This review paper summarizes the recent progress of highly efficient copolymers with the fluorination strategy for photovoltaic applications.We first present a brief introduction of the fundamental principles of polym...This review paper summarizes the recent progress of highly efficient copolymers with the fluorination strategy for photovoltaic applications.We first present a brief introduction of the fundamental principles of polymer solar cells,and then the functions of fluorine atoms on the polymer donor materials.Finally,we review the research progress of the reported copolymers by classification of the fluorinated acceptor units and donor units,respectively.The resulting structure-property correlations of these copolymers are also discussed which shall certainly facilitate widespread utilization of this strategy for constructing high-performance photovoltaic copolymers in the future.展开更多
The commercialization of lithium-sulfur(Li-S)batteries has been hampered by the low utilization of S,resulting in low practical energy density and the severe shuttle effect of lithium polysulfides(LiPSs)that leads to ...The commercialization of lithium-sulfur(Li-S)batteries has been hampered by the low utilization of S,resulting in low practical energy density and the severe shuttle effect of lithium polysulfides(LiPSs)that leads to poor cycle life.Herein,a combined strategy of electrolyte engineering and separator functionalization was proposed to solve the conflict between high S utilization and cycling life.We have demonstrated that the high donor electrolyte regulates the solvation of LiPSs with the formation of S_(3)^(·-)to induce radical-assisted efficient conversion pathway and threedimensional(3D)Li2S deposition,which greatly enhanced the S utilization while exacerbating the shuttling of LiPSs.Fortunately,the carbon nanosheet-based modified separator with abundant Zn-Co diatomic metal sites efficiently inhibited the shuttling of LiPSs by catalyzing the conversion reaction of LiPSs.Hence,the resulting Li-S battery delivered a remarkably high capacity of 1300 mAh g^(-1) with a high average coulombic efficiency of 99.4% during cycling.Even at a high S mass loading(9.3 mg cm^(-2))and lean electrolyte condition(E/S=3μL mg^(-1)),the Li-S battery still delivered a high capacity of 1088 mAh g^(-1),representing a significant advancement in designing practically high energy Li-S batteries with long cycle life.展开更多
High specific power or power to mass ratio is a critical concern of photovoltaic(PV)for aerospace applications.Organic solar cells(OSCs)have advantages such as high absorption coefficient,compatibility with flexible s...High specific power or power to mass ratio is a critical concern of photovoltaic(PV)for aerospace applications.Organic solar cells(OSCs)have advantages such as high absorption coefficient,compatibility with flexible substrate,light-weight,etc.Moreover,recently OSCs achieved power conversion efficiency(PCE)over 20%with the incorporation of the non-fullerene based small molecule acceptor and high specific power is believed to be obtained.To enter the market,high-altitude platform station(HAPS)is perhaps the first place to start with.In this work,we explore and compare the in-situ performance of two high performing OSCs,using the same donor but different acceptors,in mimic HAPS environment where the pressure,temperature and the illumination conditions are controlled.We found that the use of acceptor can result in substantial difference in the performance at low temperatures.展开更多
In view of few attention on star-shaped molecules containing triphenylamine(TPA)unit asπ-linker,a series of small four-armed molecules,consisting of octyloxy-substituted 2,1,3-benzothiadiazole(DOBT)or 4-octyl-2-thien...In view of few attention on star-shaped molecules containing triphenylamine(TPA)unit asπ-linker,a series of small four-armed molecules,consisting of octyloxy-substituted 2,1,3-benzothiadiazole(DOBT)or 4-octyl-2-thienyl functionalized DOBT as the core,TPA asπ-bridge and 4-methylphenyl or 4-methoxyphenyl groups as terminal units,was designed and synthesized.The effects ofπbridges and substitute groups on molecular photoe-lectric performance and photovoltaic