Cu2ZnSnS4 (CZTS) thin films were successfully prepared by sulfurization of ion bean sputtered precursors on soda-lime glass substrate. The single phase of stannite-type structure CZTS films were obtained as revealed i...Cu2ZnSnS4 (CZTS) thin films were successfully prepared by sulfurization of ion bean sputtered precursors on soda-lime glass substrate. The single phase of stannite-type structure CZTS films were obtained as revealed in EDS and XRD analysis when the ratios of the constituents of CZTS thin films are close to stoichiometric by optimizing the conditions of precursor preparation and sulfurization. A low sheet resistivity as about 0.156 Ω·cm and a high absorption coefficient as 1×104 cm-1 were achieved in this method by Hall effect measurements and UV-VIS spectrophotometer. The optical band-gap energy of the CZTS sample is about 1.51 eV, which is very close to the optimum value for a solar-cell absorber.展开更多
In this work,a set of novel Cu2ZnSnS4/Bi2WO6(CZTS/BWO)two-dimensional(2 D)/two-dimensional(2 D)type-Ⅱheterojunctions with different CZTS weight ratios(1%,2%,and 5%)were successfully synthesized via a brief secondary ...In this work,a set of novel Cu2ZnSnS4/Bi2WO6(CZTS/BWO)two-dimensional(2 D)/two-dimensional(2 D)type-Ⅱheterojunctions with different CZTS weight ratios(1%,2%,and 5%)were successfully synthesized via a brief secondary solvothermal process.The successful formation of the heterojunctions was affirmed by characterization methods such as X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy.The photocatalytic activity results showed that the prepared CZTS/BWO heterojunctions had excellent photocatalytic behaviors for organic degradation,especially when the mass fraction of CZTS with respect to BWO in the composite was 2%.Moreover,the addition of hydrogen peroxide(H2O2)could further improve the dye and antibiotic degradation efficiencies.The reinforced photocatalytic and photo-Fenton degradation performance were primarily attributable to the introduction of BWO,which afforded increased active sites,expanded the solar spectral response range,and accelerated the cycle of Cu(Ⅱ)/Cu(Ⅰ);after four cycling times,its catalytic activity did not decrease significantly.In addition,reasonable hypotheses of the photocatalytic and photo-Fenton catalytic mechanisms were formulated.This study is expected to provide a visual approach for designing a novel photo-Fenton catalyst to jointly utilize the photocatalytic and Fenton activities,which can be better applied to the purification of residual organics in wastewater.展开更多
光电化学水分解电池能够将太阳能直接转化为氢能,是一种理想的太阳能利用方式.p-n叠层电池具有理论转换效率高、成本低廉、材料选择灵活等优势,被认为是最具潜力的一类光电化学水分解电池.然而,目前这类叠层电池的太阳能转化效率还不高...光电化学水分解电池能够将太阳能直接转化为氢能,是一种理想的太阳能利用方式.p-n叠层电池具有理论转换效率高、成本低廉、材料选择灵活等优势,被认为是最具潜力的一类光电化学水分解电池.然而,目前这类叠层电池的太阳能转化效率还不高,主要原因是单个电极的效率太低.本文介绍了几种提高光电极分解水性能的方法—减小光生载流子的体相复合、表面复合以及抑制背反应等,同时综述了国内外关于几种p型半导体光阴极的研究进展,如Si、In P、Cu In1-xGaxS(Se)2、Cu2Zn Sn S4等.通过总结,作者提出一种p-Cu2Zn Sn S4(Cu In1-xGaxS(Se)2)/n-Ta3N5(Fe2O3)组装方式,有望获得高效低成本叠层光电化学水分解电池.展开更多
四元化合物半导体铜锌锡硫(Cu2Zn Sn S4,CZTS)由于其四种组成元素在地壳中丰度非常高且安全无毒,因而成本低廉。CZTS作为直接带隙半导体材料,其吸收光谱与太阳辐射光谱匹配性好、光吸收系数高,具有结构与性质可调可控、光电性能优异等优...四元化合物半导体铜锌锡硫(Cu2Zn Sn S4,CZTS)由于其四种组成元素在地壳中丰度非常高且安全无毒,因而成本低廉。CZTS作为直接带隙半导体材料,其吸收光谱与太阳辐射光谱匹配性好、光吸收系数高,具有结构与性质可调可控、光电性能优异等优势,是发展绿色、低成本、高效率和稳定薄膜太阳电池的理想核心材料。近年来,国内外研究者对CZTS的结构与性质、制备工艺、应用尤其是通过结构、成分的调控提高其光电转换效率等方面进行了广泛的研究和探讨。本文对CZTS的结构演变、制备工艺、光电性质与应用等进行综述,重点分析了晶体结构、缺陷、表面与界面、合金化等因素对其光伏性能的影响。同时,对CZTS作为新型能量转换材料在光催化和热电等领域的应用进行了探讨。最后对CZTS目前存在的挑战和今后的研究重点进行总结并展望了将来可能的突破方向。展开更多
基金This work was financially supported by the National Natural Science Foundation (No.10574106), the Science & Technology Plan of Guangdong Province (No.2003C105005) and the Scientific Research Foundation for the Returned Overseas Chinese Scholars of Chinese State Education Ministry (No.(2004)176).
