ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhipeng Lv,Huiping Gao,Yayong Hu,Yunpeng Fan,Gencai Pan,Huafang Zhang,Wenwu You,Zhenlong Zhang,Yanli Mao
Broadband photodetectors covering ultraviolet (UV) to near-infrared (NIR) wavelengths play an essential role in communications, imaging, and biosensing. Developing a single photodetector with a broadband optical response operating at room temperature can significantly reduce the complexity and cost of receiver systems for multispectral applications. In this work, utilizing the porous structure characteristics of Cs2AgBiBr6:Sn thin films, a self-powered detector with broad spectral response (UV–vis-NIR) was achieved by constructing an effective Cs2AgBiBr6:Sn/PDPP3T heterojunction. This photodetector possesses a broad response spectrum from 350 to 950 nm with an average detection rate exceeding 1011 Jones and maintains excellent photoelectric performance over two months. Sn2+ doping effectively reduces the bandgap of Cs2AgBiBr6, enhancing its near-infrared absorption and optimizing energy level alignment with conjugated polymer (diketopyrrolopyrrole-terthiophene, PDPP3T). More importantly, the porous structure derived from Sn doping significantly improves carrier extraction and transport under a near-infrared light response at the heterojunction interface. Utilizing its broad spectral response characteristics in the UV–vis-NIR range, a novel information transfer and encryption system employing full optical modulation has been realized within a single perovskite photodetector. This work provides a new approach to fabricating lead-free double perovskite broadband photodetectors with potential applications in photonic devices.
研究领域:
材料科学
·
光电技术
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Lun Zhang,Chengyang Wang,Ziying Wen,Yanrui Yang,Yuanyuan Zhou,Mei Lyu,Jun Zhu
Superoxide anion radicals (O 2 •- ) are easily produced during the operation of perovskite solar cells. Removing O 2 •- can effectively improve the stability and enhance the photovoltaic performance of perovskite solar cells. Here, we introduce a superoxide anion radical scavenger, 2,2,6,6-tetramethyl-4-[3-(trimethylammonio)propoxy]-1-piperidinyloxy chloride (TMAP-TEMPO) as an interface layer in Cs 2 AgBiBr 6 solar cells. TMAP-TEMPO can effectively eliminate O 2 •- and enhance the photostability of Cs 2 AgBiBr 6 films. Furthermore, the incorporation of TMAP-TEMPO not only reduces the defects in the Cs 2 AgBiBr 6 film but also promotes the hole transport. It also optimizes the energy level arrangement of the Cs 2 AgBiBr 6 solar cells. Finally, the power conversion efficiency (PCE) of the TMAP-TEMPO-modified Cs 2 AgBiBr 6 solar cells increased from 2.57% to 3.10%, achieving a higher open-circuit voltage ( V OC ) of 1.22 V, which represents one of the highest V OC reported for Cs 2 AgBiBr 6 solar cells. Additionally, the unencapsulated target solar cells retained 82% of their initial PCE after 40 days of storage at 20–30 °C and 55–65% relative humidity, or 85% after 300 h of storage at 60 °C in a nitrogen glovebox, respectively. This work offers a promising strategy for enhancing the photovoltaic performance of Cs 2 AgBiBr 6 solar cells.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18366-18374
·
IF 8.067
Qi Shao,Jun Yan,Weiqiang Gong,Yan Li,Feng Gao,Baoning Wang,Lin Li
Inorganic double perovskites have been widely used in photodetection and X-ray detection due to their nontoxic composition, large atomic number, and simple crystal growth from solution. However, double perovskites have a lower formation energy, which introduces additional antisite defects, resulting in a higher trap-state density. Here we report dopant-compensated double perovskite Cs2AgBiBr6−xClx single crystals (SCs) based on solution processing, which reduces the trap state density of the single crystals, enabling enhanced photodetection and ray detection capabilities of the device at room temperature. The dopant-compensated Cs2AgBiBr5.933Cl0.067 has a significantly improved mobility of 129 cm2 V−1 s−1. By using Cl ion doping, the Cs2AgBiBr5.933Cl0.067 SCs achieve excellent device performance in photodetection and X-ray detection, including a broad spectral response, a high responsivity of 60.8 mA W−1, a fast response time of 8 μs/566 μs, a superior X-ray detection sensitivity of 714 μC Gyair−1 cm−2, and a minimum dose rate as low as 36.48 nGyair s−1. Furthermore, the device exhibits high-fidelity photo-imaging at 5 V. All results demonstrate that an effective Cl ion doping strategy provides a great opportunity for developing functional detection devices.
