In this paper,we present a facile approach to enhance the efficiency and stability of perovskite solar cells(PSCs)by incorporating perovskite with microporous indium-based metal–organic framework[In12O(OH)16(H2O)5(bt...In this paper,we present a facile approach to enhance the efficiency and stability of perovskite solar cells(PSCs)by incorporating perovskite with microporous indium-based metal–organic framework[In12O(OH)16(H2O)5(btc)6]n(In-BTC)nanocrystals and forming heterojunction light-harvesting layer.The interconnected micropores and terminal oxygen sites of In-BTC allow the preferential crystallization of perovskite inside the regular cavities,endowing the derived films with improved morphology/crystallinity and reduced grain boundaries/defects.Consequently,the In-BTC-modified PSC yields enhanced fill factor of 0.79 and power conversion efficiency(PCE)of 20.87%,surpassing the pristine device(0.76 and 19.52%,respectively).More importantly,over 80%of the original PCE is retained after 12 days of exposure to ambient environment(25°C and relative humidity of^65%)without encapsulation,while only about 35%is left to the pristine device.展开更多
Deep-level defects and random oriented configuration in perovskite crystallization process would cause the nonradiative recombination and further affect the performance of perovskite solar cells(PSCs).Herein,two metal...Deep-level defects and random oriented configuration in perovskite crystallization process would cause the nonradiative recombination and further affect the performance of perovskite solar cells(PSCs).Herein,two metal-organic frameworks(MOFs)with tunable Lewis-base passivation sites have been constructed(Cd-Httb and Cd-Httb-BDC,Httb=5-(4-(1H-1,2,4-triazole-1-yl)benzyl)-1h-tetrazole,BDC=1,4-dicarboxybenzene)to eliminate deep-level defects and simultaneously as nanostructured heterogeneous nucleation seed to assist the growth of large-grained perovskite films.Compared with the control and Cd-Httb,Cd-Httb-BDC designed with mix-ligands strategy exhibited the enhanced inducted effect on the crystallization and nucleation of high-quality perovskite films during annealing process.Consequently,the resultant Cd-Httb-BDC-modified device achieved higher power conversion efficiency(PCE)(22.18%)than the control(20.89%)and Cd-Httb(21.56%).Meanwhile,the unencapsulated Cd-Httb-BDC-modified device still maintained 90%of initial PCE after 1500 h in ambient conditions and exhibited enhanced thermal stability(85℃ in N_(2) atmosphere).This work presented a successful example of mixligands strategy on construction of high-quality MOF-assisted perovskite films for high-efficient and stable PSCs.展开更多
A novel electron acceptor, namely, tetra-phthalimide end-fused bifluorenylidene(3 D-imide) was designed and synthesized. In comparison to its framework analogue 12,12'-bidibenzo[b,h]fluorenylidene(BF-3), the elect...A novel electron acceptor, namely, tetra-phthalimide end-fused bifluorenylidene(3 D-imide) was designed and synthesized. In comparison to its framework analogue 12,12'-bidibenzo[b,h]fluorenylidene(BF-3), the electron withdrawing capability and optical absorption were strengthened and enlarged,respectively. Moreover, photoluminescence quenching experiments were carried out, which confirmed 3D-imide could be a good candidate for nonfullene organic photovoltaics. Finally, we gained more insight into its electronic properties through density functional theory calculation.展开更多
A novel air-stable n-type benzothiaphene endcapped azaarene(BTPQ) and its sulfonated derivative(BSPQ) were prepared via two pathways and characterized by NMR, UV–vis, fluorescence and cyclic voltammetry spectroscopy....A novel air-stable n-type benzothiaphene endcapped azaarene(BTPQ) and its sulfonated derivative(BSPQ) were prepared via two pathways and characterized by NMR, UV–vis, fluorescence and cyclic voltammetry spectroscopy. Symmetrically introducing four nitrogen atoms into acenes, the semiconductor properties could be changed from p-type to n-type detected through the space charge limited current(SCLC) method. After sulfonation of BTPQ, BSPQ is with deeper frontier orbital energy levels and enhanced the electron mobility.展开更多