performance were fully explored.With the help of the additional thiophene-linkers incorporation,3-octylthienyl substituted molecule with end-capping 4-methylphenyl(T-BTTPAM)and 3-octylthienyl substituted molecule with end-capping 4-methoxyphenyl(T-BTTPAOM)showed stronger and broader absorption,as well as higher charge mobilities compared to the molecules without thiophene-linkers(BTTPAM and BTTPAOM).Additionally,changing substitute groups from methyl to methoxy helped BTTPAOM and T-BTTPAOM achieve better absorption properties than BTTPAM and T-BTTPAM,respectively.When paired with PC61BM as the electron acceptor to fabricate solution-processed photovoltaic devices,the four materials gave high open-circuit voltage(Voc)values over 0.90 V.These results demonstrate that our materials are promising candidates as donor materials for organic solar cells(OSCs),and further device optimization is in progress in our laboratory.展开更多
We report fabrication and characterization of organic heterojunction UV detectors based on N,N＇-bis（naphthalen- 1-y1）-N,N＇-bis （phenyl） benzidine （NPB） and fullerene C60. The effects of different thicknesses o...We report fabrication and characterization of organic heterojunction UV detectors based on N,N＇-bis（naphthalen- 1-y1）-N,N＇-bis （phenyl） benzidine （NPB） and fullerene C60. The effects of different thicknesses of NPB and C60 layers are studied and compared. Notably, the optimal thicknesses of electron acceptor C60 and electron donor NPB are 40 nm and 80 nm, respectively. The J V characteristic curves of the device demonstrate a three-order- of-magnitude difference when illuminated under a 350nm UV light and in the dark at -0.5 V. The device exhibits high sensitivity in the region of 320-380nm with the peak located around 35Onm. Especially, it shows excellent photo-response characteristic with a responsivity as high as 315 mA/W under the illumination of 192μW.cm 2 350nm UV light at -5 V. These results indicate that the NPB/C60 heterojunction structure device might be used as low-cost low-voltage UV photodetectors.展开更多
In order to compare the effect between haploidentical(HID) stem cell transplantation(HSCT) and matched sibling donor(MSD)stem cell transplantation for high-risk acute myeloid leukemia(AML) in first complete remission ...In order to compare the effect between haploidentical(HID) stem cell transplantation(HSCT) and matched sibling donor(MSD)stem cell transplantation for high-risk acute myeloid leukemia(AML) in first complete remission status(CR1), we retrospectively studied 170 cases who received stem cell transplantation from Jan 2008 to Jul 2015 in Peking University People's Hospital. We divided all cases into MSD group(43 cases) and HID(127 cases) group. Patients in HID and MSD group displayed similar baseline characteristics except for age distribution. There were no statistic differences for overall survival(OS), cumulative incidence of relapse, leukemia free survival(LFS), transplantation related mortality(TRM) between HID and MSD group. The 3-year OS, LFS for all patients was 63.9% and 59.7% respectively. Multivariate analysis showed that grade III-IV acute graft versus host disease(aGVHD) was an independent risk factor for treatment related mortality(HR=8.134, 95% CI:3.210–20.611, P<0.001), monosomy/complex chromosomal karyotype and white blood cell count more than 50×109 L-1 were two independent factors for relapse(HR=1.533, 95% CI: 1.040–2.260, P=0.031)(HR=1.004, 95% CI: 1.001–1.008, P=0.015).Grade III-IV aGVHD was an independent factor for mortality(HR=3.184, 95% CI: 1.718–5.902, P<0.001). These results demonstrated some risk factors for high-risk AML leukemia transplantation and indicated for AML patients in CR1 status, haplo stem cell transplantation could have the same therapeutic effect as MSD transplantation.展开更多
