APL Materials
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2022
·Vol. 10
·期 4
·
IF 6.635
Wang Mengrou,Xu Yubing,Wang Xin,Li Yuwei,Zhao Jingda,Pan Yuzhu,Chen Jing,Li Qing,Zhao Zhiwei,Wu Jun,Lei Wei
All-inorganic halide semiconductors with perovskite or perovskite-like structure have aroused a widespread concern recently for its environmental friendliness and stabilities while possessing excellent optoelectronic properties. Double perovskite Cs 2 AgBiBr 6 single crystal (SC) is one of the most representative materials in the latest research area. To further improve the device response range and decrease its dark current density effectively, functional layers based on the solution-processed epitaxial method are normally fabricated as heterojunctions. Herein, a novel idea of a broadband heterojunction MAPbI 3 (MA = CH 3 NH 3 )/Cs 2 AgBiBr 6 is proposed in this work to achieve this goal. A MAPbI 3 layer is fabricated on Cs 2 AgBiBr 6 SC substrates through immersing Cs 2 AgBiBr 6 SC into MAPbI 3 solution at a MAPbI 3 crystallization temperature. Ultimately, this heterojunction device expands the absorption limit from 618 to 838 nm, makes responsivity range redshift from 629 to 860 nm, and achieves a responsivity of 16.8 mA W −1 while the detectivity of 1.33 × 10 11 Jones under 622 nm 0.55 mW cm −2 illumination at −20 V bias, maintaining excellent optoelectronic properties.
研究领域:
材料科学
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光电材料
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半导体物理
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2024
·
IF 3.9
Minjie Wu,Teng Chen,Xuedan Chen,Maoxue Wang,Chen Lv,Kai Meng,shuanglong Yuan
Perovskite-based photodetectors (PDs) are broadly utilized in optical communication, non-destructive testing, and smart wearable devices due to their ability to convert light into electrical signals. However, toxicity and instability hold back their mass production and commercialization. The lead-free Cs2AgBiBr6 double perovskite film, promised to be an alternative, is fabricated by electrophoretic deposition (EPD), which compromises film quality. Herein, we improved the quality of the Cs2AgBiBr6 films and the performance of PDs by adding N-acetylethylenediamine (DEAC) to Cs2AgBiBr6 perovskite precursor for EPD, in which the ligand DEAC provides a pair of lone electrons to Bi3+, forming coordinate covalent bonds. The optimized PDs have high detectivity, up to 4.4×1012 Jones, and high stability in the air. The high-performance, flexible Cs2AgBiBr6 perovskite PDs were fabricated on this basis, it also achieved the detectivity up to 3.2×1012 Jones with excellent bending cycle stability. These results propose a feasible approach to improving the crystallization of double perovskite thin films by introducing ligands during the EPD process. Furthermore, they demonstrate enhanced optoelectronic performance, indicating that this method is also applicable to halide perovskites, offering an effective strategy to improve their film quality.
研究领域:
材料科学
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光电子学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Yu Zou,Wenjin Yu,Xiangdong Li,Hantao Wang,Bo Qu,Zhijian Chen,Lixin Xiao
Lead-free double perovskite Cs2AgBiBr6 is considered to serve as a substitute for toxic lead-based perovskite components and is a promising candidate for environmentally friendly perovskite solar cells (PSCs). However, the high deep-level trap density in Cs2AgBiBr6 films hinders the device performance, which is caused by the different solubilities of components in the precursor solution and the solution-process fabrication method. In this work, we reported a surface reconstruction (SR) strategy, in which a dissolution process is initiated by dimethyl sulfoxide (DMSO) and followed by the introduction of methylammonium bromide (MABr) to generate a mixed organic–inorganic intermediate phase and induce an orderly recrystallization. The dissolution–recrystallization process effectively improves the overall crystalline quality and surface composition stoichiometry ratio, passivates the bromine vacancies enriched in the film, and forms a dense as well as ordered film surface, resulting in reduced trap density, extended carrier lifetime, better interfacial contact, and faster carrier extraction. The differences in underlying mechanisms and effects between the conventional interfacial passivation (IP) strategy based on the passivator/isopropanol (IPA) system and the SR strategy proposed in this work were also compared by multiple characterizations. All these advantages enable the Cs2AgBiBr6-based PSCs fabricated by the SR strategy to achieve a significantly higher power conversion efficiency (PCE) of 2.05% and an ultrahigh fill factor (FF) of 83.80% as well as open-circuit voltage (VOC) of 1.201 V, with good stability and broad applicability in the hole transport layer (HTL)-free PSCs. Therefore, this work points out the fundamentally different mechanisms of two post-treatment strategies on the overall regulation of Cs2AgBiBr6 films and provides a clear clue to further enhance the quality of lead-free double perovskite films and optimize the photovoltaic performance of PSCs.
