JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 10
·6194-6201
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IF 3.094
Shunhang Wei,Shu Jin,Guoxiang Pan,Zuxin Li,Gang Liu,Xiaoxiang Xu
Although BaNbO 2 N has visible light absorption as far as 740 nm, its photocatalytic activity is generally very poor under ordinary conditions, being incommensurate to its light absorption properties. In this work, we introduce Ca into the B site of BaNbO 2 N to form a complex perovskite BaNb 1− x /3 Ca x /3 O 2+ y N 1− y (0 ≤ x , y ≤ 1). The presence of Ca in BaNbO 2 N has great impact on a number of important properties such as band gap value, nitrogen content, surface hydrophilicity, and defects levels. In particular, defects such as Nb 4+ species are effectively suppressed in Ca-modified BaNbO 2 N. More importantly, photocatalytic activity of BaNbO 2 N for water oxidation reactions is substantially improved after Ca modifications. Compared with pristine BaNbO 2 N, more than twofold enhancement in photocatalytic oxygen evolution is observed for BaNb 0.8 Ca 0.2 O 2+ y N 1− y ( x = 0.6). Such improvements probably stem from the suppression of Nb 4+ species in the structure as well as enhanced surface hydrophilicity after Ca modification. The facile approach by incorporating alkaline earth cations into crystal structure can be well extended to other perovskite oxynitrides whose photocatalytic activity is subject to those defective species.
研究领域:
材料科学
·
光催化化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 12
·2343-2351
·
IF 5.958
Ran Wang,Guoan Lin,Xiaoxiang Xu
La/Zr co-doped SrTaO2N has been investigated as visible-light-active photocatalysts for water reduction. Unlike previous aliovalent doping that leads to a decrease in light absorption, La/Zr co-doping largely preserves the visible light absorption of SrTaO2N. More importantly, the La/Zr co-doping not only helps to improve surface hydrophilicity and reduce particle sizes but also effectively inhibits defect formation (e.g. Ta4+) in SrTaO2N. These modifications are responsible for significant enhancements in photocatalytic H2 production. AQE as high as 0.84% was achieved at 420 ± 20 nm for Sr0.4La0.6Ta0.4Zr0.6O2N (x = 0.6), which also showed good durability and stability. Further analysis suggests that La/Zr co-doping negatively shifts the conduction band edge positions of SrTaO2N and contributes to better charge separation conditions.
研究领域:
材料科学
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能源化学
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环境科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 44
·2307389
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IF 19
Mengyang Wang,Hang Geng,Jichun Zhu,Yubo Cui,Shanheng Zhao,Junjie Fu,Dongxing Kou,Jie Sun,Chaoliang Zhao,Sixin Wu,Liming Ding,Zhi Zheng
One of the main issues that limits the efficiency of kesterite solar cells is the low diffusion and chemical activity of selenium clusters. Here, this work proposes a simple and effective pre-selenization strategy using Na 2 (Se 2 S) solution, which enables the direct introduction of hyperactive Se 2 , Se 3 , and Se 4 into the precursors. The results demonstrate that Se 2 , Se 3 , and Se 4 promote the formation of the Cu 2-x Se liquid phase and enhance the diffusion of elements from different micro-regions. Consequently, the ratios of Cu/(Zn + Sn) and Sn/Zn in different micro-regions of the absorber are controlled within the optimal range, exhibiting reduced fluctuations. The controlled environment suppresses the formation of Cu Zn and Sn Zn defects, as well as [2Cu Zn + Sn Zn ] defect clusters. Finally, a power conversion efficiency (PCE) of 12.86% is achieved, which is the highest PCE for kesterite solar cells made under ambient pressure and with N,N- dimethylformamide solvent.
