Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the t...Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the top of TiO_2 nanorod arrays film(TNAF). In this case, TNAF could supply efficient scattering centers for high light harvesting and direct electrical pathways for fast electron transfer while the THPF could offer porous channels for loading high quantity of previously synthetized quantum dots(QDs) and facilitate the penetration of electrolyte. Meanwhile, in this specific configuration, the presence of anatase–rutile heterojunction at the interface could help the rutile TNAF layer to efficiently collect photo-injected electrons from the anatase THPF layer thus suppressing the recombination of electrons and holes in electrolyte. The results showed that the PCE of QDSSC based on the TNAF photoanode was about 1.4-fold higher(η = 3.05%, J_(sc)= 15.86 m A cm^(-2), V_(oc)= 0.602 V, FF = 0.319) than that of device based on pure THPF(η = 2.20%, J_(sc)= 13.82 m A cm^(-2), V_(oc)= 0.572 V, FF = 0.278).展开更多
光阳极是染料敏化太阳能电池(dye-sensitized solar cells,简称DSSCs)的关键组成部件之一,它具备负载染料和传输电子的能力。ZnO通常作为的光阳极材料之一。本文以Zn(NO_(3))_(2)·6H_(2)O和尿素为原料,采用化学浴沉积法在镀有ZnO...光阳极是染料敏化太阳能电池(dye-sensitized solar cells,简称DSSCs)的关键组成部件之一,它具备负载染料和传输电子的能力。ZnO通常作为的光阳极材料之一。本文以Zn(NO_(3))_(2)·6H_(2)O和尿素为原料,采用化学浴沉积法在镀有ZnO种子层的FTO导电玻璃上制备了ZnO复合光阳极,并组装成DSSCs。主要研究了散射层浓度和浸渍次数等对ZnO复合光阳极和DSSCs电池性能的影响。通过SEM、EIS、J-V以及IPCE测试,对ZnO复合光阳极的表面形貌,物相结构,以及光电性能等参数进行了系统的分析。结果表明:采用1gZnO团聚体粉中加入15mL无水乙醇和去离子水制备的散射层光阳极膜的性能最佳,其光电转化效率(photoelectric conversion efficiency,PCE)为7.01%,开路电压(Open-circuitvoltage,简称Voc)为0.64V,短路电流密度(Short-circuit currentdensity,简称Jsc)为18.23mA/cm^(2),填充因子(Fill factor,简称FF)为0.60。展开更多
基金financially supported by the China Postdoctoral Science Foundation(2015M572210,2016M602376)the National Natural Science Foundation of China(61604110)+1 种基金the Hubei Natural Science Foundation of China(2017CFB291)the Foundation of Wuhan University of Science and Technology(2016XZ002)
文摘Power conversion efficiency(PCE) of quantum dot-sensitized solar cells(QDSSCs) was boosted in a TiO_2 composite film(TCSF) with delicate design in structure where TiO_2 hierarchical porous film(THPF) situated on the top of TiO_2 nanorod arrays film(TNAF). In this case, TNAF could supply efficient scattering centers for high light harvesting and direct electrical pathways for fast electron transfer while the THPF could offer porous channels for loading high quantity of previously synthetized quantum dots(QDs) and facilitate the penetration of electrolyte. Meanwhile, in this specific configuration, the presence of anatase–rutile heterojunction at the interface could help the rutile TNAF layer to efficiently collect photo-injected electrons from the anatase THPF layer thus suppressing the recombination of electrons and holes in electrolyte. The results showed that the PCE of QDSSC based on the TNAF photoanode was about 1.4-fold higher(η = 3.05%, J_(sc)= 15.86 m A cm^(-2), V_(oc)= 0.602 V, FF = 0.319) than that of device based on pure THPF(η = 2.20%, J_(sc)= 13.82 m A cm^(-2), V_(oc)= 0.572 V, FF = 0.278).