研究领域:
材料科学
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光伏技术
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能源转换
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Min Qiu,Xue-Li Yang,Zi-Xuan Zhao,Qiu-Ping Luo,Ling Chen,Jun Du,Xing Fan,Bing-Xin Lei
The separation and transfer of photogenerated charges are limited by the deep energy defects and high exciton binding energy of Cs 2 AgBiBr 6 (CABB). The creation of heterostructure is a great promising path to solve this obstacle. In this paper, BiOBr (BOB) nanosheets epitaxially grew on the surface of CABB octahedrons through immersing CABB into in water-solution with the assistance of ethanol, thereby creating an interesting CABB/BOB heterojunction. The CABB/BOB heterostructure markedly enhances water stability, preserving its structure and morphology even after being submerged in a mixture of ethanol and water for 100 h. The CABB/BOB photocatalyst exhibited significantly enhanced photocatalytic activity towards the degradation of Rhodamine B in comparison to its individual pristine components, namely CABB and BOB. Specifically, the advanced CABB/BOB−90 photocatalyst attains a degradation efficiency of 98 % within 40 min, significantly surpassing the initial CABB and BOB photocatalysts by approximately 1.3 and 4.1 times, respectively. The heightened photocatalytic activity is attributable to the formation of a tightly integrated heterojunction interface, which promotes the efficient separation of charge carriers.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 16
·7076-7091
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IF 4.5
Jiang Bangqi,Yan Genghua,Xiao Yao,Yuan Ye,Zhao Chuanxi,Mai Wenjie,Hong Ruijiang
All-inorganic Cs 2 AgBiBr 6 film is one of most promising materials in the perovskite family for long-term daily life photodetection applications, due to its fairly nice stability and lead-free nontoxic property. However, high annealing temperature (> 250 °C) process is widely used and low temperature synthesis of high-quality Cs 2 AgBiBr 6 is still a big challenge, which limits the development toward flexible device. Herein, we developed a Mn doping solution route for Cs 2 AgBiBr 6 perovskite which is the first reported element doping process that can effectively improve the film quality under low annealing temperature. The corresponding flexible photodetectors exhibit favorable self-power characteristics and satisfying photoelectric performance with high detectivity of > 10 10 Jones, μs level response speed and large LDR over 110 dB. Such good performance can be maintained even at 120 °C fabrication process. The material properties, device performances and doping mechanism are systematically discussed in the paper. To our knowledge, this is one of the lowest temperature fabrication processes for high performance flexible Cs 2 AgBiBr 6 devices. Our results suggest a feasible method and indicate the promising application of Cs 2 AgBiBr 6 films for flexible photovoltaic devices.