文摘Cu2ZnSnS4 (CZTS) thin films were successfully prepared by sulfurization of ion bean sputtered precursors on soda-lime glass substrate. The single phase of stannite-type structure CZTS films were obtained as revealed in EDS and XRD analysis when the ratios of the constituents of CZTS thin films are close to stoichiometric by optimizing the conditions of precursor preparation and sulfurization. A low sheet resistivity as about 0.156 Ω·cm and a high absorption coefficient as 1×104 cm-1 were achieved in this method by Hall effect measurements and UV-VIS spectrophotometer. The optical band-gap energy of the CZTS sample is about 1.51 eV, which is very close to the optimum value for a solar-cell absorber.
基金supported by the National Natural Science Foundation of China(21663030,21666039)the Open Project of State Key Laboratory of Organic-Inorganic Composites Beijing Key Laboratory,Beijing University of Chemical Technology(oic-201901009)+2 种基金the Project of Science&Technology Office of Shannxi Province(2018TSCXL-NY-02-01,2013K11-08,2013SZS20-P01)Industrial Key Project of Yan’an Science and Technology Bureau(2018KG-04)the Project of Yan’an Science Graduate Innovation Project of Yan’an University(YCX201988)~~
文摘In this work,a set of novel Cu2ZnSnS4/Bi2WO6(CZTS/BWO)two-dimensional(2 D)/two-dimensional(2 D)type-Ⅱheterojunctions with different CZTS weight ratios(1%,2%,and 5%)were successfully synthesized via a brief secondary solvothermal process.The successful formation of the heterojunctions was affirmed by characterization methods such as X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy.The photocatalytic activity results showed that the prepared CZTS/BWO heterojunctions had excellent photocatalytic behaviors for organic degradation,especially when the mass fraction of CZTS with respect to BWO in the composite was 2%.Moreover,the addition of hydrogen peroxide(H2O2)could further improve the dye and antibiotic degradation efficiencies.The reinforced photocatalytic and photo-Fenton degradation performance were primarily attributable to the introduction of BWO,which afforded increased active sites,expanded the solar spectral response range,and accelerated the cycle of Cu(Ⅱ)/Cu(Ⅰ);after four cycling times,its catalytic activity did not decrease significantly.In addition,reasonable hypotheses of the photocatalytic and photo-Fenton catalytic mechanisms were formulated.This study is expected to provide a visual approach for designing a novel photo-Fenton catalyst to jointly utilize the photocatalytic and Fenton activities,which can be better applied to the purification of residual organics in wastewater.
文摘光电化学水分解电池能够将太阳能直接转化为氢能,是一种理想的太阳能利用方式.p-n叠层电池具有理论转换效率高、成本低廉、材料选择灵活等优势,被认为是最具潜力的一类光电化学水分解电池.然而,目前这类叠层电池的太阳能转化效率还不高,主要原因是单个电极的效率太低.本文介绍了几种提高光电极分解水性能的方法—减小光生载流子的体相复合、表面复合以及抑制背反应等,同时综述了国内外关于几种p型半导体光阴极的研究进展,如Si、In P、Cu In1-xGaxS(Se)2、Cu2Zn Sn S4等.通过总结,作者提出一种p-Cu2Zn Sn S4(Cu In1-xGaxS(Se)2)/n-Ta3N5(Fe2O3)组装方式,有望获得高效低成本叠层光电化学水分解电池.
文摘四元化合物半导体铜锌锡硫(Cu2Zn Sn S4,CZTS)由于其四种组成元素在地壳中丰度非常高且安全无毒,因而成本低廉。CZTS作为直接带隙半导体材料,其吸收光谱与太阳辐射光谱匹配性好、光吸收系数高,具有结构与性质可调可控、光电性能优异等优势,是发展绿色、低成本、高效率和稳定薄膜太阳电池的理想核心材料。近年来,国内外研究者对CZTS的结构与性质、制备工艺、应用尤其是通过结构、成分的调控提高其光电转换效率等方面进行了广泛的研究和探讨。本文对CZTS的结构演变、制备工艺、光电性质与应用等进行综述,重点分析了晶体结构、缺陷、表面与界面、合金化等因素对其光伏性能的影响。同时,对CZTS作为新型能量转换材料在光催化和热电等领域的应用进行了探讨。最后对CZTS目前存在的挑战和今后的研究重点进行总结并展望了将来可能的突破方向。
