为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射...为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外–可见吸收光谱(UV-Vis)和原子力显微镜(AFM)等方法检测分析(EDA)(FA)_2[Pb_3I_(10)]在低湿度及高湿度环境下的结构、形貌以及光学性能变化。结果表明:制备的(EDA)(FA)_2[Pb_3I_(10)]薄膜在相同湿度环境下比当前广泛应用于钙钛矿太阳能电池的甲胺铅碘薄膜(CH_3NH_3PbI_3)稳定性更高;薄膜的光学带隙约为1.67 e V,与太阳能电池最佳带隙比较接近。另外,(EDA)(FA)_2[Pb_3I_(10)]薄膜在可见光范围吸光性能较好;薄膜的粗糙度很小,适合制备太阳能电池,而且,成本较硅基太阳能电池低廉,在分子水平较CH_3NH_3PbI_3的可调谐性更大,使钙钛矿太阳能电池在未来大面积应用成为可能。展开更多
Efficient heterojunction organic photovoltaic （OPV） cells are fabricated based on copper tetra-methyl phthalocyanine （CuMePc） as donor and fullerene （C60） as acceptor. The power conversion efficiency of CuMePc/C...Efficient heterojunction organic photovoltaic （OPV） cells are fabricated based on copper tetra-methyl phthalocyanine （CuMePc） as donor and fullerene （C60） as acceptor. The power conversion efficiency of CuMePc/C60 OPV cell （2.52%） is increased by 88% compared with that of the non-peripheral substituted copper phthalocyanine （CuPc）/C60 OPV cell （1.34%）. The introduction of methyl substituent leads to stronger π–π interaction of CuMePc （～ 3.5 ？） than that of CuPc （～ 3.8 ？）. The efficiency improvement is attributed to the enhanced carrier mobility of CuMePc thin film （1.1×10-3 cm2/V·s） and better film morphology by introducing methyl groups into the periphery of CuPc molecule.展开更多
Crystallographic dynamics of blend films of regioregular poly（3-hexylthiophene）（P3HT） mixed with [6-6-]-phenylC61-butyric acid methyl ester（PC61BM） treated by thermal annealing or by adding solvent 1,8-diiodooct...Crystallographic dynamics of blend films of regioregular poly（3-hexylthiophene）（P3HT） mixed with [6-6-]-phenylC61-butyric acid methyl ester（PC61BM） treated by thermal annealing or by adding solvent 1,8-diiodooctane（DIO） are characterized by 2D-grazing incidence x-ray diffraction（2D-GIXRD）. The results show that the P3 HT chains are primarily oriented with the thiophene ring edge-on to the substrate, with a small fraction of chains oriented plane-on. The interplanar spacing becomes narrow after being treated by DIO, and the coherence length of the P3 HT crystallites increases after being treated by thermal annealing or DIO, which is accompanied by a change in the orientation angle of the P3 HT lamellae. The increased ordering of P3 HT packing induced by thermal annealing or adding DIO contributes to enhanced photovoltaic performance.展开更多
Fluorinated and nitrogen-doped graphdiyne(F/N-GDY)have been used in the active layer of perovskite solar cells(PSCs)for the first time.The introduction of heteroatoms turns out to be an effective method for boosted so...Fluorinated and nitrogen-doped graphdiyne(F/N-GDY)have been used in the active layer of perovskite solar cells(PSCs)for the first time.The introduction of heteroatoms turns out to be an effective method for boosted solar cells performance,which increases by 32.8%and 33.0%,better than the pristine or GDY doped PSCs.The enhanced performance can be attributed firstly to the superiority of F/N-GDY originated from the unique structure and optoelectronic properties of GDY.Then,both can further reduce surface defects and improve surface and bulk crystallinity than pristine GDY.What's more,efficiency increase caused by F-GDY is mainly attributed to the improvement of fill factor(FF),while the higher short-circuit current(Jsc)plays more important role by N-GDY doping.Most importantly,the detailed mechanism brought about by doping of F-GDY or N-GDY is expounded by systematical characterizations,especially the synchrotron radiation technique.Doping of F-GDY causes Pb and forms new Pb-F bonds between F-GDY and Pb ions.Doping of N-GDY or GDY brings about Pb(N-GDY doping induces more deviation than that of GDY due to the participation of imine N),improving its electron density and conductivity.展开更多
基金National Natural Science Foundation of China(11405253,U1332205)Youth Innovation Promotion Association CAS and the Research Program of Science and Technology Commission of Shanghai Municipality(14DZ2261200)
