MICROELECTRONICS RELIABILITY
·
2024
·
IF 1.6
Wei Chen,Shuo Feng,Xu Liu,Dong Hu,Xu Liu,Xi Zhu,Qi Yao,Xuejun Fan,Guoqi Zhang,Jiajie Fan
Sintered nanocopper (nanoCu) paste, exhibiting excellent electrical, thermal, and mechanical performances, offers promise for interconnections in wide bandgap (WBG) semiconductors operating at higher temperatures. However, sintered nanoCu is prone to severe corrosion in environments containing H 2 S, with on-site characterization methods for the composition of corrosion products currently lacking. In this study, a novel method was proposed for the rapid characterization of corrosion products during the corrosion process based on hyperspectral imaging (HSI) technology. Sintered nanoCu samples were subjected to 336 h H 2 S gas corrosion tests with bulk Cu as the reference, followed by correlating the corrosion element content with hyperspectral characteristic parameters. Then, the morphology and composition of corrosion products were researched using focused ion beam scanning electron microscope (FIB-SEM) and transmission electron microscope (TEM) analysis. The results showed that (1) during the corrosion process, a linear relationship was established between the Cu, O elemental atomic contents on the sample surfaces and their hyperspectral characteristic parameters. (2) The elemental atomic content of S exhibited an exponential relationship with the characteristic parameter. (3) The change rate in the spectral characteristic parameters during the corrosion process reflected the severity of corrosion, which was confirmed by comparing the thickness of the corrosion products of the sintered nanoCu and bulk Cu. This study offers a foundation for the further investigation of rapid on-site characterization of sintered nanoCu corrosion involving H 2 S.
研究领域:
材料科学
·
电子封装技术
·
表面分析技术
✓ 已验证
产品关联
DOI
高影响因子
Device
·
2023
·
IF 0
Qiaoyan Ma,Mengen Ma,Liming Liu,Peng Yang,Wujie He,Xing Zhang,Jianzha Zheng,Cuiling Zhang,Chong Liu,Shaohang Wu,Yousheng Wang,Yaohua Mai
The defects presented at three-dimensional wide-band-gap (WBG) perovskites can be passivated by the in situ formed two-dimensional/three-dimensional bulk heterostructures incorporating long-chain alkylamine oleylammonium ligands. As-fabricated WBG perovskite solar minimodules (PSMs) with six subcells connected in series yield record efficiencies of 19.20% and 43.54% with superb high open-circuit voltage ( V oc ) of 7.40 V and 6.49 V (average V oc of 1.233 V and 1.08 V for each subcell) under one-sun and light-emitting diode (1,000 lux and 3,000 K) illumination, respectively. Such results represent an important step in the area of indoor photovoltaics and also further confirm that indoor WBG PSMs have great potential to achieve higher efficiency toward the theoretical limit.
研究领域:
材料科学
·
能源工程
·
光学
✓ 已验证
DOI
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 21
·6253-6261
·
IF 7
Hongshan Wang,Xueting Pan,Wang Zhao,Yu Chu,Junjie Li
Developing high-performance infrared (IR) nonlinear optical (NLO) materials is essential for modern laser technology, but challenging due to the competition of the NLO coefficient and band gap in the structure. Based on the “electronic structure engineering bucket effect” and systematic experimental investigations on the AIIBIICIVD4VI family, three new alkaline earth metal sulfides Mg0.6Cd1.4GeS4, CaCdGeS4, and BaZnGeS4 have been developed. The compounds show a structural change from the Pnma (CaCdGeS4) to the Fdd2 (BaZnGeS4) space group. Among them, BaZnGeS4 exhibits a phase-matching NLO response of ∼0.8× AGS, a wide band gap of 3.36 eV, and a high laser-induced damage threshold of ∼5.4× AGS, achieving a good balance between the NLO response and band gap, which makes it an excellent IR NLO material. Theoretical calculations show that the NLO effects of BaZnGeS4 originated from the [ZnS4] and [GeS4] NLO-active motifs. The results indicate that BaZnGeS4 is a promising anti-laser damage IR NLO material and enriches the chemical diversity of the AIIBIICIVD4VI family.
