Solar Energy Materials and Solar Cells最新文献

{"title":"Spatially resolved modulus measurements of photovoltaic encapsulation materials using cross-sectional nano-indentation","authors":"Stefan Mitterhofer ,&nbsp;Soshana Smith ,&nbsp;Ashlee Aiello ,&nbsp;Karissa Jensen ,&nbsp;Stephanie Moffitt ,&nbsp;Xiaohong Gu","doi":"10.1016/j.solmat.2025.113749","DOIUrl":"10.1016/j.solmat.2025.113749","url":null,"abstract":"<div><div>Spatially resolved measurement methods are required to investigate the mechanical properties of polymeric packaging materials in photovoltaic modules due to their multilayered structure and possible heterogeneous degradation during their service life. This work presents a comprehensive evaluation of cross-sectional nano-indentation via the continuous stiffness method and its application to three different transparent backsheets and an encapsulant before and after accelerated aging. It lays out the unique challenges for sample preparation, measurement methodology, and data evaluation posed by these two types of samples, as well as possible limitations stemming from their structure and properties. The main issue for backsheets is the structural compliance close to material interfaces, visible in the measured Young’s modulus as a function of indentation depth. However, the method yields reliable results in the bulk of the materials with a thickness as low as 25 μm, with high spatial resolution stemming from the use of a sharp sphero-conical diamond tip. Localized modulus increases can be measured in different layers, corresponding to embrittlement, cracking, and increased fluorescence. The most significant issues for measuring the encapsulant stem from its comparably much lower modulus. We apply a multi-step approach for sample preparation and use a much larger conical flat-head diamond tip. The measured modulus of the encapsulant decreases after ultraviolet exposure in coupons with one type of backsheet, emphasizing the importance of backsheet stability for the durability of the entire module. These results show that the methodology is a valuable tool for characterizing polymers in PV applications.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113749"},"PeriodicalIF":6.3,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diagnosis of faults in photovoltaic modules via full-bias EIS scanning and dynamic parameter analysis","authors":"Ming Liu ,&nbsp;Lei Wang ,&nbsp;Xinyue Cao ,&nbsp;Wenbin Zhang ,&nbsp;Yankai Yang ,&nbsp;Yifan Yan ,&nbsp;Zhen Zhang","doi":"10.1016/j.solmat.2025.113731","DOIUrl":"10.1016/j.solmat.2025.113731","url":null,"abstract":"<div><div>The rapid expansion of photovoltaic (PV) installations has presented significant challenges for operations and maintenance (O&amp;M), particularly in early defect detection and precise fault identification to ensure system reliability. While traditional DC inspection methods detect overall performance changes, they are insufficient for identifying internal or localized defects within modules. This study extends electrochemical impedance spectroscopy (EIS), traditionally applied to individual solar cells, to full-scale PV module analysis. Under controlled conditions, several common defects were simulated, including interconnect ribbon disconnections, cell cracking, potential-induced degradation (PID), and bypass diode short circuits. Impedance parameters were systematically analyzed across a voltage range of 0–31 V. The results reveal that interconnect ribbon disconnections increase series resistance and reduce parallel resistance by altering the ohmic resistance at metal contacts. Cell cracking, irrespective of crack type, significantly reduces the time constant, reflecting higher minority carrier recombination rates. This reduction is particularly important for differentiating between interconnect ribbon disconnections and crack-induced defects. Conversely, PID and bypass diode failures exhibit distinct impedance signatures, enabling clear differentiation from other fault types. These findings highlight the potential of EIS as a powerful diagnostic tool for identifying and distinguishing various fault modes in PV modules.