The multi-component strategy has proven effective in advancing the performance of organic photovoltaics(OPVs),enhancing photocurrent andfill factor through spectral complementarity and morphology optimization.However,t...The multi-component strategy has proven effective in advancing the performance of organic photovoltaics(OPVs),enhancing photocurrent andfill factor through spectral complementarity and morphology optimization.However,the open-circuit voltage(VOC)mechanism in multi-component systems lacks systematic investiga-tion.In this study,we explore the influence of alloy-like phases on energy level distribution and energy loss mechanisms in multi-component OPVs.Appropriate modulation of donor alloy-like phases maintains the original intermolecular stack-ing,enhances component compatibility,reduces acceptor aggregation,and improves acceptor phase purity,mitigating non-radiative recombination losses.Additionally,suitable alloy-like phase modulation elevates charge transfer(CT)states,reducing the gap between CT and local exciton state,lowering reorganization energy,and alleviating radiative recombination loss below the bandgap.Through synergistic optimization(layer-by-layer method with solid additive),ternary devices based on Y6 acceptor achieve a notable 19.41%power conversion efficiency,offering new insights for the analysis of the energy loss of the multi-component OPVs.展开更多
The microstructure of the active layer in organic photovoltaics(OPVs),such as the size of phase separation,purity of the phases,and molecular packing within each phase,plays a crucial role in influencing the behavior ...The microstructure of the active layer in organic photovoltaics(OPVs),such as the size of phase separation,purity of the phases,and molecular packing within each phase,plays a crucial role in influencing the behavior of excitons and charge carriers within the active layer.It is also a key determinant of the photovoltaic performance of the device.During the optimization of OPV devices,the use of additives has been demonstrated to be an effective strategy in microstructure control,leading to enhanced performance.Therefore,the quest for stable and efficient novel additives,along with an exploration and summarization of the mechanisms underlying additive-induced microstructure control,is essential for a better understanding of the developmental trends of high-performance additives.In this review,we categorize additives based on their chemical structures and discuss their effects on the microstructure of the active layer from both thermodynamic and kinetic perspectives.Furthermore,we elaborate on the working mechanisms and their impact on the photovoltaic performance of the devices.This review provides an overview of recent advances in additives for OPVs,offering potential guidance for the future development of additives and further optimization of the active layer in photovoltaic devices.展开更多
基金Zhejiang Provincial Natural Science Foundation,Grant/Award Numbers:LQ23E030002,LZ23B040001National Natural Science Foundation of China,Grant/Award Numbers:52303226,21971049+1 种基金Hangzhou Normal University,Grant/Award Number:4095C50222204002National Key Research and Development Program of China,Grant/Award Number:2019YFA0705902。
文摘The multi-component strategy has proven effective in advancing the performance of organic photovoltaics(OPVs),enhancing photocurrent andfill factor through spectral complementarity and morphology optimization.However,the open-circuit voltage(VOC)mechanism in multi-component systems lacks systematic investiga-tion.In this study,we explore the influence of alloy-like phases on energy level distribution and energy loss mechanisms in multi-component OPVs.Appropriate modulation of donor alloy-like phases maintains the original intermolecular stack-ing,enhances component compatibility,reduces acceptor aggregation,and improves acceptor phase purity,mitigating non-radiative recombination losses.Additionally,suitable alloy-like phase modulation elevates charge transfer(CT)states,reducing the gap between CT and local exciton state,lowering reorganization energy,and alleviating radiative recombination loss below the bandgap.Through synergistic optimization(layer-by-layer method with solid additive),ternary devices based on Y6 acceptor achieve a notable 19.41%power conversion efficiency,offering new insights for the analysis of the energy loss of the multi-component OPVs.
基金supported by the National Natural Science Foundation of China(Nos.52303226,21971049)Zhejiang Provincial Natural Science Foundation(Nos.LQ23E030002,LZ23B040001)“Ten-thousand Talents Plan”of Zhejiang Province(No.2019R52040)。
文摘The microstructure of the active layer in organic photovoltaics(OPVs),such as the size of phase separation,purity of the phases,and molecular packing within each phase,plays a crucial role in influencing the behavior of excitons and charge carriers within the active layer.It is also a key determinant of the photovoltaic performance of the device.During the optimization of OPV devices,the use of additives has been demonstrated to be an effective strategy in microstructure control,leading to enhanced performance.Therefore,the quest for stable and efficient novel additives,along with an exploration and summarization of the mechanisms underlying additive-induced microstructure control,is essential for a better understanding of the developmental trends of high-performance additives.In this review,we categorize additives based on their chemical structures and discuss their effects on the microstructure of the active layer from both thermodynamic and kinetic perspectives.Furthermore,we elaborate on the working mechanisms and their impact on the photovoltaic performance of the devices.This review provides an overview of recent advances in additives for OPVs,offering potential guidance for the future development of additives and further optimization of the active layer in photovoltaic devices.
