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Recent advances in Pb-Sn mixed perovskite solar cells 被引量:2
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作者 Yanyu Deng Guanhua Ren +4 位作者 Danao Han Wenbin Han Zhuowei Li Chunyu Liu Wenbin Guo 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第10期615-638,I0015,共25页
Organic-inorganic hybrid lead-tin perovskite solar cells(Pb-Sn PSCs)have attracted much attention because of their advantages of low toxicity,variable bandgap,and feasibility for all-perovskite tandem solar cells,and ... Organic-inorganic hybrid lead-tin perovskite solar cells(Pb-Sn PSCs)have attracted much attention because of their advantages of low toxicity,variable bandgap,and feasibility for all-perovskite tandem solar cells,and the current power conversion efficiency(PCE)has exceeded 23%.However,due to the rambunctious crystallization process,easily oxidized Sn(Ⅱ)and inadequate energy level arrangement,there are many defects in perovskite films resulting in serious carrier recombination,which makes PCE still lag Pb-based PSCs.The quality of perovskite films is an important factor affecting the overall device performance.The selection and optimization of transport layers not only determines the interface energy level arrangement but also affects the carrier transport.In this paper,the research progress in improving performance of Pb-Sn PSCs in recent years is reviewed from aspects of perovskite layer and transport layers.The profound understanding of different promotion methods is summarized as well.These results have certain guiding significance for the future development and commercial application of Pb-Sn PSCs. 展开更多
关键词 Pb-Sn mixed perovskite solar cells CRYSTALLINITY Charge transport layer PASSIVATION Additive
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A mixed-cation lead iodide MA_(1-x)EA_xPbI_3 absorber for perovskite solar cells
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作者 Yong Wang Taiyang Zhang +5 位作者 Ge Li Feng Xu Tian Wang Yihui Li Yang Yang Yixin Zhao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2018年第1期215-218,共4页
The mixed-cation lead halide perovskites have emerged as a new class of promising light harvesting materials for solar cells. The formamidinium(FA), methylammonium(MA) and Cs cations are widely studied in the fiel... The mixed-cation lead halide perovskites have emerged as a new class of promising light harvesting materials for solar cells. The formamidinium(FA), methylammonium(MA) and Cs cations are widely studied in the field of mixed-cation perovskites. Here, we have investigated ethylammonium(EA) as an alternative cation to fabricate a mixed-cation perovskite of MA_(1-x)EA_xPbI_3. We have characterized the materials using the X-ray diffraction(XRD), scanning electron microscope(SEM), and UV–vis spectrum. Our results have confirmed the successful incorporation of EA cations into MAPbI_3. Interestingly, the optimal amount of EA to achieve the best performance is quite low. This is different from the FA–MA mixed-cation perovskites although EA and FA have similar radii. In short, the EA–MA mixed-cation perovskite has some material and device properties highly distinguishable from the FA–MA one. 展开更多
关键词 mixed cation Ethylammonium MA1-xEAxPbl3 Perovskite solar cell
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Mediating Mesenchymal Stem Cells Responses and Osteopontin Adsorption via Oligo(ethylene glycol)-amino Mixed Self-assembled Monolayers
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作者 Lijing Hao Tianjie Li +3 位作者 Naru Zhao Fuzhai Cui Chang Du Yingjun Wang 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2016年第9期966-970,共5页
Oligo(ethylene glycol) (-OEG) and amino (-NH2) mixed self-assembled monolayers (SAMs) were employed as model substrates to investigate the effect of charge density on the fate of mesenchymal stem cells (MSCs... Oligo(ethylene glycol) (-OEG) and amino (-NH2) mixed self-assembled monolayers (SAMs) were employed as model substrates to investigate the effect of charge density on the fate of mesenchymal stem cells (MSCs) and osteopontin (OPN) adsorption. We found that all surfaces presenting -NH2 groups favored cell responses regardless of the surface charge. Meanwhile, OPN adsorption could remain stable on the mixed SAMs over a certain range of charge densities. Our work provides some insights into cell responses and protein adsorption to surface charge. 展开更多
关键词 mixed self-assembled monolayers Oligo(ethylene glycol)-amino Mesenchymal stem cell Osteopontin
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Efficiency of adenoviral vector mediated CTLA4Ig gene delivery into mesenchymal stem cells 被引量:6
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作者 邓宇斌 郭小荑 +1 位作者 原清涛 李树浓 《Chinese Medical Journal》 SCIE CAS CSCD 2003年第11期1649-1654,共6页
