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Dual-passivation of ionic defects for highly crystalline perovskite

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Dual-passivation of ionic defects for highly crystalline per...

第八届新型太阳能材料科学与技术学术研讨会

作者： haonan si Zhuo Kang Yue Zhang dressa Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing

The ionic defects in hybrid halide perovskite materials served as the recombination center severely restricts its application for solar cells. Here, we proposed a dual-passivation strategy via simply incorporating low-cost ammonium chloride to simultaneously passivate negative-and positive-charged ionic defects, as indicated by first-principles density functional theory calculation. The efficient defect modulation reduces the defect density and prolongs the carrier lifetime, thereby contributing to the highly crystalline perovskite, which is demonstrated by light-dependent kelvin probe force microscopy, transient absorption and visualized fluorescence lifetime imaging microscopy. Benefiting from these merits, the power conversion efficiency of perovskite solar cells is boosted up to 21.38%. More importantly, this dual-passivation approach can be further extended to mixed-cation perovskite systems, not limited in traditional methylammonium based perovskite only. Such methodology of simultaneously regulating ionic defects in different types may probably give impetus to effectively promote perovskite evolution.

关键词： Dual-passivation Highly crystalline perovskite Perovskite solar cells

Crystal orientation engineering of NiOx hole transport layer in perovskite solar cells

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Crystal orientation engineering of NiOx hole transport layer...

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Mingyue Shi Shuangfei Ma Hualin Wu haonan si Zhuo Kang Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing

Hybrid organic-inorganic perovskite solar cells(PSCs) have attracted great attention over the past years due to their high solar to electric power conversion efficiency(PCE). The hole transporting material(HTM) is an essential component in perovskite solar cells(PSCs) for efficient charge extraction and transport. NiOx is a potential candidate owing to its wide bandgap and good stability. Materials with low crystal symmetry often exhibit anisotropic properties, allowing the tuning of their physical and chemical properties via crystallographic orientation and exposed facet control. Herein, for the first time we have demonstrated that NiOx with a [111] growth orientation and exposed(111) facets exhibits excellent charge transport properties. The NiOx film is fabricated using RF sputtering technique. We use [111]-oriented NiOx as hole transport layer in perovskite solar cells with a configuration of ITO/NiOx/CHNHPbI/ZnO/Ag. The orientation of the NiOx film influences the arrangement, coordination, surface energy and structural defect of surface atoms and their band structure. As a result, the NiOx film with a [111] crystal orientation not only increase electrical conductivity, carrier mobility and charge extraction ability in the hole transport layer, but also improve morphology of the perovskite film, which contribute to an improvement of PCE and negligible hysteresis. Therefore, the crystal orientation engineering effectively modulates the carrier transporting behavior, which eventually gives rise to the enhanced performance of PSCs.

关键词： crystal orientation engineering NiOx hole transport layer perovskite solar cells

Deciphering Phase Transformation Induced by Ammonium Iodide in Perovskite Film Growth

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Deciphering Phase Transformation Induced by Ammonium Iodide ...

第六届新型太阳能电池材料科学与技术学术研讨会

作者： haonan si Zhuo Kang Wenqiang Fan Ammarah Kausar Abdul Sattar Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing

The past few years have witnessed the extraordinarily rapid development of a class of photovoltaic devices based on organometal halide perovskites. Nevertheless, so far such new-fangled materials still contain performance-limiting defects leading to a bad performance. Herein, we introduce a novel NHPbI-based intermediate phase in crystallization growth process. To control the nucleation and crystal growth process, NHI additive is used to prepare perovskite films of high crystalline quality. A uniform and smooth perovskite film with reduced density of defects and long photoluminescence lifetime is obtained. The maximum power conversion efficiency of perovskite solar cells(PSCs) fabricated by this highly efficient film is up to 17%. The discovery of the innovative intermediate phase is probable to open a new sight to control crystallization of perovskite film and improve performance of PSCs.

关键词： phase transformation ammonium iodide perovskite solar cells

Sulfur-donor Lewis Base Enabled Interaction Tuning with PbI2 Molecule for Modulation of Perovskite Crystallization

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Sulfur-donor Lewis Base Enabled Interaction Tuning with PbI2...