研究领域:
材料科学
·
物理学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Junnan Wang,Zeyu Wang,Jindou Shi,Chen Zhang,Yun Zhou,Zheyuan Da,Arshad Saleem Bhatti,Minqiang Wang
In the realm of surface-enhanced Raman scattering (SERS) research, the precise detection and effective cleansing of substances are critical. This study introduces a novel Au nanotriangle/Cs2AgBiBr6 (Au NT/CABB) SERS array, synthesized through a meticulous two-step process, which demonstrates remarkable SERS effectiveness. Using Rhodamine 6G (R6G) as the probe molecule, this substrate accurately detects target molecules and achieves an exceptional detection threshold of 1 × 10–13 M. The integration of CABB into the substrate endows it with photocatalytic properties, thereby accelerating the degradation of adsorbed signaling molecules and significantly enhancing the reusability of the Au NT/CABB arrays. Furthermore, the arrays exhibit outstanding SERS and photocatalytic performance with methylene blue (MB) and MB&R6G mixed solutions, distinguishing between the two signal molecules with high fidelity. Additionally, the SERS enhancement mechanism of the Au NT/CABB array is analyzed by the finite-difference time-domain (FDTD) simulation and energy band structure. These findings highlight the substrate’s dual capability in leveraging both electromagnetic and chemical enhancement mechanisms for superior SERS performance, complemented by an integrated photocatalytic self-cleaning feature, making it a promising candidate for environmental detection applications.
研究领域:
材料科学
·
分析化学
·
环境科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 20
·10383-10389
·
IF 9.3
Haibo Zhu,Ting Zhong,Liu Yang,Yajing Shen,Qiangwen Fan,Zhanggao Le,Zongbo Xie
The photocatalytic activation of oxygen molecules (O2) is an environmentally friendly and sustainable alternative to substituted benzofuran-3(2H)-one synthesis. Herein, lead-free Cs2AgBiBr6 nanocrystals were used to activate O2 efficiently and selectively for the photocatalytic transformation of 4-hydroxycoumarins to functional 2-hydroxy-benzofuran-3(2H)-ones under an air atmosphere. Polyfunctionalized benzofuran-3(2H)-ones with a quaternary carbon center can be selectively obtained in moderate to good yields at room temperature via one-pot synthesis. Perovskite crystal structures have significant influence on photocatalytic activity due to the different charge separation abilities. The reaction mechanism was further investigated to confirm the contribution of reactive oxygen species (ROS).
研究领域:
材料化学
·
有机合成
·
光催化
·
绿色化学
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纳米材料
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环境科学
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可持续化学
✓ 已验证
DOI
高影响因子
Solar RRL
·
2018
·Vol. 2
·期 12
·1800217
·
IF 0
Ming Wang,Peng Zeng,Sai Bai,Jinwen Gu,Faming Li,Zhou Yang,Mingzhen Liu
Lead-free double perovskites have been demonstrated as promising alternatives to solve the toxicity and stability issues in conventional lead trihalide perovskites. However, different solubility of components in the precursors hinders fabrication of double perovskite films with commonly used solution procedures. Here, for the first time, the authors successfully prepared double perovskite Cs 2 AgBiBr 6 thin films throughout a sequential-vapor-deposition procedure. The obtained thin films with pure double perovskite phase show large grain sizes, uniform, and smooth surface properties. In addition, the high-quality vapor-deposited Cs 2 AgBiBr 6 films exhibit a photoluminescence (PL) lifetime of 117 ns, indicative of significant potential in photovoltaic applications. The resulting solar cells with planar device structure show an optimized power conversion efficiency of 1.37%, which can be maintained at 90% after 240 h of storage under ambient condition. Our results demonstrate the feasibility of employing vapor deposition technique to fabricate high-quality double perovskite thin films, which paves the way for further development of various optoelectronic devices based on these promising lead-free semiconductors.
