Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/92818
Type: Artigo de periódico
Title: Stepped Light-induced Transient Measurements Of Photocurrent And Voltage In Dye-sensitized Solar Cells Based On Zno And Zno:ga
Author: Gonalves A.D.S.
Davolos M.R.
Masaki N.
Yanagida S.
Mori S.
Nogueira A.F.
Abstract: In order to explain the higher short-circuit current (Jsc) with comparable open-circuit voltage (Voc) from dye-sensitized solar cells (DSCs) based on gallium-modified ZnO (ZnO:Ga) porous electrodes, the diffusion coefficient (D) and electron lifetime (τ) in DSCs with and without Ga-modified ZnO were studied by stepped light-induced transient measurements of photocurrent and voltage. In comparison to DSCs based on ZnO electrodes, the ZnO:Ga-based solar cells provided lower D and higher τ values. The results were interpreted according to the transport-limited recombination model, where the Ga modification induced a higher density of intraband charge traps. At matched electron densities, a decrease in Voc from DSCs based on ZnO:Ga was observed, suggesting a positive shift of the ZnO:Ga conduction band edge. The higher Jsc can be explained by the positive shift of the ZnO:Ga conduction band edge in addition to the increased roughness factor of the electrode due to the Ga modification. © 2009 American Institute of Physics.
Editor: 
Rights: aberto
Identifier DOI: 10.1063/1.3226073
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-70349649342&partnerID=40&md5=9ff51e8f14535e24ff6bdee31d2efd38
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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