Power conversion efficiency(PCE)of single-junction polymer solar cells(PSCs)has made a remarkable breakthrough recently.Plenty of work was reported to achieve PCEs higher than 16%derived from the PM6:Y6 binary system....Power conversion efficiency(PCE)of single-junction polymer solar cells(PSCs)has made a remarkable breakthrough recently.Plenty of work was reported to achieve PCEs higher than 16%derived from the PM6:Y6 binary system.To further increase the PCEs of binary OSCs incorporating small molecular acceptor(SMA)Y6,we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital(HOMO)of PM7.Consequently,the PM7:Y6 has achieved PCEs as high as 17.0%by the hotcast method,due to the improved open-circuit voltage(VOC).Compared with PM6,the lower HOMO of PM7 increases the gap between ELUMO-donor and EHOMO-acceptor,which is proportional to VOC.This research provides a high PCE for single-junction binary PSCs,which is meaningful for device fabrication related to PM7 and commercialization of PSCs.展开更多
Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work...Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically investigated.The results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the SMAs.After blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)ones.The enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor polymer.This work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.展开更多
Metal-semiconductor ohmic contacts are required to reduce the energy dissipation for two-dimensional (2D) electronic devices, and phase engineering of 2D transition-metal dichalcogenides (TMDCs) is a promising approac...Metal-semiconductor ohmic contacts are required to reduce the energy dissipation for two-dimensional (2D) electronic devices, and phase engineering of 2D transition-metal dichalcogenides (TMDCs) is a promising approach for building ohmic contacts. Here, 2D in-plane 1T′-2H MoTe2 homojunctions were prepared by direct epitaxy via vapor deposition. The interface properties of in-plane 1T′-2H MoTe2 homojunction were investigated in detail by combining experiments, calculations and theories. The ohmic contact properties of 1T′-2H MoTe2 homojunction were proved according to Kelvin force probe microscopy and density functional theory calculations. The charge carriers robust transport in in-plane 1T′-2H MoTe2 homojunction without Fermi-level pinning can be well described by Poisson equation and band alignment. These results indicate that phase engineering of 2D TMDCs is promising to construct ohmic contacts for device applications.展开更多
A bacterial cell has many different two component systems(TCSs)that allow it to sense and adapt to various environmental stimulations,such as temperature,oxygen concentration,degree of acidity and alkalinity[1].Each T...A bacterial cell has many different two component systems(TCSs)that allow it to sense and adapt to various environmental stimulations,such as temperature,oxygen concentration,degree of acidity and alkalinity[1].Each TCS is composed of a sensor histidine kinase(HK)and a response regulator(RR)[2,3].To investigate TCSs in a systematical way,we built light-sensing TCSs in E.coli by reengineering wild-type HKs.A modified HK展开更多
Conventional self-assembled monolayer(SAM)hole transporters in organic solar cells(OSCs)generally suffer from poor uniformity and limited thickness tolerance,hindering their large-scale production.To overcome these li...Conventional self-assembled monolayer(SAM)hole transporters in organic solar cells(OSCs)generally suffer from poor uniformity and limited thickness tolerance,hindering their large-scale production.To overcome these limitations,we introduce a novel polymeric hole transporter synthesized by polymerizing carbazole phosphonic acid(PACz).The resultant Poly-2PACz material exhibits exceptional conductivity,high tolerance for variations in layer thickness,and improved film uniformity compared with conventional SAMs.Consequently,the OSCs utilizing Poly-2PACz achieve a remarkable power conversion efficiency of 19.1%and a high fill factor of 81.2%,surpassing the devices based on 2PACz.Moreover,Poly-2PACz-based OSCs demonstrate excellent operational stability,retaining over 80%of their initial efficiency after 1,400 h of continuous light exposure in ambient conditions.This work presents a novel strategy for designing hole transporters,paving the way for more efficient and stable OSCs.展开更多