研究领域:
材料科学
·
光伏技术
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半导体薄膜
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可再生能源
✓ 已验证
DOI
Advanced Science
·
2017
·Vol. 5
·期 3
·1700759
·
IF 9.034
Cuncun Wu,Qiaohui Zhang,Yang Liu,Wei Luo,Xuan Guo,Ziru Huang,Hungkit Ting,Weihai Sun,Xinrui Zhong,Shiyuan Wei,Shufeng Wang,Zhijian Chen,Lixin Xiao
Recently, lead-free double perovskites have emerged as a promising environmentally friendly photovoltaic material for their intrinsic thermodynamic stability, appropriate bandgaps, small carrier effective masses, and low exciton binding energies. However, currently no solar cell based on these double perovskites has been reported, due to the challenge in film processing. Herein, a first lead-free double perovskite planar heterojunction solar cell with a high quality Cs 2 AgBiBr 6 film, fabricated by low-pressure assisted solution processing under ambient conditions, is reported. The device presents a best power conversion efficiency of 1.44%. The preliminary efficiency and the high stability under ambient condition without encapsulation, together with the high film quality with simple processing, demonstrate promise for lead-free perovskite solar cells.
研究领域:
光伏技术
·
材料科学
·
可再生能源
·
半导体材料
✓ 已验证
DOI
高影响因子
ACS Applied Optical Materials
·
2026
·
IF 3.4
Yansu Shan,Lin Huang,Xingmu Li,Peng Zhang,Bingqiang Cao
Abstract Photon-counting detectors (PCDs) are highly anticipated for their exceptional ability to resolve weak optical signals that exist against a relatively low-background-noise environment, especially in medical computerized tomography. The performance of conventional silicon-based PCDs is often contingent upon cryogenic cooling, which restricts their practical applicability. Lead halide perovskites with wide bandgaps have garnered significant attention as a promising alternative, demonstrating remarkable performance in applications such as X-ray detection and photovoltaics. However, their potential for PCDs remains largely unexplored, and their commercial deployment is further hindered by inherent instability and lead toxicity. In this Letter, lead-free Cs2AgBiBr6 films were prepared by pulsed laser deposition (PLD) and their crystallinity and carrier transport properties were significantly enhanced through a postdeposition rapid thermal annealing process. The resulting photovoltaic device functioned as self-powered PCDs, achieving an ultralow dark count rate (DCR) of 56 cps·mm–2 at room temperature under zero bias, and maintaining a stable internal quantum efficiency (IQE) of approximately 70 ± 5% over a range of 103–108 incident photons. When coupled with a scintillator, the system achieved an energy resolution of 32.1% for 59.5 keV γ-rays. This work establishes lead-free double perovskite Cs2AgBiBr6 as a promising material paradigm for high-performance PCDs operating at room temperature.
