Recently perovskite solar cells(PSCs),as photoelectric conversion devices,exhibit excellent power conversion efficiency(PCE)and low-processing cost,and have become one of the most promising devices to replace conventi...Recently perovskite solar cells(PSCs),as photoelectric conversion devices,exhibit excellent power conversion efficiency(PCE)and low-processing cost,and have become one of the most promising devices to replace conventional silicon-based solar cells and address current pressing energy issues.Among them,the flexible PSCs are especially more widely applicable and may propel the rapid advancements of wearable electronics,causing a significant paradigm shift in consumer electronics.Current flexible PSCs use non-biodegradable petroleum-based polymer substrates,discarding of which will aggravate“white pollution”.Therefore,development of green,biodegradable and low-cost flexible substrates will provide a great alternative to flexible PSCs.Here we have developed transparent nanocellulose paper(NCP)with coating of acrylic resin as substrates to fabricate flexible PSCs,which are biodegradable and easily disposable.The PCE of these NCP-based PSCs reached 4.25%,while the power per weight(the ratio of power to device weight)was as high as 0.56 W g^(–1).The flexible PSCs also showed good stability,retaining>80%of original efficiency after 50 times of bending.The NCP-based substrates can also be applied to other electronic systems,which may prosper next-generation green flexible electronics.展开更多
Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing,data encryption,information anti-counterfeiting and so forth.However,effective ways to achieve highly...Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing,data encryption,information anti-counterfeiting and so forth.However,effective ways to achieve highly efficient ultralong organic phosphorescence(UOP)in metal-free organic materials remain a great challenge.Herein,we designed three isomers based on asymmetric triazines with various bromine substituted positions.Impressively,phosphorescence efficiency of p-BrAT in solid state can reach up to 9.7%with a long lifetime of 386 ms,which was one of the highest efficient UOP materials reported so far.Theoretical calculations further demonstrated that para-substitution exhibited the most effective radiative transition for triplet excitons.These results will provide an effective approach to achieving highly efficient UOP materials.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Grants 21675085,51602149,61705102,and 91733302)the National Key R&D Program of China(Grant 2017YFA0204700)+3 种基金the National Basic Research Program of China,Fundamental Studies of Perovskite Solar Cells(Grant 2015CB932200)the Natural Science Foundation of Jiangsu Province for Distinguished Young Scholars(Grant BK20170042)the Natural Science Foundation of Jiangsu Province(Grants BK20161011 and BK20161010)Young 1000 Talents Global Recruitment Program of China,Jiangsu Specially-Appointed Professor Program,and“Six Talent Peaks”Project in Jiangsu Province,China.
文摘Recently perovskite solar cells(PSCs),as photoelectric conversion devices,exhibit excellent power conversion efficiency(PCE)and low-processing cost,and have become one of the most promising devices to replace conventional silicon-based solar cells and address current pressing energy issues.Among them,the flexible PSCs are especially more widely applicable and may propel the rapid advancements of wearable electronics,causing a significant paradigm shift in consumer electronics.Current flexible PSCs use non-biodegradable petroleum-based polymer substrates,discarding of which will aggravate“white pollution”.Therefore,development of green,biodegradable and low-cost flexible substrates will provide a great alternative to flexible PSCs.Here we have developed transparent nanocellulose paper(NCP)with coating of acrylic resin as substrates to fabricate flexible PSCs,which are biodegradable and easily disposable.The PCE of these NCP-based PSCs reached 4.25%,while the power per weight(the ratio of power to device weight)was as high as 0.56 W g^(–1).The flexible PSCs also showed good stability,retaining>80%of original efficiency after 50 times of bending.The NCP-based substrates can also be applied to other electronic systems,which may prosper next-generation green flexible electronics.
基金supported by the National Natural Science Foundation of China(Nos.21875104 and 51673095)National Basic Research Program of China(973 Program,No.2015CB932200)+4 种基金Natural Science Fund for Distinguished Young Scholars(No.BK20180037)the Natural Science Fund for Colleges and Universities(No.17KJB430020)"High-Level Talents in Six Industries"(No.XCL-025)of Jiangsu ProvinceNanjing Tech Start-up Grant(Nos.3983500158 and 3983500169)the High Performance Computing Centre of Nanjing Tech University for supporting the computational resources
文摘Ultralong organic phosphorescent materials have invoked considerable attention for their great potential in sensing,data encryption,information anti-counterfeiting and so forth.However,effective ways to achieve highly efficient ultralong organic phosphorescence(UOP)in metal-free organic materials remain a great challenge.Herein,we designed three isomers based on asymmetric triazines with various bromine substituted positions.Impressively,phosphorescence efficiency of p-BrAT in solid state can reach up to 9.7%with a long lifetime of 386 ms,which was one of the highest efficient UOP materials reported so far.Theoretical calculations further demonstrated that para-substitution exhibited the most effective radiative transition for triplet excitons.These results will provide an effective approach to achieving highly efficient UOP materials.
