Solar RRL
·
2021
·Vol. 6
·期 4
·2100791
·
IF 8.582
Jiabao Li,Furi Yan,Peizhi Yang,Yanyan Duan,Jialong Duan,Qunwei Tang
All-inorganic lead-free Cs 2 AgBiBr 6 double perovskite solar cells (PSCs) have attracted growing attention owing to their eco-friendly features and robust intrinsic stability. However, arising from the rapid crystal growth, the poor film quality always leads to substantial non-radiative recombination and inferior performance improvement. Herein, high-efficiency and stable Cs 2 AgBiBr 6 PSCs are obtained by introducing a functional polymethyl methacrylate (PMMA) layer at the perovskite surface to avoid direct contact between carbon and the underlying charge transfer layer, as well as to passivate the defects. When assembling into solar cells, the non-radiative charge recombination is suppressed and the interfacial charge extraction is accelerated. As a result, the carbon-electrode-based Cs 2 AgBiBr 6 PSC yields an enhanced efficiency of 2.25% with a high open-circuit voltage of 1.18 V. Moreover, the unencapsulated device exhibits superior long-term stability owing to the protection of the PMMA layer from corrosion by the extraneous water and oxygen, retaining nearly 100% of the initial efficiency after storage in 25 °C, with 5% relative humidity (RH) for 80 days and high temperature of 85 °C, and 0% RH for 60 days, respectively. A simple method of polymer passivation for enhancing the performance and stability of Pb-free Cs 2 AgBiBr 6 PSCs is provided.
研究领域:
材料科学
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可再生能源
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光伏技术
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 23
·2001557
·
IF 16.836
Xiaoqing Yang,Yonghui Chen,Pengyun Liu,Huimin Xiang,Wei Wang,Ran Ran,Wei Zhou,Zongping Shao
Perovskite solar cells (PSCs) are highly promising next-generation photovoltaic devices because of the cheap raw materials, ideal band gap of ≈1.5 eV, broad absorption range, and high absorption coefficient. Although lead-based inorganic-organic PSC has achieved the highest power conversion efficiency (PCE) of 25.2%, the toxic nature of lead and poor stability strongly limits the commercialization. Lead-free inorganic PSCs are potential alternatives to toxic and unstable organic-inorganic PSCs. Particularly, double-perovskite Cs 2 AgBiBr 6 -based PSC has received interests for its all inorganic and lead-free features. However, the PCE is limited by the inherent and extrinsic defects of Cs 2 AgBiBr 6 films. Herein, an effective and facile strategy is reported for improving the PCE and stability by introducing an N719 dye interlayer, which plays multifunctional roles such as broadening the absorption spectrum, suppressing the charge carrier recombination, accelerating the hole extraction, and constructing an appropriate energy level alignment. Consequently, the optimizing cell delivers an outstanding PCE of 2.84%, much improved as compared with other Cs 2 AgBiBr 6 -based PSCs reported so far in the literature. Moreover, the N719 interlayer greatly enhances the stability of PSCs under ambient conditions. This work highlights a useful strategy to boost the PCE and stability of lead-free Cs 2 AgBiBr 6 -based PSCs simultaneously, accelerating the commercialization of PSC technology.
研究领域:
光伏技术
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材料科学
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可再生能源
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半导体器件
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无机化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2026
·
IF 5.5
Tengyi You,Yunfei Li,Wen Li,Qiang Weng,Wenxiao Zhang,Sheng Fu,Xiaodong Li,Junfeng Fang
Cs2AgBiBr6 holds great potential as an alternative to lead-based perovskites due to its nontoxicity and relatively high stability. However, the rapid crystallization of Cs2AgBiBr6 usually induces a high defect density, leading to poor photovoltaic performance. Here we introduce thiourea (TU) and Methylammonium bromide (MABr) into the precursor solution to control the crystallization process of Cs2AgBiBr6. TU anchors Ag+ and Bi3+ to regulate the crystallization process and passivate potential defects. MABr works as a “solid solvent” to preoccupy the lattice sites for Cs+ insertion and will volatize without residuals after film annealing, inducing uniform growth of Cs2AgBiBr6. As a result, inverted Cs2AgBiBr6 solar cells show an efficiency of 0.955% with a high Voc of >1.0 V, which is much higher than that of the control device (0.459%).