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113731"},"PeriodicalIF":6.3,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bag-pressed plasticine carbon electrodes for perovskite solar cells and modules","authors":"Teng Liao ,&nbsp;Aodong Zhu ,&nbsp;Yuanzhu Jiang ,&nbsp;Wang Zhao ,&nbsp;Mengmeng Cheng ,&nbsp;Junyan Xiao ,&nbsp;Yi-Bing Cheng","doi":"10.1016/j.solmat.2025.113748","DOIUrl":"10.1016/j.solmat.2025.113748","url":null,"abstract":"<div><div>Carbon-based top electrodes have significant value in enhancing the stability and reducing the cost of perovskite solar cells (PSCs). However, the fabrication process for carbon-based top electrodes in large-area, high-performance perovskite solar modules (PSMs) still lacks practical techniques. In this work, we reference the bag moulding process and use a plasticine-like uncured carbon paste to prepare the top electrode for small-area PSCs and PSMs. Benefiting from the uniform pressure provided by the bag pressing process, this carbon electrode can make sufficiently good electrical contact with the hole transport layer in the large-area device in a single pass. After further removing excess fluid, the device can achieve efficiencies of 18.57 % (∼0.15 cm²) and 14.44 % (∼10 cm²) with good stability. This convenient top electrode preparation method at room temperature offers a novel technological solution for the commercial application of large-area PSMs.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113748"},"PeriodicalIF":6.3,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of phosphorus diffusion pre-gettering on the electrical properties of oxygen precipitates in n-type Czochralski silicon for heterojunction solar cells","authors":"Ruokai Wu ,&nbsp;Xiaofeng Li ,&nbsp;Lei Yang ,&nbsp;Xuegong Yu ,&nbsp;Deren Yang","doi":"10.1016/j.solmat.2025.113739","DOIUrl":"10.1016/j.solmat.2025.113739","url":null,"abstract":"<div><div>The pursuit of high-efficiency silicon heterojunction solar cells (SHJ) imposes stringent requirements on the quality of Czochralski silicon (Cz-Si) wafers. Phosphorus diffusion gettering (PDG) has been widely adopted as a standard process to remove metal impurities and improve minority carrier lifetime prior to SHJ fabrication. This study reveals a critical competitive interaction between oxygen-related defects and PDG effectiveness. Specifically, swirl-distributed oxygen precipitate nuclei greatly hinder the effectiveness of PDG, leading to an absolute efficiency loss of 0.4 % compared to the baseline power conversion efficiency (PCE) of about 25.11 % for efficient SHJ solar cells. Electron beam-induced current (EBIC) results imply that the residual iron impurities are located near the oxygen precipitates after a PDG process. Deep-level transient spectroscopy (DLTS) results further identify a deep level (<em>E</em>_c - 0.46 eV) associated with the interface states at the boundary of Fe-decorated oxygen precipitates and silicon matrix. This defect (<em>E</em>_c - 0.46 eV) persists after the PDG, indicating the limited effectiveness of PDG in eliminating iron impurities bound to oxygen precipitates. This work provides a deep insight into the competitive gettering mechanism for iron impurities between oxygen-related defects and PDG in n-type Cz-Si, which could be instructive to optimize wafers' quality for efficient SHJ solar cell manufacturing.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113739"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multicolored electrochromic metallopolymers based on triphenylamine-substituted terpyridine coordination with transition metal ions","authors":"Yuqi Wu ,&nbsp;Bing Cong ,&nbsp;Jingjing Yuan ,&nbsp;Danming Chao ,&nbsp;Yunxia Lv ,&nbsp;Xiaogang Zhao ,&nbsp;Hongwei Zhou ,&nbsp;Chunhai Chen","doi":"10.1016/j.solmat.2025.113736","DOIUrl":"10.1016/j.solmat.2025.113736","url":null,"abstract":"<div><div>The design and synthesis of multicolored electrochromic materials are essential for advancing dynamic display technologies and enhancing the functionality of smart materials in various applications. Here, we have developed a series of triphenylamine-substituted terpyridine coordination metallopolymer (CMP) films through one-step electrochemical polymerization, utilizing six different transition metal ions: Fe²⁺, Ru²⁺, Zn²⁺, Co²⁺, Pd²⁺, and Ni²⁺. These metal ions serve as redox centers, combined with triphenylamine, to produce CMP films exhibiting exceptional color change performance (ΔT: 59.8 % at 700 nm for p-FeL₂) as well as high coloration efficiency (307.8 cm² C⁻¹ for p-FeL₂). The electrochromic properties of the six metal-coordinated polymer films were systematically compared, providing a comprehensive analysis of the structure-electrochromic property relationship driven by the varying metal-to-ligand charge transfer effects associated with different metal ions. Additionally, we integrated the CMP films with V₂O₅ to create a hybrid electrochromic device, which demonstrated reversible color changes. These results highlight the potential of CMP films for developing multicolor displays and advancing electrochromic technologies.