研究领域:
材料科学
·
光学工程
·
固体物理
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Xing Zhang,Qiaoyan Ma,Yousheng Wang,Jianzha Zheng,Quanxi Liu,Liming Liu,Peng Yang,Wujie He,Ye Cao,Weiyuan Duan,Kaining Ding,Yaohua Mai
Phase heterogeneity of bromine–iodine (Br–I) mixed wide-bandgap (WBG) perovskites has detrimental effects on solar cell performance and stability. Here, we report a heterointerface anchoring strategy to homogenize the Br–I distribution and mitigate the segregation of Br-rich WBG-perovskite phases. We find that methoxy-substituted phenyl ethylammonium (x-MeOPEA+) ligands not only contribute to the crystal growth with vertical orientation but also promote halide homogenization and defect passivation near the buried perovskite/hole transport layer (HTL) interface as well as reduce trap-mediated recombination. Based on improvements in WBG-perovskite homogeneity and heterointerface contacts, NiOx-based opaque WBG-perovskite solar cells (WBG-PSCs) achieved impressive open-circuit voltage (Voc) and fill factor (FF) values of 1.22 V and 83%, respectively. Moreover, semitransparent WBG-PSCs exhibit a PCE of 18.5% (15.4% for the IZO front side) and a high FF of 80.7% (79.4% for the IZO front side) for a designated illumination area (da) of 0.12 cm2. Such a strategy further enables 24.3%-efficient two-terminal perovskite/silicon (double-polished) tandem solar cells (da of 1.159 cm2) with a high Voc of over 1.90 V. The tandem devices also show high operational stability over 1000 h during T90 lifetime measurements.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE Transactions on Components Packaging and Manufacturing Technology
·
2024
·Vol. 14
·期 1
·10-17
·
IF 2.3
Bowen Zhang,Xinyan Lu,Haoxiang Ma,Di Wang,Yun-Hui Mei
The spontaneous aggregation and weak stability of nanosilver particles largely overshadowed the application of nanosilver paste as die-attach materials in wide bandgap (WBG) devices. Taking advantage of the self-decomposition of silver-ammonia complexes to form silver particles, a novel particle-free silver paste was successfully developed to achieve higher sintering driving force as well as bonding quality. The proposed silver paste not only promotes the decomposition of silver complex but also reduces the oxygen requirement during the decomposition process, which significantly increases the shear strength from 23.8 to 59.4 MPa. The crystallization behavior and microstructure evolution confirm that the temperature required for the formation of silver particles in the proposed silver paste was reduced to 150 °C. At the same time, the necking growth also occurred at the low temperature of 150 °C, which is much lower than previous research and successfully confirms the higher sintering driving force of the proposed silver paste. More importantly, the proposed sintered silver paste exhibited high thermal stability, and the overall shear strength degradation was only 29.5% after 1000 cycles of thermal shock test (TST). The high sintering driving force combined with the high thermal reliability of the proposed silver-complex paste enables the development of high-performance WBG semiconductors with superior mechanical and electrical properties.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2024
·
IF 6.7
Jianbo Xin,Yue Gao,Chenghao Zhang,Le Yang,Sushi Liu,Ke Li,Minghao Zhou,Yang Liu,Jing Zhang,William Cai
Copper (Cu) particle sintering is widely regarded as one of the most ideal interconnect technologies for wide band gap semiconductors owing to its potential for low-temperature curing while withstanding a higher working temperature. Nevertheless, the strict requirements for sintering conditions and high costs limit the widespread application of Cu sintering technology. In this paper, a simple vehicle was introduced into Cu paste formulation to achieve an effective sinter bonding even using commercially available sub-micron or even micrometer Cu particles (C-Cu particles) with the in-situ generation of