ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Jiaxing Zhu,Ciyu Ge,Borui Jiang,Xiang Zhang,Jiajun Luo,Jiang Tang
Tin-halide perovskites (THPs) offer a promising alternative to lead-halide perovskites (LHPs), addressing environmental concerns while providing excellent optoelectronic properties. However, the performance of THP light-emitting diodes (LEDs) remains inferior to their lead-halide counterparts due to challenges such as Sn 2 ⁺ oxidation, rapid crystallization, and high defect densities. Here, for the first time, a multifunctional Lewis-base reducing ligand triphenylphosphine (TPP) is reported, which simultaneously suppresses Sn 2+ oxidation and passivates defects in 2D THPs TEA 2 SnI 4 (TEA represents 2-thienylethylamine). The P atom in TPP, with its lone pair electrons on the 3p orbital, has low electronegativity and high electron density, which can effectively suppress Sn 2+ oxidation. Furthermore, σ-donation and π-conjugation effects from the three phenyl groups in the TPP molecule enable it to strongly coordinate with Sn 2+ , which passivates defects in TEA 2 SnI 4 . These properties enhance the stability and optoelectronic properties of THPs. When the optimized THP films are implemented as active layers in LEDs, they exhibit a narrow electroluminescence full-width at half-maximum of 28 nm, Commission Internationale de l'Eclairage x-coordinate exceeding 0.7, and a peak external quantum efficiency of 10.12%, sevenfold higher than the pristine devices. This work demonstrates the potential of molecular additives to enhance the device performance of tin-based perovskites.
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
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhihang Zhang,Wenjing Zhai,Guangyuan Li,Wenhao Zheng,Xinyu Li,Lin Huang,Liufang Chen,Lin Lin,Guoliang Yuan,Zhibo Yan,Jun-Ming Liu
Tin halide perovskites are rising as promising candidates for next-generation optoelectronic materials due to their good optoelectronic properties and relatively low toxicity. However, the high defect density and the easy oxidation of Sn2+ have limited their optoelectronic performance. Herein, we report the treatment of the FASnI3 (formamidinium tin, FA) perovskite film by a bifunctional cesium fluoride (CsF) additive, which improves the film quality and significantly enhances the photoelectric performance. The responsivity of the perovskite-based photodetector (PD) with an optimal CsF concentration of 15% is over 60 times larger than that of the PD without CsF. It indicates that both the Cs substitution and the fluoride anion additive from CsF inhibit the oxidation of Sn2+, optimize the crystal growth, and passivate the defects, demonstrating the dual roles of the CsF additive in improving the photoelectric performance. This work offers valuable insights into the additive selection for developing high-quality tin-based perovskite films and devices.
研究领域:
材料科学
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光电子学
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纳米技术
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
P. H. Shi,W. J. Zhai,Y. J. Ma,W. H. Zheng,J. S. Li,L. Huang,Y. R. Ren,X. Peng,L. Lin,Z. B. Yan,J.-M. Liu
The tin halide perovskites as a lead-free alternative for optoelectronics have attracted considerable attention due to their remarkable optoelectronic performance and reduced environmental toxicity. However, a major challenge remains regarding the stability issue, primarily due to the oxidation of Sn2+ to Sn4+ under ambient conditions, which leads to material degradation and poor long-term performance. Herein, we report the enhanced performance of the FASnI3 photodetector by incorporating 4-trifluoromethyl benzyl ammonium iodide (TFMBAI) into the precursor solution. Under a light intensity of 5 mW/cm2, the responsivity at 685 nm increases to 0.325 A·W–1, achieving an enhancement of nearly 57.5 times compared with the unmodified sample. Additionally, the device exhibits a broadband photoresponse ranging from 415 to 980 nm. By optimizing the addition of TFMBAI, we have reduced the proportion and defect states of Sn4+, successfully promoted the oriented crystal growth and passivated defects, and achieved a more stable, uniform, and pinhole-free perovskite film, thereby enhancing both carrier mobility and performance stability. Our results demonstrate the great potential of TFMBAI for applications in nontoxic and highly stable tin halide perovskite photodetectors.
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 19
·2313833
·
IF 18.5
Andrew Balilonda,Mengyu Du,Ziqi Li,Wenbo Li,Wen Mei,Man Yui Leung,Guan Wu,Xiaoming Tao,Wei Chen
Perovskite based on Sn have attracted extensive attention to address the toxicity challenge associated with Pb-based perovskite solar cells. However, Sn-based perovskite solar cells（SPSCs）are notable for their poor stability and loss of efficiency due to rapid oxidation of Sn 2+ to Sn 4+ in air. To slow down the rapid oxidation, a number of antioxidants are suggested. Nevertheless, the antioxidant normally gets oxidized to non-antioxidizing by-products in a single-stage redox reaction and loses the function of oxidation prevention. Herein, vanillin is introduced, a natural antioxidant with a double-staged redox reaction to inhibit the oxidation of Sn 2+ or reduce Sn 4+ back to Sn 2+ , which improves the efficiency and prolongs the open-air stability of SPSCs. With 7.5% vanillin doping, an outstanding efficiency of 13.18% is achieved. Moreover, exposure of the solar cell to 160 W microwave irradiation for 3 minutes resulted in significant efficiency recovery from 88% to 96.5% at 812 hours and from 35.7% to 65.4% after 2200 hours of aging. This work reveals the potential of natural antioxidation and short microwave irradiation as suitable approaches to elevate the efficiency and lifetime of SPSCs.
研究领域:
光伏学
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材料科学
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可再生能源
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纳米技术
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2024
·Vol. 14
·期 26
·2401114
·
IF 24.4
Qin Li,Junjie Ma,Xuanchen Xu,Peng Gao,Meng Cai,Mengqi Han,Jing Yang,Yiqiang Zhang,Yanlin Song
The improvement of photovoltaic and stability performance of tin (Sn)-based halide perovskite solar cells is impeded by notorious oxidation issues and Anderson localization. Despite previous implements in antioxidation through the incorporation of Lewis base additives, there still exist ongoing uncertainties surrounding its complex interaction mechanisms. A perplexing phenomenon regarding accelerated oxidation in acrylic acid is discovered that deviates from conventional Lewis base–acid reaction. The underlying insights into the deprotonation of acrylic acid followed by the formation of a “tripod” ionic bonding form are provided, which results in amplifying the delocalization effect of electrons of Sn 2+ . Furthermore, with the assistance of acrylamide and acrolein, synergistic enhancement in terms of the antioxidation and suppression of Anderson localization can be achieved — a concept referred to as “Dual Synergistic Engineering”. This suppresses the oxidation of Sn 2+ and reduces Sn 4+ content by ≈76%. Meanwhile, the diffusion length is prolonged significantly from 195.9 to 458.9 nm. The optimized all-inorganic Sn/Pb-based perovskite solar cells exhibit a power conversion efficiency of above 14% with enhanced stability. These findings provide an alternative viewpoint for comprehending the impact of chemical interaction on oxidation and crystal growth in Sn/Pb-based perovskites.
研究领域:
材料科学
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光伏技术
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钙钛矿太阳能电池
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固体物理
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化学键合
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半导体材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）