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113736"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-temperature thermal stability and thermal conductivity of Al/AlN-C core-shell microencapsulated phase change material","authors":"Jing Chen ,&nbsp;Zhenhua Gu ,&nbsp;Yu Chen ,&nbsp;Zhiqiang Li ,&nbsp;Yali Liu ,&nbsp;Liangnuo Yang ,&nbsp;Zheng Zhou ,&nbsp;Yunfeng Wang ,&nbsp;Qiongfen Yu ,&nbsp;Ming Li","doi":"10.1016/j.solmat.2025.113745","DOIUrl":"10.1016/j.solmat.2025.113745","url":null,"abstract":"<div><div>Core-shell phase change materials with high thermal storage and thermal conductivity have attracted significant attention in the development of solar thermal utilization technology. The selection and construction of shell materials are crucial for ensuring their excellent performance. In this study, Al/AlN-C composite shell microencapsulated phase change materials (MEPCMs) were prepared using metal Al as the phase change material, supplemented with melamine as a nitrogen and carbon source through low-temperature nitriding. During the reaction process, the melamine was pyrolyzed at different temperature stages to produce ammonia, carbon, and carbon-nitrogen compounds. Pyrolyzed ammonia facilitated the formation of an AlN shell while carbon and carbon-nitrogen compounds coated the surface of the core material to form an AlN-C composite shell. The Al@AlN-C exhibited excellent thermal energy storage capacity (293.68 J g⁻¹) when prepared at 800 °C. After 100 melting-freezing cycles, the latent heat value of microcapsules decreases only 5.40 %, reaching 277.80 J g⁻¹, indicating excellent thermal cycle stability. In addition, the microcapsules possess high thermal conductivity (25 °C, 7.45 W/(m·k)), showcasing their significant potential for utilization in high-temperature heat storage systems.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113745"},"PeriodicalIF":6.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-cost carbazole and phenothiazine based trimer molecules as hole transporting materials for inverted perovskite solar cells","authors":"Valentina Maruzzo ,&nbsp;Antoine Bousquet ,&nbsp;Fabio Matteocci ,&nbsp;Elisa Nonni ,&nbsp;Daimiota Takhellambam ,&nbsp;Raffaele Borrelli ,&nbsp;Damiano Mangatia ,&nbsp;Eric Grelet ,&nbsp;Mamatimin Abbas ,&nbsp;Mathieu G. Silly ,&nbsp;Matteo Bonomo ,&nbsp;Aldo Di Carlo ,&nbsp;Claudia Barolo ,&nbsp;Nadia Barbero ,&nbsp;Christine Lartigau-Dagron","doi":"10.1016/j.solmat.2025.113697","DOIUrl":"10.1016/j.solmat.2025.113697","url":null,"abstract":"<div><div>Phenothiazine (P) and Carbazole (C) are low-cost scaffolds widely used in the synthesis of Hole Transporting Materials (HTMs) for Perovskite Solar Cells (PSCs). So far, these compounds have been assembled together forming HTMs applied exclusively in direct cell architectures with the necessity of dopants to improve power conversion efficiencies (PCEs). In this work, two trimer molecules with opposite structure, namely CPC and PCP, have been designed, synthesized and implemented without any dopant in inverted PSCs. We assessed the impact of the molecular design on the final device performances, in view of the different intrinsic features. Both HTMs optoelectronic properties have been investigated along with a computational study by DFT. For optimizing the implementation in PSCs, thermal annealings and decrease of HTM concentration have been considered. PCP outperformed CPC, with an average PCE of 14.1 % against 10.4 %, achieving comparable performances to PTAA reference device (14.5 %). No hysteresis was observed for all devices and high FF reaching almost 80 % were obtained with PCP-based devices. The performances of the HTMs were correlated with the electronic behaviour observed by synchrotron-based soft X-ray photoelectron spectroscopy (PES). Secondary electron cut-off analysis highlighted a favourable work-function modification and the presence of high intermolecular interaction along with better energetic alignment for PCP, which contributed to its enhanced performances. Complementary characterizations by transient photocurrent and transient photovoltage confirmed the positive effect of decreasing the HTM concentration as observed in devices. Steady state and time resolved photoluminescence experiments corroborated the improved charge carrier dynamics and recombination features for PCP.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113697"},"PeriodicalIF":6.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144116869","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic engineering of back interface and bulk defects via Mo:Na layer incorporation for efficient directly sputtered Cu(In,Ga)Se2 solar cells","authors":"Zeran Gao,&nbsp;Zihan Guo,&nbsp;Qinxue Pang,&nbsp;Shanshan Tian,&nbsp;Yuchen Xiong,&nbsp;Wanlei Dai,&nbsp;Yali Sun,&nbsp;Chao Gao,&nbsp;Qing Zhou,&nbsp;Ridong Cong,&nbsp;Xinzhan Wang,&nbsp;Wei Yu","doi":"10.1016/j.solmat.2025.113728","DOIUrl":"10.1016/j.solmat.2025.113728","url":null,"abstract":"<div><div>Cu(In,Ga)Se₂ (CIGS) thin-film solar cells fabricated via direct sputtering of a single quaternary CIGS target face challenges in back-contact engineering, particularly