研究领域:
材料科学
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光电技术
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DOI
高影响因子
JOURNAL OF CATALYSIS
·
2021
·
IF 7.92
Daofu Wu,Yan Tao,Yanyi Huang,Benjun Huo,Xusheng Zhao,Jiayu Yang,Xiaofang Jiang,Qiang Huang,Fan Dong,Xiaosheng Tang
Lead halide perovskite nanocrystals (NCs) have been recognized as a rather competitive candidates for potential advanced optoelectronic applications. But the toxicity of lead and the intrinsic instability are the key concerns for their large-scale commercialization. For addressing these tricky issues, we synthesized lead-free all-inorganic Cs 2 AgBiBr 6 double perovskite NCs adopting a facile hot injection approach. The as-prepared NCs could keep their structure stable either in air for more than two months or being heated at 300 °C in ambient atmosphere for 3 h. Moreover, Cs 2 AgBiBr 6 NCs were investigated for photocatalytic NO removal under visible-light irradiation, achieving an exciting removal rate of 97%, which is much higher than the previous reports as we know. In addition, the Cs 2 AgBiBr 6 NCs demonstrated outstanding recyclability for at least four cycles in NO removal. The photocatalytic mechanism of Cs 2 AgBiBr 6 NCs was further proposed. This investigation offers a new environmental photocatalyst to purify the air.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 32
·期 12
·2109891
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IF 18.808
Ganghong Liu,Zehao Zhang,Cuncun Wu,Yuqing Zhang,Xiangdong Li,Wenjin Yu,Guangjie Yao,Shiming Liu,Jun-jie Shi,Kaihui Liu,Zhijian Chen,Lixin Xiao,Bo Qu
The toxicity of lead-based halide perovskites hampers broad application in optoelectronics. Lead-free perovskite Cs 2 AgBiBr 6 is considered a promising candidate, owing to the long carrier lifetime and great stability. However, the relatively large bandgap of 1.98 eV limits its absorption in the visible region. Herein, Fe 2+ is chosen as the dopant to alloy into Cs 2 AgBiBr 6 single crystals, and results in an absorption range broadening to ≈1350 nm, which is the longest near-infrared (NIR) response recorded among lead-free perovskites. About 1% of Fe ions are alloyed into the Cs 2 AgBiBr 6 lattice to cause lattice shrink age. Instead of narrowing the bandgap, Fe doping would introduce a new intermediate band inside the pristine bandgap of Cs 2 AgBiBr 6 to strongly absorb NIR light, as confirmed by third harmonic generation results. Moreover, considerable photogenerated carriers are produced in Fe doped Cs 2 AgBiBr 6 crystals with NIR irradiation. This work has provided a new way to extend the optical response of lead-free perovskites for NIR photodetectors and intermediate band photovoltaics.
研究领域:
材料科学
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光电子学
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产品关联
DOI
高影响因子
Nature Photonics
·
2017
·Vol. 11
·期 11
·726-732
·
IF 37.852
Pan Weicheng,Wu Haodi,Luo Jiajun,Deng Zhenzhou,Ge Cong,Chen Chao,Jiang Xiaowei,Yin Wan-Jian,Niu Guangda,Zhu Lujun,Yin Lixiao,Zhou Ying,Xie Qingguo,Ke Xiaoxing,Sui Manling,Tang Jiang
Sensitive X-ray detection is crucial for medical diagnosis, industrial inspection and scientific research. The recently described hybrid lead halide perovskites have demonstrated low-cost fabrication and outstanding performance for direct X-ray detection, but they all contain toxic Pb in a soluble form. Here, we report sensitive X-ray detectors using solution-processed double perovskite Cs 2 AgBiBr 6 single crystals. Through thermal annealing and surface treatment, we largely eliminate Ag + /Bi 3+ disordering and improve the crystal resistivity, resulting in a detector with a minimum detectable dose rate as low as 59.7 nGy air s −1 , comparable to the latest record of 0.036 μGy air s −1 using CH 3 NH 3 PbBr 3 single crystals. Suppressed ion migration in Cs 2 AgBiBr 6 permits relatively large external bias, guaranteeing efficient charge collection without a substantial increase in noise current and thus enabling the low detection limit.
