermodynamics and kinetics. The preformed Bi2S3 nanorods (NRs) act as both the reactant and the parent template, within which the partial exchange of Bi3+ with Ag+ cations proceeds under a silver-rich, diffusion-controlled regime, leading to the formation of energetically favorable AgBiS2. The NR shape preservation involving sulfur sublattice rearrangement is due to the proper diameter thickness (∼12 nm) of parent Bi2S3 NRs and the rapid establishment of equilibrium-phase AgBiS2, as supported by X-ray diffraction measurements and the pseudobinary Ag2S–Bi2S3 phase diagram. Interestingly, the finding of a AgBiS2–Bi2S3–AgBiS2 intermediate with axially segmented heterostructures reveals the real NR-to-NR conversion trajectory and the shape-induced exchange reaction anisotropy at the ends and middle of Bi2S3 NRs. Additionally, the resultant AgBiS2 NRs with a measured band gap of ∼0.86 eV exhibit potential for photoelectronic applications because of their impressive visible–near-infrared absorption and photoconductivity.
研究领域:
材料科学
·
化学
·
纳米技术
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Huiyao Shi,Minglin Li,Jialin Shi,Dindong Zhang,Zhen Fan,Mingjun Zhang,Lianqing Liu
Inverse photoconductance is an uncommon phenomenon observed in selective low-dimensional materials, in which the electrical conductivity of the materials decreases under light illumination. The unique material property holds great promise for biomedical applications in photodetectors, photoelectric logic gates, and low-power nonvolatile memory, which remains a daunting challenge. Especially, tunable photoconductivity for biocompatible materials is highly desired for interfacing with biological systems but is less explored in organic materials. Here, we report nanofibers self-assembled with cyclo-tyrosine-tyrosine (cyclo-YY) having voltage-regulated inverse photoconductance and photoconductance. The peptide nanofibers can be switched back and forth by a bias voltage for imitating biological sensing in artificial vision and memory devices. A peptide optoelectronic resistive random access memory (PORRAM) device has also been fabricated using the nanofibers that can be electrically switched between long-term and short-term memory. The underlying mechanism of the reversible photoconductance is discussed in this paper. Due to the inherent biocompatibility of peptide materials, the reversible photoconductive nanofibers may have broad applications in sensing and storage for biotic and abiotic interfaces.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）