Despite the impressive power conversion efficiency(PCE)beyond 25.5%,perovskite solar cells,especially the Sn-based variants,are poorly stable under normal operating conditions compared with the market-dominant silicon...Despite the impressive power conversion efficiency(PCE)beyond 25.5%,perovskite solar cells,especially the Sn-based variants,are poorly stable under normal operating conditions compared with the market-dominant silicon solar cells that can last for over 25 years.2D3D hybrid perovskite materials are one of the best options to overcome the instability chal-lenge without compromising efficiency.Indeed,a record performance of 1 year was reported in Pb-based 2D3D planar per-ovskite devices.However,the reaction between 2 and 3D perovskite molecules requires high temperatures(-300°C)and increased reaction time(-24 h)to achieve high-quality 2D3D hybrid perovskites.Herein,we base on the ability of chlorine to displace iodine from its ionic compounds in solutions to utilize chloride ions as catalysts for speeding up the reaction between iodine-based 2D and 3D perovskite molecules.The approach reduces the reaction time to-20 min and the reaction temperature to-100°C with the formation of high-quality 2D3D hybrid perovskites,free from pure 2D traces.Integrating the synthesized 2D3D hybrid perovskite material with 50%chlorine doping in a fiber-shaped solar cell architecture yielded the highest reported PCE of 11.96%in Sn-based fiber-shaped perovskite solar cells.The unencapsulated and encapsulated fiber-shaped solar cells could maintain 75%and 95.5%of their original PCE,respectively,after 3 months under room light and relative humidity of 35–40%,revealing the champion stability in Sn-based perovskite solar devices.The solar yarn also demonstrated constant energy output under changing light incident angles(0–180°).展开更多
Leukocyte immunoglobulin-like receptors(LILRs),also called CD85s,ILTs,or LIRs,are important mediators of immune activation and tolerance that contain tandem immunoglobulin(Ig)-like folds.There are 11(in addition to tw...Leukocyte immunoglobulin-like receptors(LILRs),also called CD85s,ILTs,or LIRs,are important mediators of immune activation and tolerance that contain tandem immunoglobulin(Ig)-like folds.There are 11(in addition to two pseudogenes)LILRs in total,two with two Ig-like domains(D1D2)and the remaining nine with four Ig-like domains(D1D2D3D4).Thus far,the structural features of the D1D2 domains of LILR proteins are well defi ned,but no structures for the D3D4 domains have been reported.This is a very important fi eld to be studied as it relates to the unknown functions of the D3D4 domains,as well as their relative orientation to the D1D2 domains on the cell surface.Here,we report the crystal structures of the D3D4 domains of both LILRB1 and LILRB2.The two Ig-like domains of both LILRB1-D3D4 and LILRB2-D3D4 are arranged at an acute angle(~60°)to form a bent struc-ture,resembling the structures of natural killer inhibitory receptors.Based on these two D3D4 domain structures and previously reported D1D2/HLA I complex structures,two alternative models of full-length(four Ig-like domains)LILR molecules bound to HLA I are proposed.展开更多
The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spac...The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spacer cation and the quality of the 2D capping layer are critical factors in achieving the required results.In this study,we compared two fluorinated salts:4-(trifluoromethyl)benzamidine hydrochloride(4TF-BA·HCl)and 4-fluorobenzamidine hydrochloride(4F-BA·HCl)to engineer the 3D/2D perovskite films.Surprisingly,4F-BA formed a high-performance 3D/2D heterojunction,while4TF-BA produced an amorphous layer on the perovskite films.Our findings indicate that the balanced intramolecular charge polarization,which leads to effective hydrogen bonding,is more favorable in 4F-BA than in 4TF-BA,promoting the formation of a crystalline 2D perovskite.Nevertheless,4TF-BA managed to improve efficiency to 24%,surpassing the control device,primarily due to the natural passivation capabilities of benzamidine.Interestingly,the devices based on 4F-BA demonstrated an efficiency exceeding 25%with greater longevity under various storage conditions compared to 4TF-BA-based and the control devices.展开更多
基金thank the Shenzhen-Hong Kong-Macao Science and Technology Plan Project(Category C,Grant No.ZGCP)Research Grants Council of Hong Kong(Grant No.15302121)+4 种基金National Natural Science Foundation of China(21975214)National Key R&D Program of China(Grant No.2018YFC2000900)Seed Fund of Research Institute of Intelligent Wearable Systems(Grant No.CD45)Start-up Fund of The Hong Kong Polytechnic University(Grant No.BE1H)Departmental General Research Fund of The Hong Kong Polytechnic University(Grant No.UAME),and The Hong Kong Ph.D.Fellowship Scheme.