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DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Zhang Zeyu,Sun Qingde,Lu Yue,Lu Feng,Mu Xulin,Wei Su-Huai,Sui Manling
Development of lead-free inorganic perovskite material, such as Cs 2 AgBiBr 6 , is of great importance to solve the toxicity and stability issues of traditional lead halide perovskite solar cells. However, due to a wide bandgap of Cs 2 AgBiBr 6 film, its light absorption ability is largely limited and the photoelectronic conversion efficiency is normally lower than 4.23%. In this text, by using a hydrogenation method, the bandgap of Cs 2 AgBiBr 6 films could be tunable from 2.18 eV to 1.64 eV. At the same time, the highest photoelectric conversion efficiency of hydrogenated Cs 2 AgBiBr 6 perovskite solar cell has been improved up to 6.37% with good environmental stability. Further investigations confirmed that the interstitial doping of atomic hydrogen in Cs 2 AgBiBr 6 lattice could not only adjust its valence and conduction band energy levels, but also optimize the carrier mobility and carrier lifetime. All these works provide an insightful strategy to fabricate high performance lead-free inorganic perovskite solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 25
·2112991
·
IF 19.924
Jiangning Li,Xianghuan Meng,Zhiheng Wu,Yanyan Duan,Ruxin Guo,Weidong Xiao,Yongshang Zhang,Yukun Li,Yonglong Shen,Wei Zhang,Guosheng Shao
Lead-free Cs 2 AgBiBr 6 double perovskite has received widespread attention because of its non-toxicity and high thermal stability. However, intrinsic bromide ion (Br – ) migration limits continuous operation of Cs 2 AgBiBr 6 -based perovskite solar cells (PSCs). Herein, an operational and simple strategy is carried out to improve the power conversion efficiency (PCE) and long-term stability of Cs 2 AgBiBr 6 -based PSCs by introducing 1-butyl-1-methylpyrrolidinium chloride (BMPyrCl) and 1-butyl-3-methylpyridinium chloride (BMPyCl) ionic liquids (ILs). The higher binding energy between Br – in Cs 2 AgBiBr 6 and cation in IL containing pyrrole can inhibit Br – migration effectively, thereby reducing film defects and improving energy level matching. The optimized PCE of 2.22% is obtained for hole transport layer-free, carbon-based PSC, which hardly degrades at 40% ± 5% relative humidity and 25 °C for 40 days. This work highlights an effective method to mitigate the halide migration in Cs 2 AgBiBr 6 perovskite, thus providing an effective route in promoting the development of lead-free double PSCs.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Bo Xiao,Yao Tan,Zijun Yi,Yubo Luo,Qinghui Jiang,Junyou Yang
The lead-free double perovskite has been proven to be one of the promising alternatives to solve the stability and toxicity problems of lead-based organic–inorganic hybrid perovskite solar cells. Here, high-quality Cs2AgBiBr6 double perovskite films with large grains and smooth surface have been prepared through a sequential-vapor-deposition method, and a low-cost and eco-friendly Cu2O film with a suitable energy level and good electrical properties was prepared as an efficient hole transport layer by vacuum vapor deposition for the first time. The Cu2O-based devices achieve a champion power conversion efficiency increasing from 1.03 to 1.52% and an enhancement of photovoltage from 1.083 to 1.198 V compared with their organic counterparts. More importantly, the Cu2O-based devices have excellent stability; they maintained the initial 96% efficiency under environmental conditions after 33 days of unpackaged storage. These results also point out the direction for the further development of these new promising perovskite solar cells.
研究领域:
光伏技术
·
材料科学
·
无机化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 30
·7982-7988
·
IF 5.976
Ling-Zhi Lei,Zhi-Feng Shi,Ying Li,Zhuang-Zhuang Ma,Fei Zhang,Ting-Ting Xu,Yong-Tao Tian,Di Wu,Xin-Jian Li,Guo-Tong Du
Halide perovskite-based photodetectors, because of their fundamental scientific importance and practical applications in the military and civil fields, have drawn worldwide attention in recent years. However, the toxicity and instability issues are major challenges for their mass production and commercialization. In this study, for the first time, we report the use of the one-step spin-coating method for the preparation of lead-free double perovskite Cs2AgBiBr6 thin films for photodetector applications. The morphology, crystallinity, and optical properties of the as-grown Cs2AgBiBr6 thin films were first investigated. Further, symmetrically structured photoconductive detectors were fabricated and characterized. The device performance was remarkable in terms of a high responsivity of 7.01 A W−1, an on/off photocurrent ratio of 2.16 × 104, a specific detectivity of 5.66 × 1011 Jones, an external quantum efficiency of 2146%, and a fast response speed of 956/995 μs. More importantly, the unencapsulated photodetectors demonstrate remarkable operational stability over the aging test (36 h, 35–45% humidity), and the photodetection ability can be almost maintained. Moreover, after storage for two weeks in ambient air, the proposed photodetectors can be efficiently sustained, demonstrating remarkable stability against water and oxygen degradation. Our results indicate that lead-free double perovskite Cs2AgBiBr6 is potentially an environmentally friendly alternative to fabricate high-efficiency and stable perovskite photodetectors for practical applications.
研究领域:
光电子学
·
材料科学
·
钙钛矿光电探测器
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）