composite Cu particles. This innovative vehicle comprises Cu salt, a combination of capping agents and reducing agents. The addition of the hybrid capping agent binds Cu atoms to the surface of the C-Cu particles and allows the generated Cu particles (G-Cu particles) produced from the vehicle to grow on their surface, resulting in the in-situ generation of composite Cu particles. Based on the in-situ generated composite Cu particles, sintering experiments were conducted at designated temperatures (200 °C, 225 °C, 250 °C) for various durations (3 min, 5 min, 10 min) in a N 2 atmosphere under different pressures (10 MPa, 15 MPa, 20 MPa). A reliable Cu sintered joint with a high shear strength of 41.3 MPa can be achieved at a low temperature (200 °C) using 500 nm C-Cu particles. Moreover, the joints sintered with large size (>3 μm) particles at 250 °C could also reach 43.3 MPa. The in-situ generated composite Cu particles accomplish the transformation of low-energy interfaces of C-Cu/C-Cu to high-energy interfaces of G-Cu/G-Cu, which in turn facilitates low-temperature sintered connection of C-Cu particles and reliable sintered joints formed of large size C-Cu particles. These findings improve the feasibility of Cu sinter bonding in practical applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 16
·2300736
·
IF 9
Jiazheng Zhou,Linan Wang,Yu Chu,Hongshan Wang,Shilie Pan,Junjie Li
The exploration of antilaser damage wide bandgap infrared (IR) nonlinear optical (NLO) materials is urgent but challenging. Herein, by introducing the idea of fluorination into chalcogenides, a wide bandgap IR NLO material Na 3 SiS 3 F with unprecedented [SiS 3 F] tetrahedra is designed and synthesized. Na 3 SiS 3 F shows a wide bandgap of 4.75 eV (the largest one in the reported quaternary metal chalcogenides), resulting in a high laser damage induced threshold of ≈5 × AgGaS 2 (AGS). Meanwhile, the compound has a moderate NLO response (≈0.3 ×AGS) with phase-matching behavior, large birefringence (0.15@1064 nm), and wide IR transparent region. The introduction of fluorine breaks the structural symmetry and broadens the highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap, polarizability anisotropy, and hyperpolarizability of the Si–S tetrahedral unit. The results indicate that Na 3 SiS 3 F is a promising IR NLO material for the high-power laser application and open an avenue for the design of new wide bandgap IR NLO materials based on NLO-active [SiS x F 4− x ] ( x = 1, 2, 3) mixed anionic tetrahedral group.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xuzheng Feng,Xing Li,Zhuoxin Li,Yufei Xue,Xianggang Chen,Xiaoxu Sun,Jixiang Tang,Shuyi Liu,Zishuo Wang,Yuhang Xie,Rui Jia,Songyuan Dai,Guoping Gao,Molang Cai
Wide-bandgap perovskite solar cells (WBG PSCs) have been receiving increasing focus due to the ideal application in tandem photovoltaics. Nonetheless, WBG perovskites tend to form high-density trap states, causing serious nonradiative recombination and phase segregation, which is detrimental to the efficiency and stability of WBG PSCs. In this work, a dual-field passivation strategy facilitated by isopropylamine hydroiodide (i-PAI) is introduced, in effect, showing both the molecular dipole field passivation and interface electric field passivation. This strategy reduces the charge trap density of WBG perovskite and suppresses the phase segregation, which is supported by the analysis of the experimental data and simulation results. Moreover, the dual functional passivation mitigates the open-circuit-voltage (VOC) deficit of the WBG (1.65 eV) PSCs to 0.39 V and increases the efficiency to a competitive value of 22.21%. The device also exhibits excellent photostability, maintaining 84.2% of the initial efficiency after 1080 h of illumination under 1-sun white LED. This work showcases a pivotal pathway to defect passivation that can markedly enhancing both the efficiency and stability of wide-bandgap perovskite solar cells.
