Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics

A larger amount of tin precursor was dispersed in electrospun polyvinyl acetate fibers than that required for SnO2 fiber formation upon annealing, thereby creating a constraint such that all nuclei formed during annealing could not be accommodated within the fiber, which leads to enhanced reaction k...

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Main Authors:	Elumalai, Naveen Kumar, Rajan, Jose, Archana, Panikar Sathyaseelan, Chellappan, Vijila, Ramakrishna, Seeram
Format:	Article
Language:	English
Published:	American Chemical Society 2012
Subjects:	Q Science (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/1/Charge%20transport%20through%20electrospun%20SnO%202%20nanoflowers%20and%20nanofiber.pdf

id	ump-27017
recordtype	eprints
spelling	ump-270172020-02-27T08:34:57Z http://umpir.ump.edu.my/id/eprint/27017/ Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics Elumalai, Naveen Kumar Rajan, Jose Archana, Panikar Sathyaseelan Chellappan, Vijila Ramakrishna, Seeram Q Science (General) A larger amount of tin precursor was dispersed in electrospun polyvinyl acetate fibers than that required for SnO2 fiber formation upon annealing, thereby creating a constraint such that all nuclei formed during annealing could not be accommodated within the fiber, which leads to enhanced reaction kinetics and formation of highly crystalline–cum–higher surface area SnO2 flowers. The flowers are shown to have a lower density of surface trap states than fibers by combining absorption spectra and open circuit voltage decay (OCVD) measurements. Charge transport through the SnO2 flowers in the presence of the iodide/triiodide electrolyte was studied by OCVD, electrochemical impedance spectroscopy, and transient photodecay techniques. The study shows that the flowers are characterized by higher chemical capacitance, higher recombination resistance, and lower transport resistance compared with fibers. Photocurrent transients were used to extract the effective electron diffusion coefficient and mobility which were an order of magnitude higher for the flowers than that for the fibers. The flowers are also shown to have an enhanced Fermi energy, on account of which as well as higher electron mobility, dye-sensitized solar cells fabricated using the SnO2 flowers gave VOC ∼700 mV and one of the highest photoelectric conversion efficiencies achieved using pure SnO2. American Chemical Society 2012 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/27017/1/Charge%20transport%20through%20electrospun%20SnO%202%20nanoflowers%20and%20nanofiber.pdf Elumalai, Naveen Kumar and Rajan, Jose and Archana, Panikar Sathyaseelan and Chellappan, Vijila and Ramakrishna, Seeram (2012) Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics. Journal of Physical Chemistry C, 116 (42). pp. 22112-22120. ISSN 1932-7447 (print); 1932-7455 (online) https://doi.org/10.1021/jp304876j https://doi.org/10.1021/jp304876j
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	Q Science (General)
spellingShingle	Q Science (General) Elumalai, Naveen Kumar Rajan, Jose Archana, Panikar Sathyaseelan Chellappan, Vijila Ramakrishna, Seeram Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
description	A larger amount of tin precursor was dispersed in electrospun polyvinyl acetate fibers than that required for SnO2 fiber formation upon annealing, thereby creating a constraint such that all nuclei formed during annealing could not be accommodated within the fiber, which leads to enhanced reaction kinetics and formation of highly crystalline–cum–higher surface area SnO2 flowers. The flowers are shown to have a lower density of surface trap states than fibers by combining absorption spectra and open circuit voltage decay (OCVD) measurements. Charge transport through the SnO2 flowers in the presence of the iodide/triiodide electrolyte was studied by OCVD, electrochemical impedance spectroscopy, and transient photodecay techniques. The study shows that the flowers are characterized by higher chemical capacitance, higher recombination resistance, and lower transport resistance compared with fibers. Photocurrent transients were used to extract the effective electron diffusion coefficient and mobility which were an order of magnitude higher for the flowers than that for the fibers. The flowers are also shown to have an enhanced Fermi energy, on account of which as well as higher electron mobility, dye-sensitized solar cells fabricated using the SnO2 flowers gave VOC ∼700 mV and one of the highest photoelectric conversion efficiencies achieved using pure SnO2.
format	Article
author	Elumalai, Naveen Kumar Rajan, Jose Archana, Panikar Sathyaseelan Chellappan, Vijila Ramakrishna, Seeram
author_facet	Elumalai, Naveen Kumar Rajan, Jose Archana, Panikar Sathyaseelan Chellappan, Vijila Ramakrishna, Seeram
author_sort	Elumalai, Naveen Kumar
title	Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
title_short	Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
title_full	Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
title_fullStr	Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
title_full_unstemmed	Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics
title_sort	charge transport through electrospun sno2 nanoflowers and nanofibers: role of surface trap density on electron transport dynamics
publisher	American Chemical Society
publishDate	2012
url	http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/ http://umpir.ump.edu.my/id/eprint/27017/1/Charge%20transport%20through%20electrospun%20SnO%202%20nanoflowers%20and%20nanofiber.pdf
first_indexed	2023-09-18T22:42:22Z
last_indexed	2023-09-18T22:42:22Z
_version_	1777417000395472896

Charge transport through Electrospun SnO2 Nanoflowers and Nanofibers: Role of surface trap density on electron transport dynamics

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