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xiaoqing Yang,Huimin Xiang,Jianying Huang,Chuan Zhou,Ran Ran,Wei Wang,Wei Zhou,Zongping Shao
Lead-free inorganic Cs 2 AgBiBr 6 double perovskites have emerged as promising materials in perovskite solar cells (PSCs) to tackle the inferior stability and toxicity issues of organic–inorganic hybrid PSCs. However, the power conversion efficiencies (PCEs) of Cs 2 AgBiBr 6 solar cells are remarkably restricted by the intrinsic and extrinsic defects of Cs 2 AgBiBr 6 films. More specifically, the fast crystallization process in the formation of Cs 2 AgBiBr 6 films strongly prevents the homogeneous growth of perovskite crystals, leading to inferior Cs 2 AgBiBr 6 film quality. This work introduces a facile strategy to retard the crystallization of Cs 2 AgBiBr 6 perovskites by introducing Lewis base additives into the precursor solution. The incorporation of a strongly coordinated thiourea additive with a sulfur donor leads to the generation of a Lewis acid base adduct, which retards the crystallization process for Cs 2 AgBiBr 6 crystals, improves the quality of the Cs 2 AgBiBr 6 film, decreases the defect density and inhibits charge carrier recombination. After optimization, the cell delivers a superior PCE of 3.07%, surpassing that reported for most Cs 2 AgBiBr 6 -based solar cells in the literature, and exhibits outstanding stability with a PCE retention rate of 95% after 20 days of storage in air. This work provides an effective strategy for further improvements in the performance of inorganic lead-free Cs 2 AgBiBr 6 -based photovoltaic cells .
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
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Tao Luo,Yalan Zhang,Xiaoming Chang,Junjie Fang,Tianqi Niu,Jing Lu,Yuanyuan Fan,Zicheng Ding,Kui Zhao,Shengzhong (Frank) Liu
The emerging lead-free halide double perovskite solar cells have attracted widespread attentions due to their long-term stability and non-toxicity, but suffer from the low device performance. One efficiency-limiting factor is the improper contacts between the halide double perovskite and anode/cathode electrodes. Here, we improve the efficiency and stability of the bismuth-halide double perovskite based solar cells by a synergistic interface design for both electron and hole transport layers (ETL/HTL). The results show that the modification of the TiO 2 ETL with a thin hydrophobic C 60 layer and replacement of the lithium-doped small molecule HTL with an un-doped conjugated polymer lead to higher surface quality of perovskite film and better energy-level alignment at the contacts. As a result, the optimized device shows reduced trap density, suppressed charge recombination and enhanced charge extraction, leading to an increase of 69% in device efficiency. In addition, the device also exhibits superior stability in ambient environment, heat stress and light bias after interface optimization. This work provides an efficient strategy for the device optimization of the emerging lead-free perovskite solar cells.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 51
·2107843
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IF 18.808
Weijun Li,Lulu Liu,Mingrui Tan,Yuhong He,Chunjie Guo,Huimao Zhang,Haotong Wei,Bai Yang
Both semiconductors and scintillators have their own advantages in direct and indirect X-ray detection, respectively. However, they are also limited by their intrinsic properties and detection mechanisms. Here, a low-cost and large-area flat X-ray detector is reported by combining a cesium silver bismuth bromide (Cs 2 AgBiBr 6 ) perovskite semiconductor with a ethylenebis-triphenylphosphonium manganese (II) bromide ((C 38 H 34 P 2 )MnBr 4 ) scintillator through fast tableting processes. Cs 2 AgBiBr 6 and (C 38 H 34 P 2 )MnBr 4 can attenuate the X-ray photons to induce charge carriers that are collected through the continuous Cs 2 AgBiBr 6 grains. (C 38 H 34 P 2 )MnBr 4 blocks the Cs 2 AgBiBr 6 ions migration paths at the grain boundaries to reduce the device dark current/noise and improves the working stability. Most charges generated by (C 38 H 34 P 2 )MnBr 4 are transferred to the adjacent Cs 2 AgBiBr 6 , and recombined charges radiate light through scintillation, which will be further absorbed by the surrounding Cs 2 AgBiBr 6 perovskite, and further induce collectable charges for indirect X-ray detection, avoiding the unwanted light scattering, self-absorption, or afterglow effects of scintillators. The hybrid X-ray detector displays a high sensitivity of 114 µC Gy air −1 cm −2 to 120 keV p hard X-rays with a lowest detectable dose rate of 0.2 μGy air s −1 , showing 75 times lower detection limit compared to (C 38 H 34 P 2 )MnBr 4 scintillator, which provides a new path for X-ray flat-panel design.
