Coating effect of electrospun nanofibers of Nb-doped TiO₂ mixed in photoelectrode of dye sensitized solar cells

Abstract

Electrospun nanofibers (NFs) of Nb doped TiO 2 (TNO) were added as a conductive agent to TiO 2 mesoporous layer in dye sensitized solar cells. In order to improve the mobility of carriers in NFs by reducing the barrier at grain boundaries among constituent nanoparticles in NFs, the surface of TNO-NFs was coated with a thin TNO layer by pulsed laser deposition with changing the deposition time t d . It was found that the inter-grain space was filled first at t d : 5 min, and the diffusion velocity v D of carriers was increased by more than 10 times. Since J sc showed an increase of >15% while v D and the electron lifetime τ e decreased at t d > 10 min, the carrier injection from dye/TiO 2 nanoparticles to TNO-NFs was considered to be promoted.

Hierarchical electrospun nanofibers for energy harvesting, production and environmental remediation

“…Horie et al reported Nb-doped electrospun TiO 2 (TNO) NFs as a conductive agent in a mesoporous TiO 2 layer. 108 The coating of TNO NFs exhibited an efficiency (h) increase from 4.8 to 5.8%. This increase was mainly attributed to the increase in J sc by $15% from 9.7 to 11.2 mA cm À2 .…”

Using aligned poly(3-hexylthiophene)/poly(methyl methacrylate) blend fibers to detect volatile organic compounds

“…In contrast, the versatile electrospinning technique is a simple method that is applicable to various materials for the generation of relatively large-scale continuous electrospun fibers. [13][14][15][16][17][18] In our previous work, we fabricated a film as a sensing material with randomly collected poly(3-hexylthiophene) (P3HT)=poly(methyl methacrylate) (PMMA) electrospun fibers. The P3HT=PMMA fibrous film exhibited acceptable sensing capability for VOCs and repeatability.…”