CHEMICAL PHYSICS
·
2024
·
IF 2
Xuecheng Ren,Mingxing Xiao,Kaidong Zhan,Fan Wu,Quinn Qiao
Inorganic lead-free perovskite Cs 3 B i2 I 9 has attracted extensive attention due to its enhanced stability and environmental friendliness. However, the photon-to-current conversion of Cs 3 B i2 I 9 perovskites is not efficient, partly due to inefficient electron-hole separation. In this manuscript, BiFeO 3 was deposited at the interface of Cs 3 Bi 2 I 9 /TiO 2 as the interface modifier by sol–gel method, and the photocurrent and responsiveness of the Cs 3 B i2 I 9 /BiFeO 3 /TiO 2 were significantly higher than those of the Cs 3 B i2 I 9 /TiO 2 based device. Kelvin probe force microscope, photoelectrochemical impedance spectroscopy and in-situ surface photovoltage spectra demonstrated that a self-polarized electric field of BiFeO 3 contributed to the separation of photogenerated charge carriers at the Cs 3 B i2 I 9 /TiO 2 interface. By analyzing the surface photovoltage phase spectra via a vector model method, complicated surface photovoltage processes were identified, and a detailed relationship between photocurrent generation and transfer characteristic of the photogenerated charge carriers have been discussed.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 7
·1413
·
IF 4.6
Tao Tang,Haoran Zhang,Hexu Wang,Xiaoyu Dou,Jianfeng Wen,Li Jiang
The development of green, efficient, and reusable photocatalysts is important for pollution degradation. In recent years, Cs3Bi2I9has been shown to be an effective photocatalyst. However, the rapid recombination of electrons and holes weakens the photocatalytic activity. In this work, the photogenerated electron transfer rate was promoted by ZIF-8 compositing with Cs3Bi2I9, which effectively improved the pollutant degradation. After 50 min of visible light irradiation, Cs3Bi2I9/ZIF-8 removed up to 98.2% of methylene blue (MB), which was 4.15 times higher than that of Cs3Bi2I9alone. In addition, the Cs3Bi2I9/ZIF-8 composite still exhibited high photocatalytic activity after three cycling experiments. Our research offers a simple and efficient method for enhancing the photocatalytic activity of lead-free halide perovskites.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2024
·Vol. 57
·期 33
·335101
·
IF 3.1
Jingyi Liu,Wanggao Nie,Lairong Yan,Hao Hu,Guoqiang Zhang,Ping Lin,Haihua Hu,Lingbo Xu,Peng Wang,Can Cui
Lead-free halide perovskites have attracted widespread research interest due to their excellent optoelectronic properties and environmental friendliness. As one of the bismuth iodide compounds, Cs3Bi2I9 perovskite has been extensively explored in the field of photovoltaic devices and radiation detectors due to their non-toxic lead-free components and excellent stability. In this work, we successfully grow large-sized Cs3Bi2I9 single crystals (SC) with (l00) and (00l) crystal exposure facets by inverse temperature crystallization method. Under 525 nm light illumination with the intensity 15 mW cm−2 and 7 V bias, the (l00) Cs3Bi2I9 SC shows 2 times higher photocurrent, 3.6 times higher responsivity, and 2.8 times higher detectivity than the (00l) Cs3Bi2I9 SC, respectively. Superior response time in the scale of millisecond is obtained in both (l00) and (00l) Cs3Bi2I9 SCs. Based on the first-principle calculation, the (l00) SC possesses a higher charge distribution density and a wider dispersion distribution than (00l) SC, suggesting that more electrons in the (l00) SC can be excited in a wider range. The tighter arrangement of Cs+ and [BiI6]− octahedra in the (l00) SC than (00l) SC leads to the anisotropic photoelectric performance in (l00) and (00l) Cs3Bi2I9 SCs. Our results provide a strategy for the oriental growth of Cs3Bi2I9 SCs and the design of anisotropic optoelectronic devices with excellent performance.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2023
·
IF 2.8
Anfeng Li,Manman Yang,Aoxi He,Peng Tang,Xia Hao,Lili Wu,Wenbo Tian,Dingyu Yang,Jingquan Zhang