研究领域:
材料科学
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医学影像
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辐射探测
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 16
·7395-7402
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IF 3.925
Qiao Huang,Yanmei Guo,Jinxi Chen,Yongbing Lou,Yixin Zhao
Lead halide perovskites have exhibited promising achievements in the field of photoelectricity and photocatalysis. However, the toxicity of Pb hampers their practical application. Herein, an environment-friendly and Pb-free double perovskite, NiCoP/Cs2AgBiBr6 (NCP/CABB) composite, was successfully synthesised for the first time via efficient electrostatic coupling. It was applied for H2 generation in an HBr solution. The NCP/CABB composite maintained a steric regular perovskite structure. The optimal 12.5% NCP/CABB composite achieved the highest H2 generation rate (373.16 μmol g−1 h−1), which was approximately 88 times higher than that of pure CABB and was even better than that of CABB/5% Pt. Additionally, the NCP/CABB composite displayed excellent photocatalytic cycling stability in 4 h cycle tests. Due to the loading of NCP nanoparticles with preeminent conductivity, the separation and transfer of photoelectrons were promoted effectively, thereby enhancing photocatalytic performance. This work highlights a feasible strategy with broad prospects for the development of Pb-free perovskite composite catalysts.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2023
·Vol. 56
·期 7
·075501
·
IF 3.4
Lun Zhang,Yinyan Xu,Pujun Niu,Mei Lyu,Hongbo Lu,Jun Zhu
Cs2AgBiBr6 solar cells have the advantages of non-toxicity and high stability and are regarded as one of the most promising novel solar cells. The crystallization kinetics of the films play a crucial role on the film microstructure and the optoelectronic properties. Herein, thiourea is introduced into the Cs2AgBiBr6 precursor solution as an additive. Fourier transform infrared spectroscopy characterization confirms that thiourea acts as a Lewis base to form an adduct with Ag+, Bi3+. The modified Cs2AgBiBr6 film is used to fabricate solar cells. As a result, the power conversion efficiency and the open-circuit voltage of the optimized device are 1.65% and 1.07 V, significantly higher than the control device (1.04% and 0.89 V). Dark current–voltage, electrochemical impedance spectroscopy, etc, reveal that defects and recombination in the solar cells are inhibited. This work provides an effective method to regulate the crystallization kinetics of Cs2AgBiBr6 film and is helpful for further enhancement of the photovoltaic performance of Cs2AgBiBr6 solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yunhao Fan,Feiyang Qiao,Daxue Du,Jiahao Bao,JingJing Liang,Hong Liu,Wenzhong Shen
The stability and toxicity problems have haunted the development and applications of metal halide perovskite materials, for which the lead-free inorganic double perovskite Cs2AgBiBr6 has emerged as a promising substitute in recent years. However, poor film quality has severely limited its photovoltaic performance that could have been induced by some key factors such as high annealing temperature. Herein, we present a facile strategy to fabricate high-quality pinhole-free Cs2AgBiBr6 films with large grain sizes by introducing carbohydrazide (CBH) into the precursor. Detailed characterizations have shown that the carbonyl group (C═O) in CBH plays the critical role in coordinating with Ag+ and Bi3+ cations during the film formation process. As another consequence, the as-fabricated devices have exhibited significantly higher reproducibility for fabrication. By optimizing the amount of CBH, the power conversion efficiency (PCE) relatively increased 37 to 1.57%, which remained 95.0% in an ambient environment for a 1000-h test. Hopefully, this work could facilitate the current technologies in the exploration of high-performance lead-free perovskites such as Cs2AgBiBr6 and better understanding of the mechanism in the additive engineering as well.
研究领域:
材料科学
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光伏技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 23
·18758-18767
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IF 2.779
Yang Akang,Zhang Lun,Xu Yinyan,Wang Qian,Lyu Mei,Lu Hongbo,Zhu Jun
Cs 2 AgBiBr 6 is a lead-free perovskite that shows great potential to solve the toxicity and instability of organic–inorganic lead perovskite. However, because of the poor interface contact and inferior film quality, the open-circuit voltage and the power conversion efficiency of the solar cells are inhibited. Herein, the Cs 2 AgBiBr 6 film quality is improved by adding formamidinium acetate into the precursor solution. With additive regulation, the grain size increases and the film surface is more smooth. The crystal structure remains unchanged, and the defect density decreases. Correspondingly, the average power conversion efficiency of the target device increases more than 30% than the control device. The best efficiency approaches 2.09%, and the open-circuit voltage is surprisingly high at 1.23 V, the highest value reported for Cs 2 AgBiBr 6 solar cells. Moreover, the device remains more than 90% of its initial efficiency after 40 days of storage under environmental conditions, showing excellent stability. This work is therefore helpful for enhancing the efficiency and stability of inorganic lead-free perovskite solar cells toward future commercialization.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
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