研究领域:
材料科学
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医学影像
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物理学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
He Liu,Gaozhao Chen,Xiong Shen,Wentao Hao,Qiuyun Ouyang
To solve the toxicity and stability issues of traditional lead halide perovskites, Cs2AgBiBr6@TiO2 nanocomposites were synthesized via a thermal injection method. Cs2AgBiBr6 quantum dots (QDs) and Cs2AgBiBr6@TiO2 nanocomposites were dispersed in methyl methacrylate (MMA) to prepare (Cs2AgBiBr6)6/PMMA and (Cs2AgBiBr6@TiO2)6/PMMA organic glasses (OGs). The nonlinear absorption (NLA) properties of the materials were investigated using the open-aperture Z-scan technique, revealing that after compositing with TiO2, the reverse saturable absorption (RSA) coefficient of the (Cs2AgBiBr6@TiO2)6/PMMA OG increased from 194 cm GW−1 to 294 cm GW−1 at an energy of 10 µJ. This is attributed to the incorporation of TiO2, which facilitates interfacial charge separation and accelerates electron transfer, thereby significantly enhancing the RSA of Cs2AgBiBr6@TiO2. Under identical testing conditions, the optical limiting thresholds of the (Cs2AgBiBr6)6/PMMA and the (Cs2AgBiBr6@TiO2)6/PMMA OGs were measured to be 5.33 J cm−2 and 3.87 J cm−2, respectively. Compared to the (Cs2AgBiBr6)6/PMMA OG, the (Cs2AgBiBr6@TiO2)6/PMMA OG demonstrates superior optical limiting performance. Electrochemical impedance spectroscopy (EIS) measurements demonstrated that Cs2AgBiBr6@TiO2 exhibits lower impedance (Rct) and favorable photocurrent response (0.61 µA cm−2), confirming its efficient charge separation/transport capability, which further promotes the RSA effect of Cs2AgBiBr6@TiO2. These results indicate that Cs2AgBiBr6@TiO2 holds promising potential for applications in optical limiting devices.
研究领域:
材料科学
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光子学
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纳米技术
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电化学
·
光学材料
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产品关联
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 27
·19124-19133
·
IF 3.9
Zhenting Yang,Aimiao Qin,Haiqing Qin,Zhenlin Li,Yong Xiang,Hao Liu,Jinyu Qiu,Xinyu Wang
Cesium-based lead-free double perovskite materials (Cs2AgBiBr6) have garnered significant attention in the X-ray detection field due to their environment friendly characteristics. However, their substantial ion migration properties lead to large dark currents and detection limits in Cs2AgBiBr6-based X-ray detectors, restricting the detection performance of the device. In terms of process technology, ultrasonic spraying is more suitable than a spin-coating method for fabricating large-area, micron-scale perovskite thick films, with higher cost-effectiveness, which is crucial for X-ray detection. This work introduces a BA+ (BA+ = CH3CH2CH2CH2NH3+, n-butyl) source into the precursor solution and employs ultrasonic spraying to fabricate quasi-two-dimensional structured polycrystalline (BA)2Cs9Ag5Bi5Br31 perovskite thick films, developing a low-cost, eco-friendly X-ray detector with low dark current density and low detection limit. Characterization results reveal that the ion migration activation energy of (BA)2Cs9Ag5Bi5Br31 reaches 419 meV, approximately 17% higher than that of traditional three-dimensional perovskites, effectively suppressing perovskite ion migration and subsequently reducing the dark current. The (BA)2Cs9Ag5Bi5Br31-based X-ray detectors exhibit high resistivity (about 1.75 × 1010 Ω cm), low dark current density (66 nA cm−2), minimal dark current drift (0.016 pA cm−1 s−1 V−1), and detection limit (138 nGyair s−1), holding considerable promise for applications in low-noise, low-dose X-ray detection.
研究领域:
材料科学
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物理学
·
辐射探测技术
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yalin Yang,Wei Lu,Xiaolong Yang,Lyuzhou Ye
A ternary CABB/CdS–Rh heterojunction with Type-I band alignment and Rh electron trapping for synergistic charge separation. • DFT-Bader analysis quantifies Rh-induced charge redistribution, with net charge increased from 0.20 to 0.30 |e|. • CABB/CdS-Rh yields 49.15 mmol·g -1 ·h -1 H 2 (STH 0.19%) with tunable selectivity for acetaldehyde/acetal. Photocatalytic direct dehydrogenation of ethanol remains critically constrained by the narrow visible-light response and inefficient charge carrier separation of conventional photocatalysts. Herein, a Rh-modified Cs 2 AgBiBr 6 /CdS heterojunction is fabricated for coupled ethanol dehydrogenation, H 2 production and acetal generation under mild conditions. Density Functional Theory (DFT) calculations validate the tailored charge transfer behavior via Bader charge and differential charge density analyses. Bader charge analysis shows that Rh incorporation increases the interfacial net charge variation from 0.20 |e| to 0.30 |e| and introduces a local variation of 0.42 |e| around Rh sites, thereby suppressing charge recombination and promoting carrier separation. Control experiments confirm that 1D CdS nanorods deliver better charge transport than 2D CdS nanosheets, and surface cocatalyst anchoring is indispensable for efficient hydrogen evolution. Rh outperforms other tested metals (Pd, Pt, Au, Ni), achieving an H 2 evolution rate