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Published on: March 2, 2021
Reversible structural transformation and enhanced performance of PEDOT:PSS-based hybrid solar cells driven by light
Joseph Palathinkal Thomas1, Saurabh Srivastava1, Liyan Zhao1
1WATLab and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada.
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.