研究领域:
材料科学
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太阳能技术
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产品关联
DOI
高影响因子
Solar RRL
·
2021
·Vol. 6
·期 1
·2100731
·
IF 8.582
Ruonan Zhou,Xingchong Liu,Haimin Li,Hanyu Wang,Yukun Ouyang,Xiaoli Gong,Xian Peng,Huxin Luo,Yafei Ni,Wenjing Zou,Yue Lei
Intrinsic defects are key factors that would affect the performance and stability of perovskite solar cells (PSCs). Herein, a sulfonamides additive, methyl 3-sulfamoyl-2-thiophenecarboxylate (MSTC), is introduced into the PbI 2 or FAI/MACl/MABr precursor solution, to prepare high-quality PSCs with a two-step method. After the addition of MSTC, all the devices show enhanced performance. With optimized MSTC incorporated into PSCs, the champion power conversion efficiency (PCE) of the PSCs is increased from 19.19% to 22.14%, and the stability is also improved. The MSTC-FAI based device can still maintain 89% of its initial PCE compared to 68% of the control one after 15 days in ambient condition under relative humidity of 40–50% at room temperature in dark. Test results reveal that amido group in MSTC would coordinate with PbI 2 or FAI through hydrogen bonding (NH···I), thus effectively enhancing the performance of devices. Nevertheless, the sulfonyl and carbonyl groups in MSTC would coordinate with the FAI precursor through chemical bond of C O S and C O C. And with the hydrogen bonding connection between MSTC and FAI, the inherent defects in the MSTC-FAI based device are effectively suppressed, leading to the enhanced photovoltaic performance.
研究领域:
材料科学
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能源技术
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化学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhiwei Zeng,Yuhan Meng,Zunxian Yang,Yuliang Ye,Qiuxiang Lin,Zongyi Meng,Hongyi Hong,Songwei Ye,Zhiming Cheng,Qianting Lan,Jiaxiang Wang,Ye Chen,Hui Zhang,Yuting Bai,Xudong Jiang,Benfang Liu,Jiajie Hong,Tailiang Guo,Fushan Li,Yongyi Chen,Zhenzhen Weng
Perovskite nanocrystals have absorbed increasing interest, especially in the field of optoelectronics, owing to their unique characteristics, including their tunable luminescence range, robust solution processability, facile synthesis, and so on. However, in practice, due to the inherent instability of the traditional long-chain insulating ligands surrounding perovskite quantum dots (PeQDs), the performance of the as-fabricated QLED is relatively disappointing. Herein, the zwitterion 3-(decyldimethylammonio)propanesulfonate (DLPS) with the capability of double passivating perovskite quantum dots could effectively replace the original long-chain ligand simply through a multistep post-treatment strategy to finally inhibit the formation of defects. It was indicated from theexperimental results that the DLPS, as one type of ligand with the bimolecular ion, was very adavntageous in replacing long-chain ligands and further suppressing the formation of defects. Finally, the perovskite quantum dots with greatly enhanced PLQY as high as 98% were effectively achieved. Additionally, the colloidal stability of the corresponding PeQDs has been significantly enhanced, and a transparent colloidal solution was obtained after 45 days under ambient conditions. Finally, the as-fabricated QLEDs based on the ligand-exchanged PeQDs exhibited a maximum brightness of 9464 cd/m2 and an EQE of 12.17%.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
PubMed
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 Energy Materials
·
2020
·
IF 4.473
Yiming Wang,Yanchun Yang,Chengjun Zhu,Hongmei Luan,Ruijian Liu,Lei Wang,Chenxi Zhao,Xiaogong Lv
Substitution of Zn with Mg has been reported to suppress CuZn defects, which can improve the photoelectric performance of Cu2ZnSn(S,Se)4 (CZTSSe) photovoltaic devices. In our work, the electrical property enhancement of an absorbing layer can be found by incorporating Mg content into the as-prepared precursor solution, forming an alloyed Cu2MgxZn1-xSn(S,Se)4 (CMZTSSe) phase and increasing the photoelectric performance of devices. By adjusting the doping ratio of Mg, we systemically study the impact of Mg content on the crystal structure, thickness, and electrical properties of the Cu2MgxZn1-xSn(S,Se)4 absorbing layer. Also, the photoelectric performance of Cu2MgxZn1-xSn(S,Se)4 solar cells have a large improvement, and the optimal photoelectric conversion efficiency (PCE) of 7.76% for devices is obtained. Our results offer the finding that Mg doping can optimize the electrical properties of Cu2ZnSn(S,Se)4 photovoltaic devices.