第六届新型太阳能电池材料科学与技术学术研讨会

作者： Chenzhe Xu haonan si Zhuo Kang Shuangfei Ma Zhaozhao Xiong Yunqi Zhao Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing

In the past several years, organic-inorganic halide perovskite solar cells have attained tremendous development and achieved certified power conversion efficiency as high as 23.3%.As the core component of the whole device, high-quality perovskite films with few defects are vital for attaining high performance solar ***, unexpected perovskite films with pinholes are formed because of the lack of precise control over the crystal crystallization ***, we demonstrate an efficient method for modulating the perovskite crystallization through the introduction of thioacetamide(TAA). Compared with pristine perovskite films, TAA-treated perovskite films show enlarged grain size, improved crystal quality, prolonged carrier lifetime and reduced defect density. Moreover, the retarded phase transformation during perovskite film formation process has been investigated. In addition, we ascribe the regulation effect of perovskite crystallization to the interaction between small Lewis Base molecules and PbI molecules, which is revealed by Fourier transform infrared(FTIR) spectra and density function theory(DFT) calculation. As a result, the TAA-incorporated devices based on MAPbI and Cs(FAMA)0.95b(IBr) absorber achieve champion efficiencies of 19.43% and 20.30% under standard AM 1.5 G reporting conditions, respectively. This work offers an effective way to fabricate high quality perovskite films by control of perovskite crystallization via the utilization of Lewis base.

关键词： Perovskite film Lewis Base Thioacetamide Crystal crystallization process

ZnO纳米结构及其在钙钛矿光伏电池中的应用

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科学通报 2020年第25期65卷 2721-2739页

作者：司浩楠张铮廖庆亮康卓张跃北京科技大学材料基因工程高精尖创新中心北京市先进能源材料与技术重点实验室北京100083 北京科技大学新金属材料国家重点实验室材料科学与工程学院北京100083

近年来,有机-无机杂化钙钛矿光伏电池取得了突飞猛进的发展,已成为光伏领域的研究焦点;其光伏性能的不断提高不仅与钙钛矿材料自身质量与光电特性的提升有关,同时依赖于载流子传输层的优化与设计.鉴于ZnO的优势和特性,本文聚焦于ZnO纳... 详细信息

近年来,有机-无机杂化钙钛矿光伏电池取得了突飞猛进的发展,已成为光伏领域的研究焦点;其光伏性能的不断提高不仅与钙钛矿材料自身质量与光电特性的提升有关,同时依赖于载流子传输层的优化与设计.鉴于ZnO的优势和特性,本文聚焦于ZnO纳米结构设计及其在钙钛矿光伏电池中的应用,简述了ZnO材料独特的光电性质,总结了ZnO纳米结构的制备方法及合成原理;详细综述了不同维度ZnO纳米结构在钙钛矿光伏电池中的发展进程,着重阐述了化学掺杂、表面修饰、应力调控策略在ZnO基钙钛矿光伏电池性能优化方面的研究进展.本文系统总结了ZnO电子传输层的国内外研究现状、应用前景及发展趋势,为设计构筑高性能ZnO基钙钛矿光伏电池提供了重要的指导.

关键词： ZnO纳米结构钙钛矿光伏电池电子输运界面工程

Kelvin probe force microscopy for perovskite solar cells

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Science China Materials 2019年第6期62卷 776-789页

作者： Zhuo Kang haonan si Mingyue Shi Chenzhe Xu Wenqiang Fan Shuangfei Ma Ammarah Kausar Qingliang Liao Zheng Zhang Yue Zhang State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology Beijing Beijing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing

Kelvin probe force microscopy(KPFM) could identify the local work function of surface at nanoscale with high-resolution on the basis of simultaneous visualization of surface topography, which provides a unique route to in-situ study of the surface information like the composition and electronic states. Currently, as a non-destructive detection protocol, KPFM demonstrates the unique potential to probe the basic nature of perovskite materials that is extremely sensitive to water, oxygen and electron beam irradiation. This paper systematically introduces the fundamentals and working mode of KPFM, and elaborates the promising applications in perovskite solar cells for energy band structures and carrier transport dynamics, trap states, crystal phases, as well as ion migration explorations. The comprehensive understanding of such potential detection engineering may provide novel and effective approaches for unraveling the unique properties of perovskite solar cells.

关键词： Kelvin probe force microscopy perovskite solar cells carrier transport dynamics trap states ion migration

远程联合打击下防空火力单元机动路线预测研究

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系统工程与电子技术 2024年第7期46卷 2413-2423页

作者：吴浩南狄凌松司守奎万兵苏析超海军航空大学航空基础学院山东烟台264001 海军航空大学岸防兵学院山东烟台264001 海军航空大学航空作战勤务学院山东烟台264001

红蓝双方演习进攻作战中,为全面夺取战场制空权,通常将蓝方防空火力单元作为首波重点打击目标,因此如何准确预测蓝方防空火力单元活动规律,科学设计联合侦察打击行动具有重要意义。首先,系统分析防空火力单元所采用的机动保障模式,结合... 详细信息