文摘为了提高钙钛矿太阳能电池在潮湿环境中的稳定性,采用一步法,通过在DMF中混合(EDA)I_2、(FA)I和Pb I_2,将乙二胺离子引入钙钛矿晶格,成功制备了一种具有较高稳定性的二维片层状的钙钛矿结构薄膜。通过原位掠入射X射线衍射(GIXRD)、X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外–可见吸收光谱(UV-Vis)和原子力显微镜(AFM)等方法检测分析(EDA)(FA)_2[Pb_3I_(10)]在低湿度及高湿度环境下的结构、形貌以及光学性能变化。结果表明:制备的(EDA)(FA)_2[Pb_3I_(10)]薄膜在相同湿度环境下比当前广泛应用于钙钛矿太阳能电池的甲胺铅碘薄膜(CH_3NH_3PbI_3)稳定性更高;薄膜的光学带隙约为1.67 e V,与太阳能电池最佳带隙比较接近。另外,(EDA)(FA)_2[Pb_3I_(10)]薄膜在可见光范围吸光性能较好;薄膜的粗糙度很小,适合制备太阳能电池,而且,成本较硅基太阳能电池低廉,在分子水平较CH_3NH_3PbI_3的可调谐性更大,使钙钛矿太阳能电池在未来大面积应用成为可能。
基金Project supported by the Special Funds for the Development of Strategic Emerging Industries in Shenzhen City,China(Grant No.JCYJ20120830154526537)Start-up Funding of the South University of Science and Technology of China,and the Strategic Research Grant of the City University of Hong Kong(Grant No.7002724)
文摘Efficient heterojunction organic photovoltaic （OPV） cells are fabricated based on copper tetra-methyl phthalocyanine （CuMePc） as donor and fullerene （C60） as acceptor. The power conversion efficiency of CuMePc/C60 OPV cell （2.52%） is increased by 88% compared with that of the non-peripheral substituted copper phthalocyanine （CuPc）/C60 OPV cell （1.34%）. The introduction of methyl substituent leads to stronger π–π interaction of CuMePc （～ 3.5 ？） than that of CuPc （～ 3.8 ？）. The efficiency improvement is attributed to the enhanced carrier mobility of CuMePc thin film （1.1×10-3 cm2/V·s） and better film morphology by introducing methyl groups into the periphery of CuPc molecule.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51272022 and 11474018)the Research Fund for the Doctoral Program of Higher Education of China(Grant No.20120009130005)the Fundamental Research Funds for the Central Universities of China(Grant No.2012JBZ001)
文摘Crystallographic dynamics of blend films of regioregular poly（3-hexylthiophene）（P3HT） mixed with [6-6-]-phenylC61-butyric acid methyl ester（PC61BM） treated by thermal annealing or by adding solvent 1,8-diiodooctane（DIO） are characterized by 2D-grazing incidence x-ray diffraction（2D-GIXRD）. The results show that the P3 HT chains are primarily oriented with the thiophene ring edge-on to the substrate, with a small fraction of chains oriented plane-on. The interplanar spacing becomes narrow after being treated by DIO, and the coherence length of the P3 HT crystallites increases after being treated by thermal annealing or DIO, which is accompanied by a change in the orientation angle of the P3 HT lamellae. The increased ordering of P3 HT packing induced by thermal annealing or adding DIO contributes to enhanced photovoltaic performance.
基金supported financially by the National Key Research and Development Program of China(Nos.2018YFA0703504 and 2017YFA0403403)the National Basic Research Program of China(No.2016YFA0203200)+1 种基金the National Natural Science Foundation of China(Nos.21971242,11705211,and U1532104)Young Scientist Innovative Foundation of IHEP(Nos.E05469U2 and Y95461C).
文摘Fluorinated and nitrogen-doped graphdiyne(F/N-GDY)have been used in the active layer of perovskite solar cells(PSCs)for the first time.The introduction of heteroatoms turns out to be an effective method for boosted solar cells performance,which increases by 32.8%and 33.0%,better than the pristine or GDY doped PSCs.The enhanced performance can be attributed firstly to the superiority of F/N-GDY originated from the unique structure and optoelectronic properties of GDY.Then,both can further reduce surface defects and improve surface and bulk crystallinity than pristine GDY.What's more,efficiency increase caused by F-GDY is mainly attributed to the improvement of fill factor(FF),while the higher short-circuit current(Jsc)plays more important role by N-GDY doping.Most importantly,the detailed mechanism brought about by doping of F-GDY or N-GDY is expounded by systematical characterizations,especially the synchrotron radiation technique.Doping of F-GDY causes Pb and forms new Pb-F bonds between F-GDY and Pb ions.Doping of N-GDY or GDY brings about Pb(N-GDY doping induces more deviation than that of GDY due to the participation of imine N),improving its electron density and conductivity.