Cs 3 Bi 2 I 9 (CBI) is a promising material for direct X-ray detectors. However, for the solution method, due to the difference in the chemical potential of Cs + , Bi 3+ , I − ions in the solvent, the composition of CBI single crystals (SCs) prepared by the solution method often deviates from the stoichiometric ratio, resulting in the formation of many defects in the material, which degrades the quality of the SC. Herein, Br − and Cl − are used as dopants to produce CBI SCs by the top seed solution method. It can be speculated that the dopant ions can reduce the V I defects in the CBI by means of density functional theory calculations. The carrier lifetimes of CBI SCs doped with Br − and Cl − have been increased to 41.7 and 13.0 ns, respectively. Meanwhile, the defect densities of the SCs are reduced to 1.02 × 10 9 and 1.85 × 10 9 cm −3 , respectively. X-ray detectors based on Br-doped CBI and Cl-doped CBI SCs exhibit high X-ray sensitivity of 23071.3 and 18525.3 μC Gy air −1 cm −2 at an electric field of 40 V mm −1 , respectively. In addition, the X-ray detection limit reaches 1.07 and 1.35 nGy air s −1 at an electric field of 2.5 V mm −1 , respectively.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 46
·23388-23395
·
IF 9.931
Qihao Sun,Yadong Xu,Hongjian Zhang,Bao Xiao,Xin Liu,Jiangpeng Dong,Yuanbo Cheng,Binbin Zhang,Wanqi Jie,Mercouri G. Kanatzidis
The halide perovskitoid compound Cs3Bi2I9 (CBI) has attracted considerable interest as a semiconductor because of its outstanding stability and reduced toxicity compared with lead-based halide perovskites. Here, we report the growth of nuclear radiation detection grade CBI bulk crystals (Φ 15 × 60 mm3) with a high resistivity of over 1010 Ω cm using a modified vertical Bridgman method. Because of their layered crystal structures we investigated the anisotropy in the optical and electrical properties using different crystal orientations. The CBI(001) sample exhibits a resistivity of ∼1012 Ω cm compared to ∼1010 Ω cm for the CBI(100) sample. This is due to the anisotropic mobility in the two crystallographic directions. Using 425 nm LED (∼200 mW cm−2) illumination CBI(001) possesses a superior optical response with a switching ratio of over 40, which is critically higher than that of CBI(100) (<2). Detectors of 2 mm thickness show a capability of detecting 241Am@5.49 MeV α particles, with good peak discrimination. A full width at half maximum (FWHM) of 32% was obtained under a bias of 560 V. Simultaneously, the electron mobility and mobility lifetime (μτ) were calculated to be 6.10 cm2 V−1 s−1 and 2.03 × 10−5 cm V−1, respectively. First-principles density functional theory calculations confirm the crystallographic anisotropy of the carrier effective masses. In addition, a significant X-ray sensitivity of 111.9 μC Gy−1 cm−2 for a CBI detector was observed, under 80 kVp X-rays at an electrical field of 450 V cm−1.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 45
·25802-25807
·
IF 2.936
Jinyu Gu,Gangbin Yan,Yuebin Lian,Qiaoqiao Mu,Huidong Jin,Zaichao Zhang,Zhao Deng,Yang Peng
Inorganic defect halide compounds such as Cs3Bi2I9 have been regarded as promising alternatives to overcome the instability and toxicity issues of conventional perovskite solar cells. However, their wide indirect bandgaps and deep defect states severely limit their photoelectronic conversion efficiency when implemented in devices. Trivalent cation substitution has been proposed by previous calculations allowing the engineering of their band structures, but experimental evidences are still lacking. Herein we use the trivalent cation Ru3+ to partially replace Bi3+ in Cs3Bi2I9, and reveal their structural and optoelectronic properties, as well as the environmental stability. The Ru-doped Cs3Bi2I9 shows a decreasing bandgap with the increasing doping levels and an overall up-shift of band structure, owing to the dopant-induced defect states and thus enhanced phonon–electron coupling. As a result, upon Ru3+ doping, the narrowed bandgap and the upward shift of the band structures might facilitate and broaden their applications in optoelectronic devices.
