In organic photovoltaics(OPVs),theπ-orbital D18-Cl coherent stack ofπ-conjugated polymers in the active layer exerts a profound influence on exciton dissociation and charge transport.Nevertheless,the structural flex...In organic photovoltaics(OPVs),theπ-orbital D18-Cl coherent stack ofπ-conjugated polymers in the active layer exerts a profound influence on exciton dissociation and charge transport.Nevertheless,the structural flexibility intrinsic ofπ-conjugated polymers fundamentally restricts orderedπ-orbital coherent stack,thereby establishing persistent performance limitations in OPVs.Here,we demonstrate a universal crystalinduced polymericπ-orbital coherent stack reinforcement strategy by incorporating nano-monolayer nickel phosphorus trisulfide(NiPS_(3))crystal as a multifunctional additive,to modulates tighterπ–πstacking and extended crystallite coherence length.These structural improvements synergistically extend exciton lifetime,suppress carrier recombination,and optimize charge transport.Consequently,OPVs based on D18-Cl:L8-BO system achieves an impressive power conversion efficiency(PCE)of 20.83%with concurrent improvements in short-circuit current density and fill factor.The universality of this approach is further confirmed in PM6:L8-BO(PCE boosts from 17.41%±0.21%to 18.08%±0.11%)and D18:L8-BO(PCE improves from 19.20%±0.27%to 20.19%±0.20%)systems,where nano-monolayer NiPS_(3) crystal universally mediates the formation of tightlyπ-orbital coherent stack ofπ-conjugated polymers with enhanced crystallite coherence length.This work establishes nano-monolayer NiPS_(3) crystal as powerful tools for modulatesπ-orbital coherent stack of conjugated polymers,offering a materials-agnostic pathway toward high-efficiency OPVs.展开更多
Coherent pulse stacking（CPS） is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy and high average power. A Z-domain model target...Coherent pulse stacking（CPS） is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy and high average power. A Z-domain model targeting the pulsed laser is assembled to describe the optical interference process. An algorithm, extracting the cavity phase and pulse phases from limited data, where only the pulse intensity is available, is developed to diagnose optical cavity resonators. We also implement the algorithm on the cascaded system of multiple optical cavities,achieving phase errors less than 1.0°（root mean square）, which could ensure the stability of CPS.展开更多
基金the National Natural Science Foundation of China(NSFC,No.62404094)the Natural Science Foundation of Hunan Province(No.2023JJ40532)+1 种基金the Fund of University of South China(Nos.210XQD018 and 5524GC017)the Fund of Hengyang Science and Technology Bureau(No.202121014588).
文摘In organic photovoltaics(OPVs),theπ-orbital D18-Cl coherent stack ofπ-conjugated polymers in the active layer exerts a profound influence on exciton dissociation and charge transport.Nevertheless,the structural flexibility intrinsic ofπ-conjugated polymers fundamentally restricts orderedπ-orbital coherent stack,thereby establishing persistent performance limitations in OPVs.Here,we demonstrate a universal crystalinduced polymericπ-orbital coherent stack reinforcement strategy by incorporating nano-monolayer nickel phosphorus trisulfide(NiPS_(3))crystal as a multifunctional additive,to modulates tighterπ–πstacking and extended crystallite coherence length.These structural improvements synergistically extend exciton lifetime,suppress carrier recombination,and optimize charge transport.Consequently,OPVs based on D18-Cl:L8-BO system achieves an impressive power conversion efficiency(PCE)of 20.83%with concurrent improvements in short-circuit current density and fill factor.The universality of this approach is further confirmed in PM6:L8-BO(PCE boosts from 17.41%±0.21%to 18.08%±0.11%)and D18:L8-BO(PCE improves from 19.20%±0.27%to 20.19%±0.20%)systems,where nano-monolayer NiPS_(3) crystal universally mediates the formation of tightlyπ-orbital coherent stack ofπ-conjugated polymers with enhanced crystallite coherence length.This work establishes nano-monolayer NiPS_(3) crystal as powerful tools for modulatesπ-orbital coherent stack of conjugated polymers,offering a materials-agnostic pathway toward high-efficiency OPVs.
基金supported by the Director,Office of Science,Office of High Energy Physics,of the U.S.Department of Energy under Contract No.DE-AC02-05CH11231by the National Natural Science Foundation of China under Grant No.11475097
文摘Coherent pulse stacking（CPS） is a new time-domain coherent addition technique that stacks several optical pulses into a single output pulse, enabling high pulse energy and high average power. A Z-domain model targeting the pulsed laser is assembled to describe the optical interference process. An algorithm, extracting the cavity phase and pulse phases from limited data, where only the pulse intensity is available, is developed to diagnose optical cavity resonators. We also implement the algorithm on the cascaded system of multiple optical cavities,achieving phase errors less than 1.0°（root mean square）, which could ensure the stability of CPS.
