Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117576, Singapore.
Small. 2010 Oct 4;6(19):2176-82. doi: 10.1002/smll.201000759.
Mesoporous nanofibers (NFs) with a high surface area of 112 m(2)/g have been prepared by electrospinning technique. The structures of mesoporous NFs and regular NFs are characterized and compared through scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and selected area electron diffraction (SAED) studies. Using mesoporous TiO(2) NFs as the photoelectrode, solid-state dye-sensitized solar cells (SDSCs) have been fabricated employing D131 as the sensitizer and P3HT as the hole transporting material to yield an energy conversion efficiency (η) of 1.82%. A J(sc) of 3.979 mA cm(-2) is obtained for mesoporous NF-based devices, which is 3-fold higher than that (0.973 mA cm(-2)) for regular NF-based devices fabricated under the same condition (η = 0.42%). Incident photon-to-current conversion efficiency (IPCE) and dye-desorption test demonstrate that the increase in J(sc) is mainly due to greatly improved dye adsorption for mesoporous NFs as compared to that for regular NFs. In addition, intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS) measurements indicate that the mesopores on NF surface have very minor effects on charge transport and collection. Initial aging test proves good stability of the fabricated devices, which indicates the promise of mesoporous NFs as photoelectrode for low-cost SDSCs.
介孔纳米纤维（NFs）具有 112 m²/g 的高比表面积，通过静电纺丝技术制备。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）和选区电子衍射（SAED）研究对介孔 NFs 和常规 NFs 的结构进行了表征和比较。以介孔 TiO2 NF 作为光电极，采用 D131 作为敏化剂，P3HT 作为空穴传输材料，制备了固态染料敏化太阳能电池（SDSCs），能量转换效率（η）为 1.82%。介孔 NF 基器件的 J(sc)为 3.979 mA cm⁻²，是相同条件下常规 NF 基器件（η=0.42%，J(sc)=0.973 mA cm⁻²）的 3 倍。入射光子电流转换效率（IPCE）和染料解吸测试表明，与常规 NF 相比，介孔 NF 对染料的吸附大大提高，是 J(sc)增加的主要原因。此外，强度调制光电流谱（IMPS）和强度调制光电压谱（IMVS）测量表明，NF 表面的介孔对电荷输运和收集几乎没有影响。初始老化测试证明了所制备器件的良好稳定性，这表明介孔 NFs 作为低成本 SDSCs 光电极具有广阔的应用前景。
