JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Zitong Feng,Shuo Sun,Siyu Zhang,Wanlang Zou,Nan Hang,Linpei Zhou,Xiangyu Wei,Yuxia Sun,Jian Wen,Hongri Liu
Sb 2 S 3 has been paid extensive attentions as absorber for solar cells. Comparing with some oxides , CdS exhibits excellent compatibility to Sb 2 S 3 therefore is most commonly used as buffer layer (BL) materials for Sb 2 S 3 solar cells. Proper passivation can enhance the performance of CdS buffer layer thus raising the performances of Sb 2 S 3 solar cells. Herein, we put forward a self-passivation strategy to enhance the performance of CdS by a two-step deposition process to fabricate the self-passivated CdS BL. First, we adopted spin coating combined with annealing process to prepare flaked CdS on FTO, then we performed passivation process to the CdS by depositing another layer of CdS with chemical bath deposition (CBD) method. After Sb 2 S 3 was deposited on the self-passivated CdS by hydrothermal method , a solar cell with FTO/CdS (∼90 nm)/Sb 2 S 3 (160 nm)/Spiro-OMeTAD(48 nm)/Ag(32 nm)structure was obtained by deposition of hole transport layer and Ag electrodes. Comparing with the single spin-coating processed CdS BL or single chemical bath deposited CdS BL, the self-passivated CdS presents better performance. The CBD process presents distinctive passivation effects to the first layer. In consequence, we obtained the highest PCE of 6.04 % in the Sb 2 S 3 solar cells on the self-passivated CdS BL. The present work supplies a unique route to enhance the performances of CdS buffer layer.
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
Nanomaterials
·
2022
·Vol. 12
·期 15
·2624
·
IF 5.719
Jiayin Wu,Qilin Lu,Hanchen Wang,Biao Huang
Based on the self-passivation function of chitosan, an efficient, and green synthesis strategy was applied to prepare chitosan carbon dots (CDs). The quantum yield of carbon dots reached 35% under the conditions of hydrothermal temperature of 200 °C, hydrothermal time of 5 h, and chitosan concentration of 2%. Moreover, the obtained carbon dots had high selectivity and sensitivity to Fe3+. Based on the Schiff base reaction between the aldehyde groups of dialdehyde cellulose nanofibrils (DNF) and the amino groups of CDs, a chemically cross-linked, novel, fluorescent composite film, with high transparency and high strength, was created using one-pot processing. Knowing that the fluorescence effect of the composite film on Fe3+had a linear relationship in the concentration range of 0–100 μM, a fluorescent probe can be developed for quantitative analysis and detection of Fe3+. Owing to their excellent fluorescent and mechanical properties, the fluorescent nanocomposite films have potential applications in the fields of Fe3+detection, fluorescent labeling, and biosensing.
研究领域:
材料科学
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生物传感
·
化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Xin Liu,Xiaosong Zhang,Lan Li,Jianping Xu,Shuili Yu,Xiaokai Gong,Jiajia Zhang,Hao Yin
Perovskite quantum dots (PQDs) are among the most important luminescent semiconducting materials; however, they are unstable. Exposure to light, heat, and air can lead to irreversible degradation, which results in fluorescence quenching. Therefore, defects in PQDs significantly limit their practical application. Herein, we describe a simple method to enhance the photostability of CsPbBr3/nCdS QDs, which involves doping their shells with aluminum. The temperature-dependent photoluminescence (PL) of colloidal CsPbBr3/nCdS/Al2O3 QDs is investigated, and the thermal quenching of PL, blue shift of the optical band gap, and PL line width broadening are observed in each QD sample. Al2O3 layers on the CsPbBr3/nCdS QDs can effectively prevent photodegradation. Nonlinear, temperature-dependent exciton–phonon coupling and lattice dilation leads to radiative and nonradiative relaxation processes at temperatures ranging from 10 to 300 K; moreover, changes in the band gap and PL spectral line broadening are observed.