In order to enhance the performance of the dye-sensitized solar cells(DSSCs),graphene oxide(GO)was introduced into the TiO_(2) photoanode to construct a GO-TiO_(2) composited photoanode.The photoelectric properties of...In order to enhance the performance of the dye-sensitized solar cells(DSSCs),graphene oxide(GO)was introduced into the TiO_(2) photoanode to construct a GO-TiO_(2) composited photoanode.The photoelectric properties of the as-constructed photoanode were studied in comparison with those of the TiO_(2) photoanode and the effect of GO obtained by different methods on the performance of the GO-TiO_(2) composited photoanode was also compared.After constructed with GO,the photoanode displayed enhanced light and dye adsorption properties with a higher light harvesting efficiency,lower internal resistances,a faster electron transport,and a lower charge recombination rate,which resulted in a higher current density.At the optimal condition,the DSSCs based on the photoanode modified by GO obtained in our laboratory(GO1)exhibited a J_(sc) of 18.16 mA cm^(-2),a V_(oc) of 0.68 V,and a FF of 0.59 with a energy conversion efficiency(η)of 7.30%,indicating an increased performance compared with that of the DSSCs based only on the pure TiO_(2) photoanode,which had a J_(sc) of 14.41 mA cm^(-2),a V_(oc) of 0.66 V,and a FF of 0.60 with aηvalue of 5.67%.However,when GO that obtained from a production line in a factory(GO_(2))was used,the performance of the DSSCs was further improved,which showed a J_(sc) of 19.49 mA cm^(-2),a V_(oc) of 0.68 V,and an FF of 0.59 with aηvalue of 7.83%.Different performances between GOs that obtained from the laboratory and the factory were mainly attributed to their distinct production processes,which distinguished their properties from each other.It is a potential method to enhance the performance of the DSSCs by constructing a GO-TiO_(2) photoanode with a suitable quality GO.展开更多
Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN...Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN·2H_(2)O}(2)(2-Hqlca=2-quinolinecarboxylic acid)have been synthesized and characterized.Both the In(III)compounds are driven by noncovalent interactions to assemble into supramolecular metal–organic frameworks(MOFs).展开更多
基金National Natural Science Foundation of China(Grant No.21873025 and 21571042).
文摘In this paper,we present a facile approach to enhance the efficiency and stability of perovskite solar cells(PSCs)by incorporating perovskite with microporous indium-based metal–organic framework[In12O(OH)16(H2O)5(btc)6]n(In-BTC)nanocrystals and forming heterojunction light-harvesting layer.The interconnected micropores and terminal oxygen sites of In-BTC allow the preferential crystallization of perovskite inside the regular cavities,endowing the derived films with improved morphology/crystallinity and reduced grain boundaries/defects.Consequently,the In-BTC-modified PSC yields enhanced fill factor of 0.79 and power conversion efficiency(PCE)of 20.87%,surpassing the pristine device(0.76 and 19.52%,respectively).More importantly,over 80%of the original PCE is retained after 12 days of exposure to ambient environment(25°C and relative humidity of^65%)without encapsulation,while only about 35%is left to the pristine device.
基金supported by the National Natural Science Foundation of China(22072034,22001050,and 21873025)the China Postdoctoral Science Foundation(2020T130147,2020M681084,and 2022M710949)+1 种基金the Postdoctoral Foundation of Heilongjiang Province(LBH-Z19059)the Natural Science Foundation of Heilongjiang Youth Fund(YQ2021B002).
文摘Deep-level defects and random oriented configuration in perovskite crystallization process would cause the nonradiative recombination and further affect the performance of perovskite solar cells(PSCs).Herein,two metal-organic frameworks(MOFs)with tunable Lewis-base passivation sites have been constructed(Cd-Httb and Cd-Httb-BDC,Httb=5-(4-(1H-1,2,4-triazole-1-yl)benzyl)-1h-tetrazole,BDC=1,4-dicarboxybenzene)to eliminate deep-level defects and simultaneously as nanostructured heterogeneous nucleation seed to assist the growth of large-grained perovskite films.Compared with the control and Cd-Httb,Cd-Httb-BDC designed with mix-ligands strategy exhibited the enhanced inducted effect on the crystallization and nucleation of high-quality perovskite films during annealing process.Consequently,the resultant Cd-Httb-BDC-modified device achieved higher power conversion efficiency(PCE)(22.18%)than the control(20.89%)and Cd-Httb(21.56%).Meanwhile,the unencapsulated Cd-Httb-BDC-modified device still maintained 90%of initial PCE after 1500 h in ambient conditions and exhibited enhanced thermal stability(85℃ in N_(2) atmosphere).This work presented a successful example of mixligands strategy on construction of high-quality MOF-assisted perovskite films for high-efficient and stable PSCs.
