Over last decades,the development of new organic materials has contributed to the rapid increase of high-power conversion efficiency of photovoltaic cells.At this stage,to understand the structure and the dynamic of m...Over last decades,the development of new organic materials has contributed to the rapid increase of high-power conversion efficiency of photovoltaic cells.At this stage,to understand the structure and the dynamic of materials is of significant importance for designing novel low-cost photovoltaic cells with superior performance.Neutron scattering is a powerful tool to provide unique and non-destructive information for the organic photovoltaic materials with particular advantages of addressing different parts of organic system by deuterium or tritium substitution.In addition,by employing several neutron scattering methods together,it is possible to further access the static structure and dynamic relaxation of the materials.With this perspective review,we introduce three neutron scattering techniques,including neutron reflectivity,small angle neutron scattering,grazing incidence small angle neutron scattering and quasi-elastic neutron scattering,and their applications on the organic photovoltaic materials.展开更多
In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago a...In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The r/p of 7.4% was achieved in the year 2010, and r/p of 9.2% was disclosed and confirmed at website of Mitsubishi Chemical in April, 2011. The promising future is that the r/p of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thinfilm solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture.展开更多
Two novel organic small molecule donor materials(FLU),TDPP and(DFLU)_(2)TDPP based on diketopyrrolopyrrole-fluorene were designed and synthesized successfully.The D-D-π-A-π-D-D type molecule(DFLU)_(2)TDPP was constr...Two novel organic small molecule donor materials(FLU),TDPP and(DFLU)_(2)TDPP based on diketopyrrolopyrrole-fluorene were designed and synthesized successfully.The D-D-π-A-π-D-D type molecule(DFLU)_(2)TDPP was constructed based on the D-π-A-π-D type molecule(FLU)_(2)TDPP by a backbone extension strategy.The optical absorption,electrochemistry and photovoltaic properties of the two novel materials were investigated in detail.Both(FLU)_(2)TDPP and(DFLU)_(2)TDPP show narrow energy gaps of1.71 and 1.64 eV,respectively.Compared to(FLU)_(2)TDPP,the photovoltaic device based on(DFLU)_(2)TDPP/PC_(71)BM exhibited a higher power conversion efficiency of 2.27%due to its excellent optical absorption,narrow band gap and balanced carrier mobility.This study indicates that skeleton extension strategy is an effective strategy to broaden the molecular absorption range and improve device performance.展开更多
基金supported by the National Natural Science Foundation of China(No.12105306,52072008 and U2032167)Guangdong Natural Science Foundation(No.2019A1515111028)+1 种基金Xiejialin Foundation in the Institute of High Energy Physics(No.E15466U210)National Key R&D Projects(2022YFA1604103 and 2020YFA0406203).
文摘Over last decades,the development of new organic materials has contributed to the rapid increase of high-power conversion efficiency of photovoltaic cells.At this stage,to understand the structure and the dynamic of materials is of significant importance for designing novel low-cost photovoltaic cells with superior performance.Neutron scattering is a powerful tool to provide unique and non-destructive information for the organic photovoltaic materials with particular advantages of addressing different parts of organic system by deuterium or tritium substitution.In addition,by employing several neutron scattering methods together,it is possible to further access the static structure and dynamic relaxation of the materials.With this perspective review,we introduce three neutron scattering techniques,including neutron reflectivity,small angle neutron scattering,grazing incidence small angle neutron scattering and quasi-elastic neutron scattering,and their applications on the organic photovoltaic materials.
基金supported by the National Natural Science Foundation of China (20974046, 61077021 & 61076016)New Century Excellent Talents funding from Ministry of Education of China (NCET-08-0697)National Basic Research Program of China (973 Program, 2009CB930600)
文摘In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The r/p of 7.4% was achieved in the year 2010, and r/p of 9.2% was disclosed and confirmed at website of Mitsubishi Chemical in April, 2011. The promising future is that the r/p of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thinfilm solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture.
基金supported by the National Natural Science Foundation of China(21102013)the Fundamental Research Funds for the Central Universities(DUT16ZD205)
文摘Two novel organic small molecule donor materials(FLU),TDPP and(DFLU)_(2)TDPP based on diketopyrrolopyrrole-fluorene were designed and synthesized successfully.The D-D-π-A-π-D-D type molecule(DFLU)_(2)TDPP was constructed based on the D-π-A-π-D type molecule(FLU)_(2)TDPP by a backbone extension strategy.The optical absorption,electrochemistry and photovoltaic properties of the two novel materials were investigated in detail.Both(FLU)_(2)TDPP and(DFLU)_(2)TDPP show narrow energy gaps of1.71 and 1.64 eV,respectively.Compared to(FLU)_(2)TDPP,the photovoltaic device based on(DFLU)_(2)TDPP/PC_(71)BM exhibited a higher power conversion efficiency of 2.27%due to its excellent optical absorption,narrow band gap and balanced carrier mobility.This study indicates that skeleton extension strategy is an effective strategy to broaden the molecular absorption range and improve device performance.