研究领域:
材料科学
·
能源科学
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Lu Chen,Jinxin Bian,Tiansheng Zhang,Xiaoyi Li,Ronghua Jian,Fan Wu
In this study, we employed lock-in amplifier-based surface photovoltage (SPV) spectroscopy to identify bandgap excitations, bound exciton states, and defect excitations in Cs 3 Bi 2 I 9 . This method, combined with SPV phase spectroscopy, enabled the evaluation of deep-level and shallow-level defects, correlating with charge-transfer transitions and defect-induced broad tailing absorption observed in the absorption spectrum. We found that deep-level defects in Cs 3 Bi 2 I 9 films can produce both positive and negative SPV signals, allowing for the simulation of excitatory and inhibitory synapses in neural networks and potential applications in robotic eye implants. By integrating Cs 3 Bi 2 I 9 thin films rich in deep-level defects, robotic eyes can generate execution and cancellation commands based on SPV responses to different light wavelengths. Our results demonstrate that defect states in Cs 3 Bi 2 I 9 are preparation-dependent, leading to broad tailing absorption and enabling the conversion of SPV signals via wavelength modulation. These results highlight the potential of Cs 3 Bi 2 I 9 in advanced optoelectronic applications.
研究领域:
材料科学
·
光学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2025
·Vol. 36
·期 13
·135702
·
IF 2.8
Yaoyao Song,Huiyin Zhang,Mengfan Liu,Yubo Wan,Hao Sun,Yang Cao
Lead-free cesium bismuth iodide (Cs3Bi2I9) perovskite exhibits extraordinary optoelectronic properties and attractive potential in various optoelectronic devices, especially the application for photodetectors (PDs). However, most Cs3Bi2I9 PDs demonstrated poor detection performance due to the difficulty in obtaining high-quality polycrystalline films. Therefore, it makes sense to modulate the preparation of high-quality Cs3Bi2I9 polycrystalline films and expand its applications. Here, a solvent-modulated method combining anti-solvent and precursor engineering has been developed to regulate the crystallization dynamics of Cs3Bi2I9. Anti-solvent treatment is to suppress the asynchronous separation out of CsI and BiI3 due to significant differences in solubility, promoting uniform nucleation and limiting flake-like growth. Precursor engineering is synchronously used to modulate the subsequent nucleation growth dynamics. Due to the synergistic modulation, smooth and compact Cs3Bi2I9 polycrystalline films with distinct grains and grain boundaries can be easily obtained. The as-prepared PD exhibits an excellent on/off ratio of 4.26 × 105 as well as the detectivity up to 6.49 × 1010 Jones at zero bias. And, the Cs3Bi2I9 PD indicates excellent device stability, maintaining about 70% of the original performance after being stored for 400 h in the air without encapsulation.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 21
·5096
·
IF 4.2
Tao Tang,Xiaoyu Dou,Haoran Zhang,Hexu Wang,Ming Li,Guanghui Hu,Jianfeng Wen,Li Jiang
In recent years, halide perovskite materials have become widely used in solar cells, photovoltaics, and LEDs, as well as photocatalysis. Lead-free perovskite Cs 3 Bi 2 I 9 has been demonstrated as an effective photocatalyst; however, the fast recombination of the photogenerated carriers hinders further improvements of its photocatalytic activity. In this work, Ti 3 C 2 was composited with Cs 3 Bi 2 I 9 to promote the transfer and separation of photogenerated carriers, and thus the pollutant degradation efficiency was effectively improved. The visible-light photocatalytic reduction of Cs 3 Bi 2 I 9 /Ti 3 C 2 on rhodamine B (RhB), methylene blue (MB), and malachite green (MG) was as high as 97.3%, 96%, and 98.8%, respectively, improvements of almost 31.2%, 37.8%, and 37.2% compared to that of sole Cs 3 Bi 2 I 9 . Our study provides a simple way to enhance the photocatalytic activity of lead-free halide perovskites.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 23
·2201585
·
IF 10.05
