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  • Title: Reversible structural transformation and enhanced performance of PEDOT:PSS-based hybrid solar cells driven by light intensity.
    Author: Thomas JP, Srivastava S, Zhao L, Abd-Ellah M, McGillivray D, Kang JS, Rahman MA, Moghimi N, Heinig NF, Leung KT.
    Journal: ACS Appl Mater Interfaces; 2015 Apr 15; 7(14):7466-70. PubMed ID: 25838244.
    Abstract:
    UNLABELLED: 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.
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