以番茄品种辽园多丽为试验材料,研究适当遮光对番茄越夏栽培过程中常遭遇的高温强光(HH, high temperature and highlight)对叶片光系统Ⅱ及光合机构恢复能力的影响。结果表明:HH和HH下适当遮光(HL, HH with proper shading)均导致番茄...以番茄品种辽园多丽为试验材料,研究适当遮光对番茄越夏栽培过程中常遭遇的高温强光(HH, high temperature and highlight)对叶片光系统Ⅱ及光合机构恢复能力的影响。结果表明:HH和HH下适当遮光(HL, HH with proper shading)均导致番茄幼苗叶片的光合作用效率显著降低,非气孔性限制起主导作用。番茄幼苗叶片PSⅡ反应中心活性降低,PSⅡ电子传递受阻,PsbO和PsbA基因相对表达量降低,即HH和HL对番茄幼苗叶片的主要作用位点为PSⅡ供体侧放氧复合体(OEC)和PSⅡ受体侧QA向QB的传递过程,其原因主要与OEC功能的破坏及D1蛋白的降解有关。HH胁迫下PsbA基因相对表达量降低幅度大于PsbO,并且标准化OJIP曲线上2 ms处相对可变荧光(VJ)的增加幅度大于0.3 ms处相对可变荧光(VK);HL胁迫下PsbA和PsbO基因相对表达量均有降低,但幅度小于HH。说明HH胁迫对番茄幼苗PSⅡ受体侧的伤害程度大于供体侧,HL胁迫下番茄PSⅡ供体侧和受体侧均有损伤,但伤害程度较弱。经12 h恢复后,HH和HL的光合作用能力均有不同程度的提高,适当遮光提高的程度较多,且PSⅡ供体侧和受体侧基本可以恢复到对照水平。此外,HH和HL下番茄幼苗PSⅡ反应中心对光能的捕获及利用能力降低,单位面积有活性反应中心的数量和吸收光能用于电子传递的能量比例均有不同程度的下降,PSⅡ反应中心吸收光能多以热能形式进行耗散。HH和HL经12 h恢复后均有不同程度的增加,HL增加的幅度较明显。因此,在番茄设施越夏栽培的种植和推广时,可以考虑通过遮光网适当遮光的方式缓解高温强光对番茄的产量和品质造成的影响。展开更多
Open-shell oligomers and polymers have exhibited intriguing electronic and magnetic properties, making them highly desirable for a wide range of applications, including ambipolar organic field-effect transistors (OFET...Open-shell oligomers and polymers have exhibited intriguing electronic and magnetic properties, making them highly desirable for a wide range of applications, including ambipolar organic field-effect transistors (OFETs), photodetectors, organic thermoelectrics, and spintronics. Although open-shell ground states have been observed in certain small molecules and doped organic semiconductors, the exploration of open-shell ground-state conjugated polymers is still limited, and the strategies for designing these polymers remain obscure. This review aims to briefly introduce the theory and characterization methods of open-shell conjugated polymers, along with an overview of recent progress and applications. The objective is to stimulate further advancements and investigations in this promising area by shedding light on the potential of open-shell conjugated polymers and the challenges that lie ahead.展开更多
基金supported by the NSFC(Nos.51573107,21432005)the Youth Science and Technology Foundation of Sichuan Province(No.2013JQ0032)+2 种基金the Foundation of State Key Laboratory of Polymer Materials Engineering(Nos.sklpme2014-3-05,sklpme2015-2-01)the Synergistic Innovation Joint Foundation of CAEP-SCU(No.XTCX2014008)the Fundamental Research Funds for the Central Universities(Nos.2012SCU04B01,YJ2011025)
文摘This review paper summarizes the recent progress of highly efficient copolymers with the fluorination strategy for photovoltaic applications.We first present a brief introduction of the fundamental principles of polymer solar cells,and then the functions of fluorine atoms on the polymer donor materials.Finally,we review the research progress of the reported copolymers by classification of the fluorinated acceptor units and donor units,respectively.The resulting structure-property correlations of these copolymers are also discussed which shall certainly facilitate widespread utilization of this strategy for constructing high-performance photovoltaic copolymers in the future.
基金supported by the National Natural Science Foundation of China(grant nos.22208118 and 92372123)the Natural Science Foundation of Guangdong Province,China(grant nos.2024A1515012236,2022B1515020005,and 2023B1515130004).
文摘The commercialization of lithium-sulfur(Li-S)batteries has been hampered by the low utilization of S,resulting in low practical energy density and the severe shuttle effect of lithium polysulfides(LiPSs)that leads to poor cycle life.Herein,a combined strategy of electrolyte engineering and separator functionalization was proposed to solve the conflict between high S utilization and cycling life.We have demonstrated that the high donor electrolyte regulates the solvation of LiPSs with the formation of S_(3)^(·-)to induce radical-assisted efficient conversion pathway and threedimensional(3D)Li2S deposition,which greatly enhanced the S utilization while exacerbating the shuttling of LiPSs.Fortunately,the carbon nanosheet-based modified separator with abundant Zn-Co diatomic metal sites efficiently inhibited the shuttling of LiPSs by catalyzing the conversion reaction of LiPSs.Hence,the resulting Li-S battery delivered a remarkably high capacity of 1300 mAh g^(-1) with a high average coulombic efficiency of 99.4% during cycling.Even at a high S mass loading(9.3 mg cm^(-2))and lean electrolyte condition(E/S=3μL mg^(-1)),the Li-S battery still delivered a high capacity of 1088 mAh g^(-1),representing a significant advancement in designing practically high energy Li-S batteries with long cycle life.
