title: Reversible structural transformation and enhanced performance of PEDOT:PSS-based hybrid solar cells driven by light intensity.
abstract: Hybrid solar cells made of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (
  PSS) and appropriate amounts of a cosolvent and a fluorosurfactant on planar n-type silicon substrates showed a photoconversion efficiency (PCE) of above 13%. These cells also exhibited stable, reproducible, and high external quantum efficiency (EQE) that was not sensitive to light-bias intensity (LBI). In contrast, solar cells made of pristine
  PSS showed low PCE and high EQE only under certain measurement conditions. The EQE was found to degrade with increasing LBI. Here we report that the LBI-sensitive variation of EQE of the low-PCE cells is related to a reversible structural transformation from a quinoid to a benzoid structure of PEDOT.
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Joseph Palathinkal
authors.initials: JP
authors.lastname: Thomas
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Saurabh
authors.initials: S
authors.lastname: Srivastava
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Liyan
authors.initials: L
authors.lastname: Zhao
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Marwa
authors.initials: M
authors.lastname: Abd-Ellah
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Donald
authors.initials: D
authors.lastname: McGillivray
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Jung Soo
authors.initials: JS
authors.lastname: Kang
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Md Anisur
authors.initials: MA
authors.lastname: Rahman
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Nafiseh
authors.initials: N
authors.lastname: Moghimi
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Nina F
authors.initials: NF
authors.lastname: Heinig
authors.affiliation: WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
authors.forename: Kam Tong
authors.initials: KT
authors.lastname: Leung
keywords: PEDOT:PSS; external quantum efficiency; hybrid solar cell; light-bias intensity; structure stabilization