of 49.15 mmol·g −1 ·h −1 (20.24-fold that of CABB/CdS) and Solar-to-Hydrogen (STH) efficiency of 0.19%. Rh modification tunes liquid-phase product distribution, and the catalyst shows broad alcohol substrate adaptability and robust cycling stability. The synergistic heterojunction engineering and cocatalyst modification strategy presented in this work offers a promising catalyst design paradigm for the valorization of biomass-derived alcohols via photocatalytic conversion. A CABB/CdS-Rh heterojunction photocatalyst is constructed for visible-light-driven ethanol dehydrogenation. The reinforced interfacial charge redistribution, together with the Rh electron-trapping centers, effectively suppresses charge recombination, achieving efficient H 2 production of 49.15 mmol·g −1 ·h −1 with an STH EtOH efficiency of 0.19%. Systematic screening identifies Rh as the optimal cocatalyst, and the catalyst exhibits broad substrate adaptability toward various alcohols, including benzyl alcohol, cyclohexanol, and n-pentanol. This integrated design offers a versatile strategy for the dual valorization of biomass-derived alcohols into H 2 fuel and valuable chemicals. Download: Download high-res image (127KB) Download: Download full-size image
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Zhuolu Li,Yi Wu,Zhangwei Guo,Jiaxin Rui,Zhaogang Teng,Song Wang,Kai Pan
Double perovskite materials are promising lead-free alternatives due to their low toxicity and high stability. However, their large indirect bandgap limits optical performance. Morphology control offers an effective enhancement strategy. Here, cesium oleate (Cs-OA) and bromotrimethylsilane (TMS-Br) were injected into an oleic acid-free precursor. The OA present reacts with oleylamine (OAm) to form oleylammonium oleate (OAmH+·OA–), which, synergistically with OAm, enhances Ag+ and Bi3+ solubility. TMS-Br then provides bromide, triggering rapid nucleation of Cs2AgBiBr6 nanoclusters. Under thermodynamic control, these grow into uniform nanocrystals. Over time, multiple nanowires self-assemble and fuse into one-dimensional structures. Time-resolved photoluminescence shows a prolonged exciton lifetime of 19.0 ns, indicating low defect density. Temperature-dependent PL confirms a large exciton binding energy (61.1 meV), weak nonradiative recombination, and strong luminescence potential. The nanowires also exhibit excellent stability, retaining over 90% of their PL intensity after 90 days at room temperature.
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Hantao Wang,Yu Zou,Yunxuan Cao,Yaobin Li,Qinyun Liu,Yunan Gao,Bo Qu,Zhijian Chen,Dechun Zou,Lixin Xiao
Lead-free double perovskite Cs2AgBiBr6 is a promising candidate for environmentally friendly perovskite solar cells (PSCs), providing an alternative to their toxic lead-based counterparts. However, rapid crystallization and facile Br/Ag vacancy formation lead to inhomogeneous films with high trap density and disordered heterojunctions, severely limiting device performance. Herein, we develop a synergistic modification strategy using bidentate ligand RbSCN. The incorporation of RbSCN into the SnO2 precursor mitigates buried interface defects, which improves interfacial contact. Simultaneously, bidentate ligand RbSCN added to the Cs2AgBiBr6 precursor leverages its bidentate coordination capability, targeted anchoring Ag+/Bi3+ cations separately at the stoichiometric ratio, inducing ordered assembly. This facilitates homogeneous crystallization and the efficient passivation of Br vacancies. Consequently, this synergistic modification strategy yields homogeneous films with superior charge transport properties, enabling PSCs to achieve an enhanced champion power conversion efficiency of 2.16% along with exceptional stability. This work underscores homogeneous film formation as being crucial for double perovskites and provides a clear pathway for optimizing lead-free PSCs.
研究领域:
材料科学
·
光伏技术
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无机化学
·
薄膜技术
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产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Chaofan Lv,Xigui Yang,Zhifeng Shi,Lingrui Wang,Laizhi Sui,Qingyi Li,Jinxu Qin,Kaikai Liu,Zhuangfei Zhang,Xing Li,Qing Lou,Dongwen Yang,Jinhao Zang,Ran Liu,Bingbing Liu,Chong-Xin Shan
Lead halide perovskites have recently emerged as promising materials for various optoelectronic applications. However, realizing lead-free and stable perovskites with broad-band emission for the fabrication of single-component light emitters in lighting applications remains a great challenge. Here, we report an intriguing pressure-induced ultra-broad-band emission ranging from 520 to 1000 nm in lead-free Cs2AgBiBr6 thin films for the first time. The broad emission arises from self-trapped excitons associated with the large lattice distortion of an octahedron resulting from a structural phase transition under high pressure. More importantly, such broad emission is retainable upon decompression. These findings offer a new route for extending the emission spectral coverage of perovskite materials for potential lighting applications in next-generation broad-band emitters.
研究领域:
材料科学
·
光电子学
·
钙钛矿物理
·
固态化学
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DOI
高影响因子
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