Shunyong Wei,Shujie Tie,Kai Shen,Hui Sun,Xiaojia Zheng,Hao Wang,Wenqing Liang,Jihua Zou,Yixuan Huang,Lingzhi Luo,Xiangyu Zhou,Tixian Zeng,Aobo Ren,Dewei Zhao,Jiang Wu
Intrinsically high attenuation of X-rays and excellent optoelectronic properties endow Cs 3 Bi 2 I 9 with great promise for high-performance X-ray detectors. However, preparation of high quality Cs 3 Bi 2 I 9 single crystal with large area and millimeter-thick remains challenging and time-consuming. A size scalable growth technology, a mechanical sintering process, which is applicable for the integration in image detectors is proposed in this work. Compared with the Cs 3 Bi 2 I 9 wafer, the Cs 3 Bi 2 I 9 /MXene composite wafer exhibits higher carrier transfer efficiency and mobility-lifetime product through incorporation of Ti 3 C 2 T x MXene multilayer nanoflakes (MXene nanoflakes). The Cs 3 Bi 2 I 9 /MXene composite wafer X-ray detector shows an excellent linearity of X-ray response, a fast response speed, and a low limit of detection of 231 nGy air s −1 . The sensitivity of 368 µC Gy air −1 cm −2 under 120 V mm −1 is achieved, which is 15.4% enhanced over the Cs 3 Bi 2 I 9 wafer detector. The sensitivity of Cs 3 Bi 2 I 9 /MXene wafer device enhances ≈20–40% at low applied voltage regime. In addition, the Cs 3 Bi 2 I 9 /MXene wafer detector exhibits excellent operational stability after storage for 12 months in ambient air. This work provides an alternative approach for realization of next-generation high-performance perovskite X-ray detectors.
研究领域:
材料科学
·
电子工程
·
医学影像
✓ 已验证
产品关联
DOI
高影响因子
IEEE ELECTRON DEVICE LETTERS
·
2024
·Vol. 45
·期 6
·1036-1039
·
IF 4.1
Jiayang Liu,Yuangan Chen,Pengju Tan,Tianyu Liu,Mingzhu Hu,Mulin Sun,Long Cheng,Xiaolan Ma,Yunlong Zhang,Qin Hu
Cs3Bi2I9 single crystals has attracted increasing attention in perovskite X-ray detectors due to its low cost, nontoxicity, high stability and low detection limit. With the gradual improvement of device performance, the growth of high-quality, low-defect single crystals becomes increasingly crucial. In this work, we developed a polypropylene glycol nucleation control strategy for the effective growth of Cs3Bi2I9 single crystals with fewer defects. The X-ray detectors prepared by this strategy exhibit excellent detection and imaging performance, reaching a sensitivity of
$173.9~\mu $
C
$\cdot $
Gy
$_{\text {air}}^{-{1}}\cdot $
cm
$^{-{2}}$
at 40 V
$\cdot $
mm
$^{-{1}}$
and a detection limit of
$1.57~\mu $
Gy
$_{\text {air}}\cdot $
s
$^{-{1}}$
, and showcasing sharp imaging ability. This research contributes to the advancement of next-generation X-ray detection.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
DOI
高影响因子
ACS Photonics
·
2022
·
IF 7.077
Jianyu Zhang,Anfeng Li,Bohan Li,Manman Yang,Xia Hao,Lili Wu,Dewei Zhao,Gengpei Xia,Zefeng Ren,Wenbo Tian,Dingyu Yang,Jingquan Zhang
X-ray detection is widely used in medical imaging, safety inspection, scientific research, and so on, in which the Cs3Bi2I9 perovskite single crystal (SC) material has attracted increasing attentions for its excellent intrinsic properties (high X-ray absorption coefficient, low toxicity, high resistivity, etc.). However, existing methods for this SC growth enable low quality and high preparation cost, thus resulted in the defects of limit sensitivity, detectable dose rate, and large-scale application of the Cs3Bi2I9-based device. In this work, high-quality Cs3Bi2I9 perovskite SCs were successfully grown by the novel top-seed solution (TSS) method, which contains the advantages of constant growth rate, simple system and high yield. Due to the high quality of TSS-based Cs3Bi2I9 SC, the X-ray detector exhibited high sensitivity of 4382 μC·Gyair–1 cm–2 at 20 V mm–1 bias. Under 7.93 nGyair s–1 X-ray irradiation, the signal-to-noise ratio reached 27.9. This work presents a new strategy for the low-cost growth of high-quality Cs3Bi2I9 perovskite SC.
研究领域:
材料科学
·
医学影像
·
辐射探测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）