红蓝双方演习进攻作战中,为全面夺取战场制空权,通常将蓝方防空火力单元作为首波重点打击目标,因此如何准确预测蓝方防空火力单元活动规律,科学设计联合侦察打击行动具有重要意义。首先,系统分析防空火力单元所采用的机动保障模式,结合防御能力定义给出防御能力计算公式并引入栅格网络模型完成定量计算,基于保障范围约束、阵地资源约束以及机动流程约束,面向实际保障需求,以最短机动路线和最高防御能力为优化目标,建立了适用于地面防空火力单元机动路线的预测模型。其次,针对所构建的非线性模型求解难题,提出了模型线性化转换和求解方法。然后,在最优转移路线的基础上,设计了一种构建机动路线库的算法,从而生成蓝方机动路线的概率预测方案,解析蓝方防空火力单元的机动规律。最后,基于案例仿真,验证了所设计模型和方法的可行性和全局高效性,可实现对蓝方防空火力单元机动路线的有效预测。

关键词：多目标规划最短路线线性化处理防空火力机动路线预测

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Clinicopathologic characteristics of pulmonary ground glass opacity located preoperatively using a Hook-wire guidewire

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Journal of Interventional Medicine 2020年第2期3卷 89-92页

作者： haonan Zhang Tongguo si Zhi Guo Tianjin Medical University Cancer Institute and Hospital National Clinical Research Center of CancerKey Laboratory of Cancer Prevention and Therapy of TianjinTianjin’s Clinical Research Center for Cancer300060China

Objective:To evaluate the relationship between the clinical and imaging features of ground glass opacity(GGO)localized using a preoperative Hook-wire guidewire and postoperative ***:Preoperative Hook-wire guidewire localization was performed in 83 patients with GGO less than 2 cm,and their clinical data,imaging data,and postoperative pathology findings were retrospectively *** images were classified as pure GGO(pGGO) or mixed GGO(mGGO).The relationship between clinical and imaging features and postoperative pathology was ***:The 83 cases were colocalized,and the success rate of the guidewire positioning was 100%.Complications included pneumothorax(19.2% [16/83]) and the incidence of minor bleeding(30.2 [25/83]).Forty-seven patients had mGGO and 36 had *** the 47 cases of mGGO,18(38.3%) were invasive adenocarcinoma(IAC),18(38.3%) were microinvasive adenocarcinoma(MIA),8(17.0%) were adenocarcinoma in situ(AIS),2(4.3%) were atypical adenomatous hyperplasia(AAH),and 1(2.1%) was *** the 36 cases of pGGO,6(16.7%) were IAC,13(36.1%) were MIA,8(22.2%) were AIS,2(5.6%) were AAH,and 7(19.4%) cases were benign lesions.A significantly higher proportion of patients with IAC had mGGO than pGGO(21.7% vs.7.2%,respectively;p=0.004).Among patients with mGGO,a higher proportion of them had a nodule diameter of ≥1 cm than those with a diameter of significant difference in age,location distribution,or pathological ***: Preoperative CT-guided Hook-wire guidewire positioning was safe with minor complications.A significantly higher proportion of patients with IAC had mGGO than *** with mGGO and a nodule diameter ≥1 cm require active treatment.

关键词： CT guidance Hook-wire localization Ground glass opacity Imaging Pathology

Discovery of a new nontoxic cuprate superconducting system Ga-Ba-Ca-Cu-O

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Science China(Physics,Mechanics & Astronomy) 2018年第9期61卷 82-85页

作者： Yue Zhang Wenhao Liu Jin si Xiyu Zhu Chengping He haonan Zhao Hai-Hu Wen Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of PhysicsNational Collaborative Innovation Center of Advanced Microstructures Nanjing University

Superconductivity is observed in a new nontoxic cuprate system Ga-Ba-Ca-Cu-O,with T_c=82 K for Ga Ba_2Ca_5Cu_6O_(14+δ)(Ga-1256)and T_c=116 K probably for Ga Ba_2Ca_3Cu_4O_(10+δ)(Ga-1234)or Ga Ba_2Ca_2Cu_3O_(8+δ)(Ga-1223),*** compounds are fabricated by solid state reaction method under high pressure and high *** are characterized by resistivity,magnetization and X-ray diffraction(XRD)*** temperature dependence of magnetization measured in both zero-field-cooled and field-cooled processes on one sample(S1)shows two superconducting transitions at about 82 K and113 *** estimated shielding fraction for the phase with T_cof 82 K is about 67%,while the fraction for another phase with T_(c )of 113 K is quite *** XRD Rietveld refinement for S1 indicates two main phases existing in the sample,Ga-1256 with fraction of about 58%and non-superconducting Ca_(0.85)Cu O_2with fraction of about 42%***,we can conclude the superconducting phase with transition temperature of 82 K is due to *** resistivity measurement also confirms the superconductivity for S1,and the resistivity reaches zero at about 82 *** temperature dependence of magnetization for another sample(S2)shows much higher superconducting shielding fraction for the phase with T_cof 116 K,which may be a promising prospective for the synthesis of Ga-1234 or Ga-1223 phase.

关键词： cuprates high pressure and high temperature superconductivity