Reversible structural transformation and enhanced performance of PEDOT:PSS-based hybrid solar cells driven by light intensity

Joseph Palathinkal Thomas, Saurabh Srivastava, Liyan Zhao, Marwa Abd-Ellah, Donald McGillivray, Jung Soo Kang, Md Anisur Rahman, Nafiseh Moghimi, Nina F. Heinig, Kam Tong Leung

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Hybrid solar cells made of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT: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 PEDOT: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.

Original languageBritish English
Pages (from-to)7466-7470
Number of pages5
JournalACS Applied Materials and Interfaces
Volume7
Issue number14
DOIs
StatePublished - 15 Apr 2015

Keywords

  • external quantum efficiency
  • hybrid solar cell
  • light-bias intensity
  • PEDOT:PSS
  • structure stabilization

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