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2019
·
IF 0
Ershuai Jiang,Jin Yan,Yuqian Ai,Nan Li,Baojie Yan,Yuheng Zeng,Jiang Sheng,Jichun Ye
In this work, we present the self-passivation of tin oxide (SnO x ) electron transporting layer (ETL) induced by manipulatively filling the oxygen vacancies for perovskite solar cells (PSCs). The oxygen component of SnO x ETL is tuned by the annealing under the oxygen (O 2 ) atmosphere to control the trap state density for high electron collection efficiency. With increasing the O 2 content when annealing, oxygen vacancies of SnO x ETL are filled gradually, with the x of SnO x being up to 1.84, while the crystalline structure grown better to be rutile. Furthermore, the measurement of electron transport dynamic demonstrates that the SnO x ETL is benefit for electron collection after O 2 -annealed, and receiving high power conversion efficiency (PCE) of PSCs. The PSC based on the O 2 -annealed SnO x ETL yields an average PCE of over 19%, much higher than 17.81% of that after N 2 -annealing. The O 2 -annealed PSC gives a champion PCE of 20.40%, with a short current density of 24.41 mAcm −2 , an open circuit voltage of 1.14 V and a fill factor of 73.37%. Therefore, the annealing is an efficient and simple way to control the quality of SnO x ETL for the high performance PSCs.
研究领域:
材料科学
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能源工程
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光伏技术
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产品关联
DOI
Advanced Optical Materials
·
2020
·Vol. 8
·期 6
·1901390
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IF 8.286
Hongting Chen,Lianwei Fan,Rui Zhang,Chunxiong Bao,Haifeng Zhao,Wei Xiang,Wei Liu,Guangda Niu,Runda Guo,Louwen Zhang,Lei Wang
Formamidinium lead bromide (FAPbBr 3 ) nanocrystals (NCs) demonstrate great potential in light-emitting diode (LED) applications due to their pure green emission and excellent stability. However, the abundant defects at the surface of the NCs act as charge trapping centers and significantly increase the trap-assisted nonradiative recombination channels, hampering the performance improvement of LEDs based on FAPbBr 3 NCs. Herein, a facile self-passivation strategy of the surface defects is developed by introducing excess formamidinium bromide (FABr) during the colloidal synthesis of NCs, leading to much improved photoluminescence quantum yield (PLQY) of the obtained NCs. In addition, enhanced charge transport property is measured in the assembled films owing to the simultaneously declined insulating ligands at the surface of NCs. The molar ratio of FABr and PbBr 2 is rationally optimized during the synthesis of NCs and high-efficient green-emissive LEDs are fabricated with a champion current efficiency of 76.8 cd A −1 , corresponding to an external quantum efficiency of 17.1%, which is among the best-performing green LEDs based on perovskite NCs so far.
研究领域:
材料科学
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光电技术
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 39
·14737-14745
·
IF 8.067
Mengyu Guan,Yunlong Xie,Yupeng Wang,Zhuojie He,Lei Qiu,Jun Liu,Keqiang Chen,Shaojiu Yan,Guogang Li,Zhigao Dai
All-inorganic perovskite nanocrystals (NCs) are considered as new candidates for low-cost semiconductor luminescent materials. Plentiful efforts have been made to improve the efficiency of perovskite NCs and reveal the mechanism by ion doping with the same valence and different ionic radii. However, only a few selected metal ion dopants can efficiently enhance the luminescence performance of NCs, and some underlying mechanisms are not clear. Here, we employ the opposite strategy to show how to enhance the photoluminescence quantum yield (PLQY) of CsPbBr3 NCs via Sr2+ and La3+ with similar ionic radii and different valence states. With the optimization of doping conditions, the PLQY of divalent Sr2+ and trivalent La3+ doped CsPbBr3 NCs can increase to 87%, but the enhancement mechanisms are the reduction of bromine vacancy defects in the bulk and surface of CsPbBr3 NCs to increase radiative recombinations, respectively. Divalent Sr2+ doping can eliminate halide vacancies and decrease the formation of defect states and nonradiative recombinations. Based on this mechanism, in order to achieve charge balance, trivalent La3+ doping establishes Br-rich conditions due to the absorptive effect of Br, and forms CsPbBr3@Br− NCs as the core–shell-like structures, which induces self-passivation of surface defects, thereby increasing the radiative recombination on the surfaces. Density functional theory calculations confirm the experimental conclusions, showing that Sr2+/La3+ dopants enrich the conduction band edge states of CsPbBr3, resulting in enhanced photoluminescence. This work sheds light on the highly efficient luminescence of divalent and trivalent metal ion-doped halide perovskite NCs and their enhancement mechanisms, illustrating their potential applications in fluorescence anti-counterfeiting.