研究领域:
材料科学
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光伏技术
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产品关联
DOI
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 12
·1862-1874
·
IF 6.099
Guohui Li,Rui Gao,Yue Han,Aiping Zhai,Yucheng Liu,Yue Tian,Bining Tian,Yuying Hao,Shengzhong Liu,Shengzhong Liu,Shengzhong Liu,Shengzhong Liu,Yucheng Wu,Yucheng Wu,Yanxia Cui
Solution-processable, single-crystalline perovskite nanowires are ideal candidates for developing low-cost photodetectors, but their detectivities are limited due to a high level of unintentional defects. Through the surface-initiated solution-growth method, we fabricated high-quality, single-crystalline, defects-suppressed MAPbI3 nanowires, which possess atomically smooth side surfaces with a surface roughness of 0.27 nm, corresponding to a carrier lifetime of 112.9 ns. By forming ohmic MAPbI3/Au contacts through the dry contact method, high-performance metal–semiconductor–metal photodetectors have been demonstrated with a record large linear dynamic range of 157 dB along with a record high detectivity of 1.2×1014 Jones at an illumination power density of 5.5 nW/cm2. Such superior photodetector performance metrics are attributed to, first, the defects-suppressed property of the as-grown MAPbI3 nanowires, which leads to a quite low noise current in the dark, and second, the ohmic contact between MAPbI3 and Au interfaces, which gives rise to an improved responsivity compared with the Schottky contact counterpart. The realized high-performance MAPbI3 nanowire photodetector advances the development of low-cost photodetectors and has potential applications in weak-signal photodetection.
研究领域:
材料科学
·
光电子学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chang Miao,Meiling Ma,Yingrui Sui,Yue Cui,Zhanwu Wang,Lili Yang,Fengyou Wang,Xiaoyan Liu,Bin Yao
Environmentally benign and earth-abundant constituent’s kieserite Cu 2 ZnSn (S, Se) 4 (Cotises) is considered as a hopeful photovoltaic material. Unfortunately, the severe tail state caused by various harmful deep defects in CZTSSe absorber prevents further development of its device efficiency. Here, we report firstly that the Co was incorporated into CZTSSe films to form the Cu 2 Co x Zn 1-x Sn (S, Se) 4 (CCZTSSe) films using a two-step annealing and solution-processing technique method. Through optimized the Co/(Co+Zn) ratio, the CCZTSSe film has excellent good surface morphology and single-phase composition. Appropriate amount of Co elements replacing Zn elements in CZTSSe films can effectively reduce the degree of Cu-Zn disorder, thus inhibiting [2Cu Zn +Sn Zn ] defect clusters and Cu Zn defects. The detrimental deep defects located in the film were effectively passivated to reduce electrostatic potential fluctuations, resulting in relief of the trailing state. Therefore, a champion device having an efficiency of 7.50 % with a fill factor (FF) of 61.00 % was achieved from CCZTSSe with 3 % Co content. This work provides new insights into the impacts of Co doping in CZTSSe by a solution processed method and offers a deeper comprehension of the origin of the efficiency enhancement of CCZTSSe devices.
研究领域:
材料科学
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能源技术
·
半导体物理
✓ 已验证
DOI
高影响因子
Small Methods
·
2025
·
IF 9.1
Yaning Luo,Sheng Wang,Wenqiang Li,Xu Cao,Chengxi Zhang,Jun Dai,Lin Wang,Xuyong Yang
Metal halide perovskite nanocrystals (PeNCs) have emerged as promising materials for next-generation light-emitting diodes (PeLEDs) due to their outstanding optical properties. However, synthesis challenges such as rapid crystallization often introduce defects that degrade device performance. Herein, a dual-ligand approach employing trioctylphosphine oxide (TOPO) and phenylphosphinic acid (PPIA) is introduced to coordinate Pb 2 ⁺ ions, effectively slowing the crystallization process and minimizing defect formation. The obtained PeNCs exhibit a high photoluminescence quantum yield (PL QY) of 93%. Additionally, the PPIA ligand enhances electrical conductivity via π-electron resonance, enabling more efficient charge transport in FAPbBr 3 films. As a result, the optimized PeLEDs achieve a peak external quantum efficiency (EQE) of 24.2% and a luminance of 32 840 cd m − 2 , significantly outperforming the control devices, which exhibit an EQE of 12.1% and a luminance of 1577 cd m − 2 . Furthermore, the operational lifetime of the optimized PeLEDs is 5.3 times longer than that of the control devices. These findings offer a promising pathway for advancing the performance and stability of PeLEDs.