Dear Editor,Understanding physical protein–protein interactions(PPIs)in vivo is amajor challenge in elucidating the molecular mechanisms in complex biological systems.Although many approaches,such as the yeast two-hy...Dear Editor,Understanding physical protein–protein interactions(PPIs)in vivo is amajor challenge in elucidating the molecular mechanisms in complex biological systems.Although many approaches,such as the yeast two-hybrid(Y2H)assay,protein fragmentcomplementary assay(PCA),and fluorescence resonance energy transfer(FRET)assay,have been developed to assess the intensity of interaction of proteins in living cells,they have practical limitations for quantitation(Morell et al.,2009;Padilla-Parra and Tramier,2012;Stynen et al.,2012).Nucleic acid-based technologies,such as quantitative PCR(qPCR),DNA microarray,and deep sequencing,are probably most featured with quantification,high-throughput,and cost-effective for operation.Recently,new methods of detecting biomolecular interactions have been developed based on a strategy that labels target interactions using specific nucleic acid sequences(Soderberg et al.,2006;Yu et al.,2011;Zhu et al.,2013).展开更多
基金supported by Shen Zhen Technology and Innovation Commission(JCYJ20170413173814007,JCYJ20170818113905024)Hong Kong Research Grants Council(Research Impact Fund R6021-18,16305915,16322416,606012,16303917)+2 种基金Hong Kong Innovation and Technology Commission(ITCCNERC14SC01,ITS/471/18)supported by National Natural Science Foundation of China(51573120,51973146,91633301)Collaborative Innovation Center of Suzhou Nano Science&Technology,and the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Power conversion efficiency(PCE)of single-junction polymer solar cells(PSCs)has made a remarkable breakthrough recently.Plenty of work was reported to achieve PCEs higher than 16%derived from the PM6:Y6 binary system.To further increase the PCEs of binary OSCs incorporating small molecular acceptor(SMA)Y6,we substituted PM6 with PM7 due to the deeper highest occupied molecular orbital(HOMO)of PM7.Consequently,the PM7:Y6 has achieved PCEs as high as 17.0%by the hotcast method,due to the improved open-circuit voltage(VOC).Compared with PM6,the lower HOMO of PM7 increases the gap between ELUMO-donor and EHOMO-acceptor,which is proportional to VOC.This research provides a high PCE for single-junction binary PSCs,which is meaningful for device fabrication related to PM7 and commercialization of PSCs.
基金supported by the National Natural Science Foundation of China(91433202,52103202)National Key Research and Development Program of China(2019YFA0705900)funded by MOST+10 种基金the Basic and Applied Research Major Program of Guangdong Province(2019B030302007)the Shenzhen Science and Technology Innovation Commission(Shenzhen Fundamental Research Program,JCYJ20200109140801751)the Hong Kong Research Grants Council(RIF project R6021-18,CRF project C6023-19G,GRF project 16310019,16310020)Hong Kong Innovation and Technology Commission(ITCCNERC14SC01)and Foshan-HKUST(FSUST19-CAT0202)the support from Ministry of Science and Technology(2016YFA0200700)NSFC(21704082,21875182,21534003)Key Scientific and Technological Innovation Team Project of Shaanxi Province(2020TD-002)China Postdoctoral Science Foundation(2017M623162)111 project 2.0(BP2018008)the financial support from Research Grant Council of Hong Kong(14303519)CUHK Direct Grant(4053415)。
文摘Side-chain engineering has been demonstrated as an effective method for fine-tuning the optical,electrical,and morphological properties of organic semiconductors toward efficient organic solar cells(OSCs).In this work,three isomeric non-fullerene small molecule acceptors(SMAs),named as BTP-4F-T2C8,BTP-4F-T2EH and BTP-4F-T3EH,with linear and branched alkyl chains substituted on the α or β positions of thiophene as the side chains,were synthesized and systematically investigated.The results demonstrate that the size and substitution position of alkyl side chains can greatly affect the electronic properties,molecular packing as well as crystallinity of the SMAs.After blending with donor polymer D18-Cl,the prominent device performance of 18.25% was achieved by the BTP-4F-T3EH-based solar cells,which is higher than those of the BTP-4F-T2EH-based(17.41%)and BTP-4F-T2C8-based(15.92%)ones.The enhanced performance of the BTP-4F-T3EH-based devices is attributed to its stronger crystallinity,higher electron mobility,suppressed bimolecular recombination,and the appropriate intermolecular interaction with the donor polymer.This work reveals that the side chain isomerization strategy can be a practical way in tuning the molecular packing and blend morphology for improving the performance of organic solar cells.
