CRYSTAL GROWTH & DESIGN
·
2020
·
IF 4.089
Fangbao Wang,Hongjian Zhang,Qihao Sun,Ahmed Ben Hafsia,Zhangxuan Chen,Binbin Zhang,Yadong Xu,Wanqi Jie
The all-inorganic halide perovskite CsPbBr3 exhibited extraordinary photoelectric properties as well as great potential for various optic-electronic devices. The introduction of a Cl/I dopant is an effective method to optimize their properties. However, it is still a challenge to grow doped CsPbBr3 single crystals from solution. In this work, we report on the crystal growth of Cl/I-doped CsPbBr3 crystals using the modified inverse temperature crystallization (ITC) method. The components of raw materials and solvent in precursors were precisely tailored. The resulting doping ratio between the actual content and the nominal content are 0.99 and 0.046 for Cl and I, respectively. It indicates that I ion doped crystals exhibit more severe stoichiometric deviation due to the lower decomposition energy. The crystal structure, morphology, and optical properties of doped crystals were also investigated systematically. The {101} and {010} facets of as-grown crystals were influenced by the doping process. PL and UV transmittance spectra exhibited changes in the band gap in Cl/I-doped crystals. Finally, the phase diagram of basic photoelectric properties was determined for CsPb(Br1–nCln)3 crystals and it reveals conductive type changes from the P type to N type with an increase in the doping content of the Cl element. The optimum component of CsPb(Br0.93Cl0.07)3 demonstrates the highest resistivity of 4.3 × 109 Ω cm, an on/off ratio of ∼40, and a mobility of 414 cm2 V–1 s–1 as well as the lowest carrier concentration of 3.57 × 107 cm–3. Our work provides a strategy to grow doped halide perovskite crystals and tailor their optical and electrical properties.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Zhang Xin,Bai Ruichen,Fu Yuhao,Hao Yingying,Peng Xinkai,Wang Jia,Ge Bangzhi,Liu Jianxi,Hu Yongcai,Ouyang Xiaoping,Jie Wanqi,Xu Yadong
α particles must be monitored to be managed as radioactive diagnostic agents or nuclear activity indicators. The new generation of perovskite detectors suffer from limited energy resolution, which affects spectroscopy and imaging applications. Here, we report that the solution-grown CsPbBr 3 crystal exhibits a low and stable dark current (34.6 nA·cm −2 at 200 V) by thinning the as-grown crystal to decrease the high concentration CsPb 2 Br 5 phase near the surface. The introduction of the Schottky electrode for the CsPbBr 3 detector further reduces the dark current and improves the high-temperature stability. An energy resolution of 6.9% is achieved with the commercial electronic system, while the effects of air scattering and absorption are investigated. Moreover, 1.1% energy resolution is recognized by a full-customized readout application-specific integrated circuit without any additional signal processing, which matches well with the given parameters of the CsPbBr 3 detector by reducing the parasitic capacitance and electronic noise.
研究领域:
材料科学
·
核技术应用
·
电子学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yifan Zhou,Zhiliang Deng,Bing Wang,Pei Li,Lingxi Li,Wenmin Han,Jie Huang,Wenbao Jia,Xiaoping Ouyang,Qiang Xu,Kostya (Ken) Ostrikov
Nanocrystalline scintillators with low-cost, fast response, and high light yield are widely used for X-ray imaging. However, they fail in high-energy X-ray imaging because of the fundamental limitations due to lateral radiation spreading in thicker device-compatible active layers. This issue is resolved by using the novel nanocomposite containing CsPbBr 3 scintillation single-microcrystalites embedded into transparent, natural wood-derived light-guiding fibrous structures. The CsPbBr 3 crystals convert X-ray to visible photons with a high photoluminescence quantum efficiency (76 %), and an average fast photoluminescence decay time of 25.9 ns. The delignified wood-derived fiber-like lumina effectively guide light, while suppressing the lateral spreading of scintillation photons. This unique porous nanocomposite material offers an excellent X-ray detection performance, and linear response in a wide parameter range. The developed scintillator screen achieves well-resolved, high-contrast X-ray imaging, featuring a very high spatial resolution of 11.9 lp/mm at a modulation transfer function of 0.2, thus exceeding the benchmark industry standards and offering a new advanced materials platform for radiation detection and dosimetry applications.
研究领域:
材料科学
·
医学影像
✓ 已验证
DOI
高影响因子
Energy & Environmental Science
·
2022
·Vol. 15
·期 11
·4813-4822
·
IF 39.714
Xingcheng Li,Xin Wu,Bo Li,Zeyan Cen,Yanbo Shang,Weitao Lian,Rui Cao,Lingbo Jia,Zhen Li,Danpeng Gao,Xiaofen Jiang,Tao Chen,Yalin Lu,Zonglong Zhu,Shangfeng Yang
Perovskite solar cells (PSCs) have drawn unprecedented attention due to their skyrocketing power conversion; however, their reported fill factors (FFs) still lag behind those of commercialized solar cells, and there is a lack of a comprehensive understanding of the mechanism. Here, we employed a facile and effective strategy to improve the FF to 96.3% of the Shockley–Queisser (S–Q) limit through homogeneous incorporation of CsPbBr3 crystals, which could significantly passivate deep-level hole defects, thereby leading to dramatically enhanced hole mobility to balance with electron mobility. As a result, the non-radiative recombination is suppressed along with enhanced carrier extraction efficiency, resulting in a remarkable PCE of 25.09% (certified: 24.66%) with a record FF of 86.9%, which is the highest FF among those of the reported PSCs. An in-depth analysis suggests that this strategy could concurrently reduce the FF loss caused by series resistance, shunt resistance, and non-radiative recombination. This work provides an efficient strategy to promote the FF to approach the theoretical limit.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 23
·13925-13932
·
IF 10.7
Ruichen Bai,Bangzhi Ge,Xin Liu,Xinkai Peng,Xin Zhang,Shilin Liu,Menghua Zhu,Chongjian Zhou,Alain Dubois,Wanqi Jie,Yadong Xu
The understanding and suppression of grown-in defects are expected to promote the semiconductor radiation detector performance. Here, we report the origin of liquid inclusion defects in CsPbBr3 crystals grown using the inverse temperature crystallization (ITC) method. The formation process of liquid inclusions is observed in situ and simultaneously the formation mechanism for liquid inclusions in CsPbBr3 bulk crystals is proposed. Based on the COMSOL Multiphysics simulation, a model is developed combining concentration and temperature gradients, associated with natural convection during crystallization, and is responsible for the liquid inclusions. By introducing forced convection to eliminate liquid inclusions, the crystalline quality of CsPbBr3 has been significantly improved, with the half-peak width of X-ray rocking curves optimized from 0.101° to 0.037°. A near one order of magnitude increase in bulk resistivity has been obtained while the hole mobility was improved to 142.95 cm−2 V−1 s−1, evaluated by the time-of-flight technique according to α particle induced pulses. Furthermore, the CsPbBr3 crystals free from liquid inclusions enable the fabrication of an asymmetric planar Au/CsPbBr3/Sn device with an energy resolution of 7.2% illuminated with 137Cs@662 keV γ-rays.
研究领域:
材料科学
·
半导体物理
·
辐射探测技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）