共查询到18条相似文献，搜索用时 46 毫秒
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结合水热法和阳极氧化法合成了Sb2S3/TiO2纳米管异质结阵列,采用场发射扫描电子显微镜、X射线衍射谱表征了异质结阵列的形貌和晶体结构.暗态下的电流-电压曲线表明Sb2S3/TiO2纳米管异质结阵列具有整流效应.相比于纯的TiO2纳米管阵列,Sb2S3/TiO2纳米管异质结阵列的光电性能有了显著地提升:在AM1.5标准光强作用下,光电转换效率从0.07％增长到0.40％,表面光电压响应范围从紫外光区拓宽至可见光区.结合表面光电压谱和相位谱,分析了Sb2S3/TiO2纳米管异质结阵列中光生载流子的分离和传输性能. 相似文献
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相文峰孙睿姚江峰董子斌陈少华赵嵩卿周广刚 《微纳电子技术》2018,(6):397-400
通过液相还原法制备了Cu2O颗粒,利用扫描电子显微镜（SEM）以及X射线衍射（XRD）等手段对粒径的大小、微结构以及组分进行了测试和分析。测试结果表明：Cu2O颗粒为组分单一、表面含有大量孔隙的八面体结构。颗粒的粒径大小并不均匀,分布在几十纳米到1微米之间。同时研究了Cu2O颗粒的吸附特性,发现Cu2O颗粒对甲基橙具有良好的吸附能力。在吸附160min后,甲基橙的吸附率为67．5％,而且其最高吸附率可达94．86％。Cu2O颗粒的吸附性能可能主要来源于颗粒上的孔隙结构。拟合结果表明Cu2O颗粒的吸附过程符合伪一级动力学方程,这说明Cu2O颗粒的吸附机制主要是物理吸附。 相似文献
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采用电化学沉积法在酸性电解液中制备n型Cu2O薄膜,并对其进行Cl掺杂,制备Cu2O-Cl结构.然后利用连续离子吸附法在样品薄膜上复合PbS量子点.通过SEM和UV-vis对样品进行表征,并对样品的光电化学性能进行了测试.结果表明,未掺杂的Cu2O对PbS量子点的吸附能力较强一些,经PbS敏化后的样品在太阳光谱的吸收拓展到了近红外区,PbS/Cu2O和PbS/Cu2O-Cl复合结构的光电化学性能均有所增加,尤其是短路电流密度.PbS复合后的样品转换效率最高仅为0.67％,主要原因是两者能级的不匹配,形成异质结时引入界面态,得不到理想的转换效率. 相似文献
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在酸性溶液中利用恒电位沉积法在导电玻璃(ITO)上沉积Cu2O薄膜,并以KC1为添加剂对其进行掺杂,采用场发射扫描电子显微镜(FESEM)和X射线衍射谱(XRD)等手段研究了氯掺杂对Cu2O表面形貌和晶体结构的影响.紫外-可见吸收光光谱确定得到的Cu2O和Cl掺杂Cu2O(Cu2 O-C1)样品的禁带宽度分别为1.98和1.95 eV.根据表面光电压谱和相位谱,掺杂前后的Cu2O均为n型,Cu2 O-C1有更强的表面光电压响应.场诱导表面光电压谱结果表明未掺杂C1的Cu2O在加负偏压时易形成反型层;氯离子的掺杂引入杂质能级可以提高n型导电性.光电化学性能测试发现,以Cu2O、Cu2 O-Cl为光阳极组成的光化学太阳电池,在大气质量AM 1.5G、100 mW/cm2标准光强作用下光电转换效率分别为0.12％和0.51％. 相似文献
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ZnTe Cu薄膜的制备及其性能 总被引：7，自引：1，他引：6
用共蒸发法在室温下沉积了 Zn Te∶ Cu多晶薄膜 .刚沉积的不掺 Cu的薄膜呈立方相 ,适度掺 Cu时为立方相和六方相的混合相 .随着 Cu含量的增加 ,六方相增加 ,光能隙减小 .根据暗电导温度关系 ,结合 XRD和 DSC的结果 ,认为在 110℃、170℃开始出现类 Cu Te、类 Cu2 Te相以及 Cu0、Cu+离解的结果导致电导温度关系异常 ,应用这种薄膜作为背接触层获得了转换效率为 11.6 % ,面积为 0 .5 2 cm2 的 Cd S/Cd Te/Zn Te∶ Cu太阳电池 相似文献
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采用牺牲模板法和水热法结合的合成路径,将Cu9S5层负载于TiO2纳米管上,制备了性能优良的TiO2纳米管状异质结光催化剂。Cu9S5和TiO2两者之间异质结的形成使得体系的带隙缩小至2.77 eV,相对于纯TiO2显著拓宽了光吸收范围。基于密度泛函理论利用VASP软件计算的差分电荷密度图以及瞬时光电流响应测试表明Cu9S5/TiO2纳米管状异质结光催化剂具有优良的光生载流子分离能力。本工作所合成的Cu9S5/TiO2纳米管状异质结光催化剂可在120 min内去除98%的罗丹明B(RhB,10 mg·L-1)以及99%的盐酸四环素(TCH,30 mg·L-1)。循环光催化降解测试表明Cu9S5/T... 相似文献
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Jinchen Zhou Bo Gao Daofu Wu Changqing Tian Hongmei Ran Wei Chen Qiang Huang Wenxia Zhang Fei Qi Nan Zhang Yayun Pu Jing Qiu Zhiping Hu Juan Du Zhengzheng Liu Yuxin Leng Xiaosheng Tang 《Advanced functional materials》2024,34(3):2308411