文摘Despite the impressive power conversion efficiency(PCE)beyond 25.5%,perovskite solar cells,especially the Sn-based variants,are poorly stable under normal operating conditions compared with the market-dominant silicon solar cells that can last for over 25 years.2D3D hybrid perovskite materials are one of the best options to overcome the instability chal-lenge without compromising efficiency.Indeed,a record performance of 1 year was reported in Pb-based 2D3D planar per-ovskite devices.However,the reaction between 2 and 3D perovskite molecules requires high temperatures(-300°C)and increased reaction time(-24 h)to achieve high-quality 2D3D hybrid perovskites.Herein,we base on the ability of chlorine to displace iodine from its ionic compounds in solutions to utilize chloride ions as catalysts for speeding up the reaction between iodine-based 2D and 3D perovskite molecules.The approach reduces the reaction time to-20 min and the reaction temperature to-100°C with the formation of high-quality 2D3D hybrid perovskites,free from pure 2D traces.Integrating the synthesized 2D3D hybrid perovskite material with 50%chlorine doping in a fiber-shaped solar cell architecture yielded the highest reported PCE of 11.96%in Sn-based fiber-shaped perovskite solar cells.The unencapsulated and encapsulated fiber-shaped solar cells could maintain 75%and 95.5%of their original PCE,respectively,after 3 months under room light and relative humidity of 35–40%,revealing the champion stability in Sn-based perovskite solar devices.The solar yarn also demonstrated constant energy output under changing light incident angles(0–180°).
基金the China National Grand S&T Spe-cial Project(No.2012ZX10001006)the National Natural Science Foundation of China(Grant No.31030030)GFG is a leading principal investigator of the NSFC Innovative Research Group(Grant No.81021003).
文摘Leukocyte immunoglobulin-like receptors(LILRs),also called CD85s,ILTs,or LIRs,are important mediators of immune activation and tolerance that contain tandem immunoglobulin(Ig)-like folds.There are 11(in addition to two pseudogenes)LILRs in total,two with two Ig-like domains(D1D2)and the remaining nine with four Ig-like domains(D1D2D3D4).Thus far,the structural features of the D1D2 domains of LILR proteins are well defi ned,but no structures for the D3D4 domains have been reported.This is a very important fi eld to be studied as it relates to the unknown functions of the D3D4 domains,as well as their relative orientation to the D1D2 domains on the cell surface.Here,we report the crystal structures of the D3D4 domains of both LILRB1 and LILRB2.The two Ig-like domains of both LILRB1-D3D4 and LILRB2-D3D4 are arranged at an acute angle(~60°)to form a bent struc-ture,resembling the structures of natural killer inhibitory receptors.Based on these two D3D4 domain structures and previously reported D1D2/HLA I complex structures,two alternative models of full-length(four Ig-like domains)LILR molecules bound to HLA I are proposed.
基金supported by the National Key Research and Development Programs-Intergovernmental International Cooperation in Science and Technology Innovation Project(Grant No.2022YFE0118400)the Natural Science Foundation of Hunan Province(2023JJ50132)+1 种基金Shenzhen Science and Technology Innovation Committee(Grants Nos.JCYJ20220818100211025,and KCXST20221021111616039)Shenzhen Science and Technology Program(No.20231128110928003)。
文摘The introduction of two-dimensional(2D)perovskite layers on top of three-dimensional(3D)perovskite films enhances the performance and stability of perovskite solar cells(PSCs).However,the electronic effect of the spacer cation and the quality of the 2D capping layer are critical factors in achieving the required results.In this study,we compared two fluorinated salts:4-(trifluoromethyl)benzamidine hydrochloride(4TF-BA·HCl)and 4-fluorobenzamidine hydrochloride(4F-BA·HCl)to engineer the 3D/2D perovskite films.Surprisingly,4F-BA formed a high-performance 3D/2D heterojunction,while4TF-BA produced an amorphous layer on the perovskite films.Our findings indicate that the balanced intramolecular charge polarization,which leads to effective hydrogen bonding,is more favorable in 4F-BA than in 4TF-BA,promoting the formation of a crystalline 2D perovskite.Nevertheless,4TF-BA managed to improve efficiency to 24%,surpassing the control device,primarily due to the natural passivation capabilities of benzamidine.Interestingly,the devices based on 4F-BA demonstrated an efficiency exceeding 25%with greater longevity under various storage conditions compared to 4TF-BA-based and the control devices.