基金the SPECIFIC Innovation and Knowledge Centre(EP/N020863/1)and ATIP(EP/T028513/1)grant for providing financial support.Hin-Lap Yip acknowledges the financial support by the Guangdong Major Project of Basic and Applied Basic Research(No.2019B030302007)the Ministry of Science and Technology of China(No.2019YFA0705900)+1 种基金Guichuan Zhang acknowledges the financial support by the Na-tional Natural Science Foundation of China(No.51903095)the Natural Science Foundation of Guangdong Province(No.2021 A1515010959).
文摘High specific power or power to mass ratio is a critical concern of photovoltaic(PV)for aerospace applications.Organic solar cells(OSCs)have advantages such as high absorption coefficient,compatibility with flexible substrate,light-weight,etc.Moreover,recently OSCs achieved power conversion efficiency(PCE)over 20%with the incorporation of the non-fullerene based small molecule acceptor and high specific power is believed to be obtained.To enter the market,high-altitude platform station(HAPS)is perhaps the first place to start with.In this work,we explore and compare the in-situ performance of two high performing OSCs,using the same donor but different acceptors,in mimic HAPS environment where the pressure,temperature and the illumination conditions are controlled.We found that the use of acceptor can result in substantial difference in the performance at low temperatures.
文摘In view of few attention on star-shaped molecules containing triphenylamine(TPA)unit asπ-linker,a series of small four-armed molecules,consisting of octyloxy-substituted 2,1,3-benzothiadiazole(DOBT)or 4-octyl-2-thienyl functionalized DOBT as the core,TPA asπ-bridge and 4-methylphenyl or 4-methoxyphenyl groups as terminal units,was designed and synthesized.The effects ofπbridges and substitute groups on molecular photoe-lectric performance and photovoltaic performance were fully explored.With the help of the additional thiophene-linkers incorporation,3-octylthienyl substituted molecule with end-capping 4-methylphenyl(T-BTTPAM)and 3-octylthienyl substituted molecule with end-capping 4-methoxyphenyl(T-BTTPAOM)showed stronger and broader absorption,as well as higher charge mobilities compared to the molecules without thiophene-linkers(BTTPAM and BTTPAOM).Additionally,changing substitute groups from methyl to methoxy helped BTTPAOM and T-BTTPAOM achieve better absorption properties than BTTPAM and T-BTTPAM,respectively.When paired with PC61BM as the electron acceptor to fabricate solution-processed photovoltaic devices,the four materials gave high open-circuit voltage(Voc)values over 0.90 V.These results demonstrate that our materials are promising candidates as donor materials for organic solar cells(OSCs),and further device optimization is in progress in our laboratory.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61274068 and 61404058the Project of Science and Technology Development Plan of Jilin Province under Grant Nos 20150204003GX and 20130206021GXthe Project of Science and Technology Plan of Changchun City under Grant No 14KG020
文摘We report fabrication and characterization of organic heterojunction UV detectors based on N,N＇-bis（naphthalen- 1-y1）-N,N＇-bis （phenyl） benzidine （NPB） and fullerene C60. The effects of different thicknesses of NPB and C60 layers are studied and compared. Notably, the optimal thicknesses of electron acceptor C60 and electron donor NPB are 40 nm and 80 nm, respectively. The J V characteristic curves of the device demonstrate a three-order- of-magnitude difference when illuminated under a 350nm UV light and in the dark at -0.5 V. The device exhibits high sensitivity in the region of 320-380nm with the peak located around 35Onm. Especially, it shows excellent photo-response characteristic with a responsivity as high as 315 mA/W under the illumination of 192μW.cm 2 350nm UV light at -5 V. These results indicate that the NPB/C60 heterojunction structure device might be used as low-cost low-voltage UV photodetectors.