In this study, a new type of lead-free double perovskite Cs2TeBr6 combined with metal-free semiconductor g-C3N4 heterojunction is constructed and used for photocatalytic CO2 reduction for the first time. The S-scheme charge transfer mechanism between Cs2TeBr6 and g-C3N4 is systematically verified by X-ray photoelectron spectroscopy (XPS), electron spin resonance (ESR) and in situ Fourier infrared spectroscopy(FT-IR). The formation of S-type heterojunction makes the photocatalyst have higher charge separation ability and highest redox ability. The results show that 5%-CTB/CN heterojunction material has the best photocatalytic reduction effect on CO2 under visible light irradiation. After 3 h of illumination, the yield of CO and CH4 are 468.9 µmol g−1 and 61.31 µmol g−1, respectively. The yield of CO is 1.5 times and 32 times that of pure Cs2TeBr6 and g-C3N4, and the yield of CH4 is doubled compared with pure Cs2TeBr6. However, g-C3N4 almost does not produce CH4, which indicates that the construction of heterojunction helps to further improve the photocatalytic performance of the material. This study provides a new idea for the preparation of Cs2TeBr6/g-C3N4 heterojunction and its effective interfacial charge separation. 相似文献
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采用溶液生成法制备了有机铅卤化钙钛矿(CH3 NH3PbI3)晶体粉末,并以过量的PbI2对其进行掺杂,采用X射线衍射谱(XRD)技术研究了掺杂前后样品的晶体结构变化.表面光电压谱(SPS)和相位谱(PS)显示掺杂前后的CH3 NH3 PbI3均为p型半导体,但后者有更强的光伏响应.场诱导表面光电压谱(FISPS)表明:当加正电场时,掺杂前后的CH3NH3PbI3均表现为p型半导体的载流子特性,当加负偏压时掺杂后的CH3NH3PbI3易形成反型层,出现光伏反转,且外加负偏压越大,光伏反转区域越大,表现出双极导电特性. 相似文献
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复合结构半导体电极在水溶液中的光电行为 总被引：1，自引：1，他引：0
借助于锁相放大技术和其他一些电化学研究方法,探讨了GaAs/Ga1-xAlxAs复合结构半导体材料的光电行为,分别对不同复合结构和同一复合结构、掺杂Al组分不同的半导体材料的开路输出光电压和光电流响应进行了研究。结果表明:采用复合材料代替单一的半导体作光阳极,有助于提高太阳能的光电转换效率,为光电化学太阳能电池的研究开辟了一条新途径。 相似文献
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L. Kronik M. Leibovitch E. Fefer L. Burstein Yoram Shapira 《Journal of Electronic Materials》1995,24(4):379-385
A comprehensive and quantitative method for extracting the important parameters of interface states is presented. The method
is based on wavelength-, intensity-, and time-resolved surface photovoltage spectroscopy, as well as on measurements as a
function of the thickness of an overlayer. Data analysis provides detailed information about interface state properties, including
their energy position and distribution, density, and the transition probabilities, i.e. their thermal and optical cross sections.