研究领域:
材料科学
·
光学工程
·
电子器件
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2024
·
IF 7.5
Wei Zhao,Lin Wu,Jian-Lin Chen,Jiayao Ju,Yuxi Zeng,Zihan Wu,Jintao He,Jincheng Huang,Zhuoyin Peng,Jian Chen
In recent years, hole transport layer-free all-inorganic CsPbI2Br carbon-electroded perovskite solar cells (C-PSCs) have garnered significant attention due to a trade-off between stability and photovoltaic performance. However, there are inevitably many defects generated at the surfaces or grain boundaries of CsPbI2Br perovskite films, which will serve as carrier non-radiative recombination centers, and CsPbI2Br perovskite films are sensitive to water molecules to degrade, together with energy level mismatch between CsPbI2Br perovskite and carbon electrodes. Herein, 1-benzyl-3-methylimidazolium hexafluorophosphate (1-B-3-MIMPF6), an imidazolium-based ionic liquid simultaneously containing benzene ring and fluorine atoms, was introduced for the modification of the perovskite/carbon interface. The results showed that it could effectively reduce defects, enhance carrier transfer, mitigate carrier non-radiative recombination, facilitate energy alignment, and block moisture intrusion. Therefore, the photovoltaic performance of the modified PSCs with ITO/SnO2/CsPbI2Br/1-B-3-MIMPF6/carbon architecture has been boosted with a champion power conversion efficiency (PCE) of 13.47%, open circuit voltage of 1.20 V, short circuit current density of 14.69 mA/cm2, and fill factor of 76%. Moreover, the unencapsulated modified devices exhibited an improved stability and maintained 78% of their initial PCE after 24 h storage at room temperature in a 30%–35% humidity environment, whereas the pristine devices dropped to almost zero.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy & Environmental Science
·
2017
·Vol. 10
·期 11
·2401-2410
·
IF 29.518
Ya-Fang Qi,Dong-Xing Kou,Wen-Hui Zhou,Zheng-Ji Zhou,Qing-Wen Tian,Yue-Na Meng,Xin-Sheng Liu,Zu-Liang Du,Si-Xin Wu
Although the substitution of Cu by Ag to suppress CuZn defects offers several advantages in overcoming the large open-circuit voltage (Voc) deficit for Cu2ZnSn(S,Se)4 (CZTSSe) solar cells, an excellent performance has not been achieved to date primarily due to the Fermi level pinning at the CdS/absorber interface and large recombination at the absorber/Mo interface. Herein, we developed a composition grading strategy to achieve a V-shaped Ag-graded structure with a higher Ag content on both the back and front surfaces of the (Cu,Ag)2ZnSn(S,Se)4 (CAZTSSe) layer. The key advantages of this Ag-graded structure are as follows: the higher content towards the CdS/absorber interface can create weak n-type donor defects and retard Fermi level pinning, whereas the lower content at the interlayer maintains the conductivity and light absorption; moreover, the other higher content towards Mo back contact can effectively suppress the recombination and improve the utilization of long-wave incident light. By appropriately adjusting the Ag gradient, we demonstrated a significant increase in Voc, and an unexpected conversion efficiency of 11.2% was achieved. This is the highest efficiency achieved to date for Ag-substituted CZTSSe solar cells, and the result supports a new aspect that synthesis of a composition-graded CAZTSSe absorber has great potential for future research.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）