基金supported by National Natural Science Foundation of China (No. 51603055)
文摘A novel electron acceptor, namely, tetra-phthalimide end-fused bifluorenylidene(3 D-imide) was designed and synthesized. In comparison to its framework analogue 12,12'-bidibenzo[b,h]fluorenylidene(BF-3), the electron withdrawing capability and optical absorption were strengthened and enlarged,respectively. Moreover, photoluminescence quenching experiments were carried out, which confirmed 3D-imide could be a good candidate for nonfullene organic photovoltaics. Finally, we gained more insight into its electronic properties through density functional theory calculation.
基金supported by Natural Science Foundation of Heilongjiang Youth Fund (No. YQ2021B002)Heilongjiang Postdoctoral Scientific Research Developmental Fund (No. LBH-Q20018)State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology)。
文摘A novel air-stable n-type benzothiaphene endcapped azaarene(BTPQ) and its sulfonated derivative(BSPQ) were prepared via two pathways and characterized by NMR, UV–vis, fluorescence and cyclic voltammetry spectroscopy. Symmetrically introducing four nitrogen atoms into acenes, the semiconductor properties could be changed from p-type to n-type detected through the space charge limited current(SCLC) method. After sulfonation of BTPQ, BSPQ is with deeper frontier orbital energy levels and enhanced the electron mobility.
基金supported by National Natural Science Foundation of China(Grant 21571042,21371040,61705063,and 21203058)the Science Foundation for Youths of Heilongjiang Province of China(Grant No.QC2016013)+2 种基金the Foundation of Educational Commission of Heilongjiang Province of China(No.12531579)the Innovative Talents Program of Heilongjiang University of Science and Technology(Q20130202)the Postdoctoral Foundation of Heilongjiang Province of China(LBH-Z16203).
文摘In order to enhance the performance of the dye-sensitized solar cells(DSSCs),graphene oxide(GO)was introduced into the TiO_(2) photoanode to construct a GO-TiO_(2) composited photoanode.The photoelectric properties of the as-constructed photoanode were studied in comparison with those of the TiO_(2) photoanode and the effect of GO obtained by different methods on the performance of the GO-TiO_(2) composited photoanode was also compared.After constructed with GO,the photoanode displayed enhanced light and dye adsorption properties with a higher light harvesting efficiency,lower internal resistances,a faster electron transport,and a lower charge recombination rate,which resulted in a higher current density.At the optimal condition,the DSSCs based on the photoanode modified by GO obtained in our laboratory(GO1)exhibited a J_(sc) of 18.16 mA cm^(-2),a V_(oc) of 0.68 V,and a FF of 0.59 with a energy conversion efficiency(η)of 7.30%,indicating an increased performance compared with that of the DSSCs based only on the pure TiO_(2) photoanode,which had a J_(sc) of 14.41 mA cm^(-2),a V_(oc) of 0.66 V,and a FF of 0.60 with aηvalue of 5.67%.However,when GO that obtained from a production line in a factory(GO_(2))was used,the performance of the DSSCs was further improved,which showed a J_(sc) of 19.49 mA cm^(-2),a V_(oc) of 0.68 V,and an FF of 0.59 with aηvalue of 7.83%.Different performances between GOs that obtained from the laboratory and the factory were mainly attributed to their distinct production processes,which distinguished their properties from each other.It is a potential method to enhance the performance of the DSSCs by constructing a GO-TiO_(2) photoanode with a suitable quality GO.
基金supported by the National Natural Science Foundation of China(Grant 21371040 and 21571042)the National Key Basic Research Program of China(973 Program,No.2013CB632900).
文摘Under self-assembly,a novel polydentate benzimidazole ligand 2-(quinoline-2-yl)-benzimidazole(2-QLBM)and two In(III)compounds,[In(2-Hqlca)_(2)Cl_(3)·3H_(2)O](1)and{[In(2-QLBM)(2-qlca)Cl_(2)]_(2)·CH_(3)CN·2H_(2)O}(2)(2-Hqlca=2-quinolinecarboxylic acid)have been synthesized and characterized.Both the In(III)compounds are driven by noncovalent interactions to assemble into supramolecular metal–organic frameworks(MOFs).