It is also possible to distinguish between surface and bulk states, and determine the spatial site of the states in the case
of a heterostructure. Experimental examples for various III-V and II-VI compound semiconductors are given. 相似文献
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Zhiping Zeng Yibo Yan Jie Chen Ping Zan Qinghua Tian Peng Chen 《Advanced functional materials》2019,29(2)
MXene quantum dots (QDs) are emerging 0D nanomaterials. Here, a new heterostructure is developed based on a 1D photoactive semiconductor and a 0D MXene QD for improved photocatalytic reduction of CO2 into methanol. Specifically, Ti3C2 QDs are incorporated onto Cu2O nanowires (NWs) through a simple self‐assembly strategy. It is demonstrated that Ti3C2 QDs not only significantly improve the stability of Cu2O NWs but also greatly improve their photocatatlytic performance by enhancing charge transfer, charge transport, carrier density, light adsorption, as well as by decreasing band bending edge and charge recombination. The energy level diagram derived from both experimental measurements and theoretical calculations provide further insights of such hierarchical photocatalysis system. 相似文献
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Tianyu Zhou Yunchao Ma Hao Feng Ye Lu Guangbo Che Chunbo Liu Yaqian Lan 《Advanced functional materials》2024,34(49):2409396
Covalent organic frameworks (COFs) are a promising class of organic polymers with the merits of robust framework, ultrahigh porosity, and molecularly precise backbones, which reveals great potential for solar-to-chemical energy conversion in the context of mitigating energy and environmental crises. However, the photochemical activities of individual COFs are not as robust as desired, primarily due to their limited light absorption, insufficient dissociation of photogenerated excitons and readily recombined photogenerated carriers. Recently, COFs-based metal-free heterojunctions with synergistic effects provide a feasible route to boost the photocatalytic activity of COFs in more environmentally friendly and cost-competitive manners. Herein, it is first systematically overview the advances in COFs-based metal-free heterojunctions from heterojunction types, heterointerfaces interactions, and primary design mechanisms. Then, typical COFs-based metal-free heterojunction photocatalysts (e.g., g-C3N4-COFs, carbon materials-COFs, polymer semiconductor-COFs, COFs-COFs heterojunction) are summarized. Finally, the challenges and long-term outlooks for future advances of COFs-based metal-free heterojunction photocatalysts are offered from the terms of photocatalytic efficiency, yield, stability, cost and reaction mechanisms, as well as the standardized evaluation method of activities. It is anticipated that this review can deliver new insights into the fundamental and engineering of COFs-based metal-free heterojunctions for solar-to-chemical energy conversion, and further accelerate the development of this area. 相似文献
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Runjie Wu Shuai Gao Colton Jones Mingming Sun Ming Guo Ran Tai Shaowei Chen Qiang Wang 《Advanced functional materials》2024,34(24):2314051
Photocatalytic nitrogen reduction represents a viable technology for green ammonia synthesis under mild conditions. However, the performance of the photocatalysts is typically limited by high charge carrier recombination and low adsorption and activation of nitrogen molecules. Herein, Bi/Bi2Sn2O7 (Bi/BSO) heterojunction nanocomposites are prepared via a one-step hydrothermal method, where NaOH etching of oxygen vacancies in the Bi─O bonds of Bi2Sn2O7 (BSO) is exploited for the in situ formation of metallic Bi and hence Schottky junctions with the semiconducting BSO. This leads to a high separation rate of photogenerated charge carriers. Consequently, compared to the pure-phase BSO, the Bi/BSO heterostructures exhibit markedly enhanced ammonia production, reaching an optimum rate of 284.5 µmol g−1 h−1, where the rectifying contact between the semiconducting BSO and metallic Bi facilitates directional BSO to Bi electron transfer, leading to enrichment of photogenerated electrons at the active sites of metallic Bi. First-principles calculations confirm the alteration of active sites and the guided electron flow by the Schottky junctions and surface oxygen vacancies. Results from this study offer an effective paradigm of structural engineering in manipulating the photocatalytic activity of bismuth-based pyrochlore materials toward nitrogen fixation to ammonia. 相似文献
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Copper migration in cdte heterojunction solar cells 总被引：1，自引：0，他引：1
H. C. Chou A. Rohatgi N. M. Jokerst E. W. Thomas S. Kamra 《Journal of Electronic Materials》1996,25(7):1093-1098
CdTe solar cells were fabricated by depositing a Au/Cu contact with Cu thickness in the range of 50 to 150Å on polycrystalline CdTe/CdS/SnO2/glass structures. The increase in Cu thickness improves ohmic contact and reduces series resistance (Rs), but the excess Cu tends to diffuse into CdTe and lower shunt resistance (Rsh) and cell performance. Light I-V and secondary ion mass spectros-copy (SIMS) measurements were performed to understand the correlations between the Cu contact thickness, the extent of Cu incorporation in the CdTe cells, and its impact on the cell performance. The CdTe/CdS/SnO2/glass, CdTe/ CdS/GaAs, and CdTe/GaAs structures were prepared in an attempt to achieve CdTe films with different degrees of crystallinity and grain size. A large grain polycrystalline CdTe thin film solar cell was obtained for the first time by selective etching the GaAs substrate coupled with the film transfer onto a glass substrate. SIMS measurement showed that poor crystallinity and smaller grain size of the CdTe film promotes Cu diffusion and decreases the cell performance. Therefore, grain boundaries are the main conduits for Cu migration and larger CdTe grain size or alternate method of contact formation can mitigate the adverse effect of Cu and improve the cell performance. 相似文献