Enhancement of carrier-collection by electrospun Nb-doped TiO $$_2$$ 2 nanofiber-network in photoelectrode of dye-sensitized solar cells

Enhancement of carrier-collection by electrospun Nb-doped TiO $$_2$$ 2 nanofiber-network... Conductive nanofiber(NF)-network in nano scale is expected to act as a collector of excited carriers in a medium with short diffusion length of carriers. For the effective usage of conductive NF-network in mesoporous media, we tried to actualize the composite structure of electrospun NF-network of Nb-doped TiO $$_2$$ 2 (TNO) in a mesoporous TiO $$_2$$ 2 layer keeping the network and its direct connection to conductive substrate. The effects of inserted NF-network with different mesh size were examined for the performance of dye-sensitized solar cells. By the insertion of NF-network, the power conversion efficiency $$\eta$$ η was increased by 29.3% resulting from the increase of the short circuit current density $$J_\text{sc}$$ J sc by 31.3%. From the time-resolved spectra of photovoltage and photocurrent, and electrochemical impedance spectra, it was found that photoelectrodes with NF-network had long lifetime of the electrons $$\tau _\text{e}$$ τ e , small recombination rate of electrons $$k_\text{eff}$$ k eff , and large steady state electron density $$n_\text{s}$$ n s . The enhancement of photocurrent and the external quantum efficiency also shows that TNO NF-network acts as a good carrier collector with the low leakage rate of photoexcited carriers. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science: Materials in Electronics Springer Journals

Enhancement of carrier-collection by electrospun Nb-doped TiO $$_2$$ 2 nanofiber-network in photoelectrode of dye-sensitized solar cells

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media New York
Subject
Materials Science; Optical and Electronic Materials; Characterization and Evaluation of Materials
ISSN
0957-4522
eISSN
1573-482X
D.O.I.
10.1007/s10854-017-7141-x
Publisher site
See Article on Publisher Site

Abstract

Conductive nanofiber(NF)-network in nano scale is expected to act as a collector of excited carriers in a medium with short diffusion length of carriers. For the effective usage of conductive NF-network in mesoporous media, we tried to actualize the composite structure of electrospun NF-network of Nb-doped TiO $$_2$$ 2 (TNO) in a mesoporous TiO $$_2$$ 2 layer keeping the network and its direct connection to conductive substrate. The effects of inserted NF-network with different mesh size were examined for the performance of dye-sensitized solar cells. By the insertion of NF-network, the power conversion efficiency $$\eta$$ η was increased by 29.3% resulting from the increase of the short circuit current density $$J_\text{sc}$$ J sc by 31.3%. From the time-resolved spectra of photovoltage and photocurrent, and electrochemical impedance spectra, it was found that photoelectrodes with NF-network had long lifetime of the electrons $$\tau _\text{e}$$ τ e , small recombination rate of electrons $$k_\text{eff}$$ k eff , and large steady state electron density $$n_\text{s}$$ n s . The enhancement of photocurrent and the external quantum efficiency also shows that TNO NF-network acts as a good carrier collector with the low leakage rate of photoexcited carriers.

Journal

Journal of Materials Science: Materials in ElectronicsSpringer Journals

Published: May 23, 2017

References

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