MoSe₂ formation under Se-deficient conditions, which distributes high-density detrimental bulk defects. Herein, interface band alignment and defect control for a high-quality quaternary-sputtered CIGS solar cell is reported by introducing a Mo:Na layer on the back electrode. By depositing a Mo:Na layer prior to Mo sputtering, we achieve controlled Na incorporation, suppressing deep defects while facilitating MoSe₂ crystallization. XPS and UPS analyses reveal that Na-induced surface Cu depletion enhances the preferential (112) oriented grain growth, and the formed MoSe₂ produces a favorable energy band structure at the Mo/CIGS interface. In addition, Na segregation on the absorber surface promotes lateral grain growth, facilitating the growth of the uniform CdS thin films. Combining the results of experiment and SCAPS simulation, the insertion of the Mo:Na layer simultaneously engineers back interface and bulk absorber, the power conversion efficiency of CIGS solar cells increases from 10.17 % to 13.38 %. This work emphasizes the effect of Mo:Na layer in tailoring grain growth, defect level and band arrangement, which paves a convenient and efficient way to realize high performance sputtered solar cells and photovoltaic devices.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113728"},"PeriodicalIF":6.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perovskite solar module-thermoelectric generator tandem system with high power output","authors":"Lianjian Mo ,&nbsp;Yanxin Hu ,&nbsp;Tingting Wu ,&nbsp;Guangli Liu ,&nbsp;Changxiang Fan ,&nbsp;Mengjie Song","doi":"10.1016/j.solmat.2025.113737","DOIUrl":"10.1016/j.solmat.2025.113737","url":null,"abstract":"<div><div>Combining perovskite solar cells (PSC) with thermoelectric generators (TEG) in a tandem system enables the utilisation of the full spectrum of sunlight, and is an effective way to reduce the operating temperature of PSC and increase the photovoltaic conversion efficiency (PCE). However, the current research on PSC in tandem with TEG is still limited to the laboratory scale size stage, which is unable to generate enough power to meet the demand of practical applications. In this regard, the electrical performance test system of the PSM-TEG tandem system was built by coupling the large-area perovskite solar module (PSM) and TEG, and the photothermal and photoelectric characteristics were studied under low concentrating light. The experimental results showed that the PCE of PSM-TEG was increased at all irradiation intensities, with a more pronounced effect observed at higher concentration ratios. Additionally, the feasibility of the PSM coupled with two thermoelectric generators (2TEGs) under high irradiance conditions was validated, showing a significant increase in the power output of the TEG. Furthermore, the results indicated that the perovskite solar module-thermoelectric generator-water-cooling tandem system (PSM-TEG-Water) achieved higher photoconversion efficiency and power output, measuring 12.68 % and 0.3 W, respectively. Notably, the temperature difference between the hot and cold sides of the TEG in the PSM-TEG-Water tandem system was greater and more stable than that of the PSM-TEG tandem system, which facilitated improved power collection and utilisation, contributed to more stable operation, and extended the lifespan of the device.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113737"},"PeriodicalIF":6.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion mechanism of NiCrMoNb model alloy and NiCoFeCrMoNb high entropy alloy in molten solar salt at 600 °C","authors":"Huayi Lu ,&nbsp;Yufei Cheng ,&nbsp;Ruoyu Li ,&nbsp;Minghui Yu ,&nbsp;Yanli Wang ,&nbsp;Chaoliu Zeng ,&nbsp;Xiangwei Li ,&nbsp;Wangyan Lv","doi":"10.1016/j.solmat.2025.113725","DOIUrl":"10.1016/j.solmat.2025.113725","url":null,"abstract":"<div><div>Present work aims to explore alloy optimization with better resistance to molten nitrates by firstly designing the as-cast 63Ni-22Cr-10Mo-5Nb model alloy referring to the main components of Inconel 625 alloy with good corrosion resistance and then substituting 40 wt% Ni in the model alloy with 20 wt% Fe and 20 wt% Co to obtain a 23Ni-20Fe-20Co-22Cr-10Mo-5Nb high entropy alloy. Results show that the formation of corrosion products dominated by Co-spinel structures is crucial for the corrosion resistance of the NiCoFeCrMoNb high-entropy alloy. Moreover, the main corrosion product NiO for NiCrMoNb model alloy experiences alkaline dissolution, resulting in the declining corrosion resistance.</div></div>","PeriodicalId":429,"journal":{"name":"Solar Energy Materials and Solar Cells","volume":"290 ","pages":"Article 113725"},"PeriodicalIF":6.3,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144105525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}