研究领域:
材料科学
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光学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 10
·6374-6384
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IF 4.22
Qi Xingnan,Zhang Tingting,Tan Furui,Mei Yantao,Huang Junyi,Yue Gentian,Gao Yueyue,Liu Rong,Dong Chen,Zhang Lisheng,Zhang Weifeng
Abstract Defect passivation management of perovskite films is of great importance in improving the performance of perovskite solar cells. Various in situ or post-passivation strategies were adopted to modify the optoelectric properties of perovskite films. However, these modifications increased the fabrication complexity and cost of the devices. Here, we developed a facile self-passivation strategy to effectively decrease charge trap states and suppress the non-radiative recombination loss in perovskite films. By simply aging the precursor solution, we found that the fabricated perovskite films possess residual PbI 2 phase that could decrease trap density, enhance the radiative recombination intensity, and facilitate charge transfer and collection. Therefore, the solar cells with this self-passivated perovskite film generated an increased efficiency of 21.1% compared to that of 19.9% for the control devices from fresh precursor solution. Graphical abstract
研究领域:
材料科学
·
光伏技术
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Boning Han,Shichen Yuan,Tao Fang,Fengjuan Zhang,Zhifeng Shi,Jizhong Song
Metal halide perovskites have been focused as a candidate applied as a promising luminescent material for next-generation high-quality lighting and high-definition display. However, as perovskite films formed, high density of defects would be produced in solution processing inevitably, leading to low exciton recombination efficiency in light-emitting diodes (LEDs). Herein, a facile and novel self-passivation strategy to inhibit defect formation in perovskite films for constructing high-performance LEDs is developed. For the first time, we introduce 1,4,8,11-tetraazacyclotetradecane (cyclam) in perovskite precursor solution, and it spontaneously passivates defect states of CsPbBr3-based perovskites by coaction between amine and uncoordinated lead ions during spin-coating without an anti-solvent process. Furthermore, as a delocalized system, cyclam also possesses chemical properties that facilitate exciton transportation. The proposed passivation strategy boosts the external quantum efficiency from 1.25% (control device) to 16.24% (cyclam-passivated device). Furthermore, defect passivation is also conductive to reduce LED degradation paths and improve device stability as the extrapolated lifetime (T50) of LEDs at an initial brightness of 100 cd/m2 is increased from 0.9 to 127 h. These findings indicate that the introduction of cyclam is highly effective to enhance the performance of LEDs, and such a strategy in effectively reducing the defects could be also applied in other perovskite-based devices, such as lasers, solar cells, and photodetectors.
研究领域:
材料科学
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光电学
·
半导体物理
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Zeyu Huang,Hao Li,Yuhua Xiao,Qinhao Zhang,Pan Liu,Liankui Wu,Fahe Cao
Ensuring the long-term durability and safety of galvanized steel structures in industrial and environmental applications requires a deep understanding of their corrosion resistance, particularly at defects such as cut edges and scratches. These sites often initiate localized corrosion due to micro-environmental inhomogeneities. This study investigates the dynamic corrosion behavior of galvanized Zn/Q235 steel couples by integrating macro-electrochemical testing with in-situ high-resolution scanning electrochemical microscopy (SECM) to reveal the underlying interfacial physicochemical mechanisms. While macro-electrochemical measurements indicated significant passivation, with the corrosion current density decreasing by over an order of magnitude to 1.00 × 10⁻ 6 A·cm⁻ 2 after 24 h, micro-scale SECM mapping revealed a more complex mechanism. As corrosion progressed, oxygen reduction reactions became increasingly concentrated at the Zn/Q235 interface, where localized pH stabilized near 8. This remarkable pH buffering is attributed to the continuous precipitation of zinc corrosion products, an interfacial process that consumes both Zn 2+ and OH⁻ to form a passivating layer. At simulated scratch defects, an initially aggressive galvanic coupling with steep pH gradients was gradually suppressed as these precipitates formed, demonstrating a self-passivation effect. These findings elucidate a locally driven, interfacial chemical buffering mechanism, governed by precipitate formation, that controls passive film development and slows degradation. The results establish direct links between interfacial pH regulation, corrosion-product formation, and self-passivation at defects, advancing the interface science underpinning environmentally resilient galvanized coatings.
研究领域:
腐蚀科学
·
电化学
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材料科学
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表面化学
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材料环境退化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）