Surface modification of SnO2 photoelectrodes in dye-sensitized solar cells

Significant improvements in photovoltage via Al2O3 atomic layer deposition

Chaiya Prasittichai, Joseph T Hupp

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report here the exploitation of ultrathin layers of Al2O3 deposited via atomic layer deposition (ALD) on SnO2 photoanodes used in dye-sensitized solar cells featuring the I3-/I- couple as the redox electrolyte.We find that a single ALD cycle of Al2O3 increases the lifetimes of injected electrons by more than 2 orders of magnitude. The modified SnO2 photoanode yields nearly a 2-fold improvement fill factor and a greater than 2-fold increase in open-circuit photovoltage, with a slight increase in short-circuit photocurrent. The overall energy conversion efficiency increases by roughly 5-fold. The effects appear to arise primarily from passivation of reactive, low-energy tin-oxide surface states, with bandedge shifts and tunneling based blocking behavior playing only secondary roles.

Original languageEnglish
Title of host publicationACS National Meeting Book of Abstracts
Publication statusPublished - 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

Other

Other241st ACS National Meeting and Exposition
CountryUnited States
CityAnaheim, CA
Period3/27/113/31/11

Fingerprint

Atomic layer deposition
Surface treatment
Surface states
Tin oxides
Photocurrents
Energy conversion
Passivation
Short circuit currents
Electrolytes
Conversion efficiency
Electrons
Networks (circuits)
Dye-sensitized solar cells
Oxidation-Reduction
stannic oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Surface modification of SnO2 photoelectrodes in dye-sensitized solar cells : Significant improvements in photovoltage via Al2O3 atomic layer deposition. / Prasittichai, Chaiya; Hupp, Joseph T.

ACS National Meeting Book of Abstracts. 2011.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Prasittichai, C & Hupp, JT 2011, Surface modification of SnO2 photoelectrodes in dye-sensitized solar cells: Significant improvements in photovoltage via Al2O3 atomic layer deposition. in ACS National Meeting Book of Abstracts. 241st ACS National Meeting and Exposition, Anaheim, CA, United States, 3/27/11.
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