文摘In order to compare the effect between haploidentical(HID) stem cell transplantation(HSCT) and matched sibling donor(MSD)stem cell transplantation for high-risk acute myeloid leukemia(AML) in first complete remission status(CR1), we retrospectively studied 170 cases who received stem cell transplantation from Jan 2008 to Jul 2015 in Peking University People's Hospital. We divided all cases into MSD group(43 cases) and HID(127 cases) group. Patients in HID and MSD group displayed similar baseline characteristics except for age distribution. There were no statistic differences for overall survival(OS), cumulative incidence of relapse, leukemia free survival(LFS), transplantation related mortality(TRM) between HID and MSD group. The 3-year OS, LFS for all patients was 63.9% and 59.7% respectively. Multivariate analysis showed that grade III-IV acute graft versus host disease(aGVHD) was an independent risk factor for treatment related mortality(HR=8.134, 95% CI:3.210–20.611, P<0.001), monosomy/complex chromosomal karyotype and white blood cell count more than 50×109 L-1 were two independent factors for relapse(HR=1.533, 95% CI: 1.040–2.260, P=0.031)(HR=1.004, 95% CI: 1.001–1.008, P=0.015).Grade III-IV aGVHD was an independent factor for mortality(HR=3.184, 95% CI: 1.718–5.902, P<0.001). These results demonstrated some risk factors for high-risk AML leukemia transplantation and indicated for AML patients in CR1 status, haplo stem cell transplantation could have the same therapeutic effect as MSD transplantation.
文摘以番茄品种辽园多丽为试验材料,研究适当遮光对番茄越夏栽培过程中常遭遇的高温强光(HH, high temperature and highlight)对叶片光系统Ⅱ及光合机构恢复能力的影响。结果表明:HH和HH下适当遮光(HL, HH with proper shading)均导致番茄幼苗叶片的光合作用效率显著降低,非气孔性限制起主导作用。番茄幼苗叶片PSⅡ反应中心活性降低,PSⅡ电子传递受阻,PsbO和PsbA基因相对表达量降低,即HH和HL对番茄幼苗叶片的主要作用位点为PSⅡ供体侧放氧复合体(OEC)和PSⅡ受体侧QA向QB的传递过程,其原因主要与OEC功能的破坏及D1蛋白的降解有关。HH胁迫下PsbA基因相对表达量降低幅度大于PsbO,并且标准化OJIP曲线上2 ms处相对可变荧光(VJ)的增加幅度大于0.3 ms处相对可变荧光(VK);HL胁迫下PsbA和PsbO基因相对表达量均有降低,但幅度小于HH。说明HH胁迫对番茄幼苗PSⅡ受体侧的伤害程度大于供体侧,HL胁迫下番茄PSⅡ供体侧和受体侧均有损伤,但伤害程度较弱。经12 h恢复后,HH和HL的光合作用能力均有不同程度的提高,适当遮光提高的程度较多,且PSⅡ供体侧和受体侧基本可以恢复到对照水平。此外,HH和HL下番茄幼苗PSⅡ反应中心对光能的捕获及利用能力降低,单位面积有活性反应中心的数量和吸收光能用于电子传递的能量比例均有不同程度的下降,PSⅡ反应中心吸收光能多以热能形式进行耗散。HH和HL经12 h恢复后均有不同程度的增加,HL增加的幅度较明显。因此,在番茄设施越夏栽培的种植和推广时,可以考虑通过遮光网适当遮光的方式缓解高温强光对番茄的产量和品质造成的影响。
基金supported by Beijing Natural Science Foundation(No.JQ22006)King Abdullah University of Science and Technology Research Funding(KRF)under Award(No.ORA-2021-CRG10-4668.4).
文摘Open-shell oligomers and polymers have exhibited intriguing electronic and magnetic properties, making them highly desirable for a wide range of applications, including ambipolar organic field-effect transistors (OFETs), photodetectors, organic thermoelectrics, and spintronics. Although open-shell ground states have been observed in certain small molecules and doped organic semiconductors, the exploration of open-shell ground-state conjugated polymers is still limited, and the strategies for designing these polymers remain obscure. This review aims to briefly introduce the theory and characterization methods of open-shell conjugated polymers, along with an overview of recent progress and applications. The objective is to stimulate further advancements and investigations in this promising area by shedding light on the potential of open-shell conjugated polymers and the challenges that lie ahead.