基金This work was supported by the Grants from National Natural Science Foundation of China(No.11874316)Scientific Research Fund of Hunan Provincial Education Department(No.18A059)+2 种基金the Hunan Provincial Innovation Foundation for Postgraduate(No.CX2018B321)the Project of Xiangtan Science and Technology Bureau(No.CXY-ZD20172002)Innovative Research Team in University(No.IRT 17R91).
文摘Metal-semiconductor ohmic contacts are required to reduce the energy dissipation for two-dimensional (2D) electronic devices, and phase engineering of 2D transition-metal dichalcogenides (TMDCs) is a promising approach for building ohmic contacts. Here, 2D in-plane 1T′-2H MoTe2 homojunctions were prepared by direct epitaxy via vapor deposition. The interface properties of in-plane 1T′-2H MoTe2 homojunction were investigated in detail by combining experiments, calculations and theories. The ohmic contact properties of 1T′-2H MoTe2 homojunction were proved according to Kelvin force probe microscopy and density functional theory calculations. The charge carriers robust transport in in-plane 1T′-2H MoTe2 homojunction without Fermi-level pinning can be well described by Poisson equation and band alignment. These results indicate that phase engineering of 2D TMDCs is promising to construct ohmic contacts for device applications.
基金supported by grants to W.J.R.from the National Natural Science Foundation of China(31130034 and 31470808)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA12000000)grants to Z.L.from the Ministry of Science and Technology(2014CB910600)
文摘A bacterial cell has many different two component systems(TCSs)that allow it to sense and adapt to various environmental stimulations,such as temperature,oxygen concentration,degree of acidity and alkalinity[1].Each TCS is composed of a sensor histidine kinase(HK)and a response regulator(RR)[2,3].To investigate TCSs in a systematical way,we built light-sensing TCSs in E.coli by reengineering wild-type HKs.A modified HK
基金supported by the National Natural Science Foundation of China(52372196)the Natural Science Foundation of Jiangsu Province(BK20230794)Jiangsu Association for Science and Technology(TJ-2022-056)。
文摘Conventional self-assembled monolayer(SAM)hole transporters in organic solar cells(OSCs)generally suffer from poor uniformity and limited thickness tolerance,hindering their large-scale production.To overcome these limitations,we introduce a novel polymeric hole transporter synthesized by polymerizing carbazole phosphonic acid(PACz).The resultant Poly-2PACz material exhibits exceptional conductivity,high tolerance for variations in layer thickness,and improved film uniformity compared with conventional SAMs.Consequently,the OSCs utilizing Poly-2PACz achieve a remarkable power conversion efficiency of 19.1%and a high fill factor of 81.2%,surpassing the devices based on 2PACz.Moreover,Poly-2PACz-based OSCs demonstrate excellent operational stability,retaining over 80%of their initial efficiency after 1,400 h of continuous light exposure in ambient conditions.This work presents a novel strategy for designing hole transporters,paving the way for more efficient and stable OSCs.
基金supported by grants to J.W.from the National Natural Science Foundation of China(31130034)the Ministry of Science and Technology(2011CB910200)+1 种基金the Science and Technology Commission of Shanghai Municipality(13DZ1940100)by grants to Z.L.from the Ministry of Science and Technology(2012CB917200,2014CB910600).
文摘Dear Editor,Understanding physical protein–protein interactions(PPIs)in vivo is amajor challenge in elucidating the molecular mechanisms in complex biological systems.Although many approaches,such as the yeast two-hybrid(Y2H)assay,protein fragmentcomplementary assay(PCA),and fluorescence resonance energy transfer(FRET)assay,have been developed to assess the intensity of interaction of proteins in living cells,they have practical limitations for quantitation(Morell et al.,2009;Padilla-Parra and Tramier,2012;Stynen et al.,2012).Nucleic acid-based technologies,such as quantitative PCR(qPCR),DNA microarray,and deep sequencing,are probably most featured with quantification,high-throughput,and cost-effective for operation.Recently,new methods of detecting biomolecular interactions have been developed based on a strategy that labels target interactions using specific nucleic acid sequences(Soderberg et al.,2006;Yu et al.,2011;Zhu et al.,2013).