Objective To prevent Graft-versus-host disease (GVHD) in rat model, we evaluated the feasibility of mesenchymal stem cells (MSCs) as a gene transfer target and studied the efficiency of recombinant adenovirus mediated... Objective To prevent Graft-versus-host disease (GVHD) in rat model, we evaluated the feasibility of mesenchymal stem cells (MSCs) as a gene transfer target and studied the efficiency of recombinant adenovirus mediated gene therapy.Methods We constructed the recombinant adenovirus containing CTLA4lg gene. Rat MSCs of passages 3-5 were infected by the adenovirus, and the transfection efficiency was monitored by GFP markers. We performed flow cytometric analysis, immunohistochemical and Western blotting analysis to identify the CTLA4lg expression. The gene transferred MSCs were tested for their ability to inhibit the allogeneic lymphocyte response in vitro and to prevent GVHD in a rat model.Results Recombinant adenovirus pAd-CTLA4lg was correctly constructed and confirmed. After MSCs were infected by the adenovirus, the CTLA4lg protein was detected not only in transgenic MSCs, but also in the culture medium. In a mixed lymphocytes response (MLR) test, the transgenic MSCs could significantly inhibit the allogeneic lymphocyte response compared with the control groups (P < 0. 05) . A model of GVHD was developed by transplanting bone marrow cells and spleen lymphocytes of F344 rats to lethally irradiated SD rats. The onset of GVHD could be ameliorated or prevented by co-administration of transgenic MSCs. All the rats in the control groups suffered severe acute GVHD. CTLA4lg expression was observed in the liver, intestine, kidney and spleen 30 days post- transplantation.Conclusions Our results indicate that adenoviral vectors could efficiently transfer CTLA4lg gene into MSCs and sustain long-term stable expression in vitro and in vivo. 展开更多
关键词 CTLA4Ig · adenoviral vector · mesenchymal stem cells · mixed lymphocytes response
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Collective migrations in an epithelial-cancerous cell monolayer
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作者 Jian‑Qing Lv Peng‑Cheng Chen +3 位作者 Liu‑Yuan Guan Wojciech T.Góźdź Xi‑Qiao Feng Bo Li 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2021年第5期773-784,I0001,共13页
Collective cell migration is extensively observed in embryo development and cancer invasion.During these processes,the interactions between cells with distinct identities and fates are of importance for boundary forma... Collective cell migration is extensively observed in embryo development and cancer invasion.During these processes,the interactions between cells with distinct identities and fates are of importance for boundary formation and host defense against cancer.In this paper,we explore the collective dynamics of a two-dimensional cell mixing monolayer consisting of non-tumorigenic mammary epithelial cells and breast cancer cells.We show that the epithelial-cancerous cell mixing system displays unique sorting behaviors.The epithelial cells aggregate to form scattered clusters,which perform random motion with simultaneous translation and rotation,strikingly distinct from the classical persistent random walk of individual migratory cells.The motility of cancer cells is markedly promoted by the epithelial clusters,exhibiting remarkable contact enhancement of locomotion.A discrete model based on the Johnson-Kendall-Roberts contact mechanics is proposed to identify the influence of intercellular interactions,active migration forces and cell-substrate friction forces on the collective cell dynamics.These findings could advance our understanding of many biological processes,such as cancer metastasis and tissue morphogenesis. 展开更多
关键词 Collective cells cell mixing Dynamics cell-cell interaction
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Development of minimum tie line length method for determination of minimum miscible pressure in gas injection process
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作者 Ehsan Zareie shirazani Taraneh Jafari Behbahani 《Petroleum Research》 2019年第2期173-180,共8页
Gas injection process is a very important technology in enhanced oil recovery.Minimum miscible pressure is one of the key parameters in gas injection processes.Various experimental methods such as slim tube are used t... Gas injection process is a very important technology in enhanced oil recovery.Minimum miscible pressure is one of the key parameters in gas injection processes.Various experimental methods such as slim tube are used to measure MMP.These methods are costly and time consuming.Recently computational methods are used in order to achieve a cost-effective and reliable technique to evaluate MMP.In this work,a new methodology has been proposed for determination of MMP using the minimum tie line length method.A real mixing cell model was developed to estimate the MMP,MME and key tie lines.This method is simple,robust,and faster than conventional one-dimensional simulation of slim tube.The new mixing cells method can accurately determine the whole key tie lines to a shift,regardless of the number of injection gas and reservoir fluid components.Unlike other methods of mixing cells,this method automatically corrects dispersion by additional contacts to achieve the low variation domain of tie line slope.Also,the determination and implementation of the minimum miscibility enrichment are investigated. 展开更多
关键词 Minimum miscible pressure Minimum miscibility enrichment Multiple mixing cells method Enhanced oil recovery Minimum tie line length method
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