研究领域:
材料科学
·
能源技术
·
光伏研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Teng Wang,Jiachun Cao,Juan Li,Juntian Li,Didi Li,Shaobin Wang,Zhimin Ao
Wide-bandgap semiconductors are generally effective for the photocatalytic degradation of VOCs under UV light irradiation. However, we found that various VOCs could be effectively degraded and even mineralized by a variety of wide-bandgap semiconductors under visible light irradiation. The findings of our study indicate that adsorption of VOCs on catalysts generated a narrow bandgap between the ground state of the adsorbed VOCs and the conduction band of the catalysts. Such a bandgap induced visible light absorption, generating photoelectrons that are subsequently transferred from the VOCs to the conduction band of the catalyst. The photoelectrons are then captured by the surrounding oxygen, producing reactive superoxide radicals to attack the VOCs, leading to their degradation and mineralization. The degradation efficiency of VOCs by semiconductors under visible light is greatly dependent on the types of semiconductors and VOCs. This study uncovers a new mechanism for wide-bandgap semiconductor photocatalytic degradation of VOCs in visible light irradiation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Yulei Yuan,Houya Wu,Junjie Li,Pengli Zhu,Rong Sun
The development of WBG (wide bandgap) semiconductors has put forward higher requirements for packaging and interconnection technology. Cu sintering is widely considered as an advanced interconnection technology which can be used in high temperature and high power density service. In this paper, a new type of self-reducible Cu nanoparticle paste was proposed to solve the problems of easy oxidation and high sintering temperature of normal Cu nanoparticles. The proposed Cu paste was developed by mixing formic acid treated Cu nanoparticles, reducing solvents and MOD (metal organic decomposition) solutions. Based on the new type of self-reducible Cu nanoparticle paste, Cu-Cu bonding experiments were carried out with different bonding temperature and time, and a reliable Cu-Cu joint with a high shear strength of 52.01 MPa can be achieved at 250 °C under ambient condition, without any assistance of reducing or inert atmosphere. In addition, the MOD assisted self-reduction and sintering mechanism was proposed after shear strength testing, element composition analyzing, cross-sectional morphology and fracture structure observation, which can provide an effective theoretical support for the practical application of Cu-Cu bonding.
研究领域:
材料科学
·
电子封装技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2023
·
IF 9.3
Xiao Chen,Cong Geng,Xinxin Yu,Yishuai Feng,Cheng Liang,Yong Peng,Yi-bing Cheng
Spray coating is an emerging technique, paving the way for the commercialization of perovskite . However, it still faces challenges in the preparation of wide-bandgap (WBG) perovskite solar cells (PSCs) for tandem photovoltaic devices . Applying a two-step evaporate-spray method, and an additive engineering strategy, where n-propylammonium chloride is introduced in spray processing, we fabricate efficient and stable methylammonium-free (MA-free) WBG PSCs. The propylammonium cation plays a role in passivating grain boundaries, which resulted in the reduction of vacancy defects on the surface of films. Cl − plays a big part in the crystal growth process. After the addition of PACl, preferred crystalline orientation, larger grain size, and reduced trap density in perovskite films are obtained. Finally, the champion WBG PSC (Energy gap (E g ), E g ≈ 1.68 eV) delivers a power conversion efficiency (PCE) over 19%, which is the highest efficiency of the WBG PSCs prepared by the evaporate-spray method, as compared to pristine devices with the highest PCE of 16.59%. Additionally, the barrier against moisture formed at the surface of films significantly enhances humidity stability of the photovoltaic (PV) device.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 7
·3307-3316
·
IF 10.733
Qisheng Tu,Changquan Tang,Qingdong Zheng
Wide-bandgap (WBG) polymers exhibit strong absorption bands in the short wavelength region, and they can offer complementary absorption when blended with their low-bandgap (LBG) counterparts in multi-junction, ternary-blend, or non-fullerene polymer solar cells (PSCs) thereby further enhancing power conversion efficiencies (PCEs) of organic solar cells. In this work, two WBG polymers (PSS2 and PSS3) based on ladder-type dithienocyclopentadibenzothiophene (DTCD) are designed and synthesized successfully. PSS2 and PSS3 possess relatively deep-lying highest occupied molecular orbital (HOMO) energy levels of −5.36 and −5.46 eV with optical bandgaps of 2.01 and 1.92 eV, respectively. In combination with a non-fullerene acceptor (EH-IDTBR), PSS2 exhibited a power conversion efficiency (PCE) of 9.46% with a short-circuit current (JSC) of 15.70 mA cm−2, a fill factor (FF) of 58.3% and a VOC of 1.033 V. The 9.46% PCE is the highest among all copolymers based on ladder-type multi-ring-fused aromatics. With EH-IDTBR, PSS3 showed an inferior PCE of 4.74% with an enlarged VOC of 1.138 V. Furthermore, the best-performing PSS2-based device showed excellent stability with a PCE of 9.03% after storage for 120 days, which is 95% of its original value. Our results indicate that the ladder-type DTCD is a promising building block for designing WBG semiconductors for photovoltaic applications.
研究领域:
材料科学
·
有机光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）