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Reversible Structural Transformation and Enhanced Performance of PEDOT:PSS-Based Hybrid Solar Cells Driven by Light Intensity

Author:
Thomas, Joseph Palathinkal, Srivastava, Saurabh, Zhao, Liyan, Abd-Ellah, Marwa, McGillivray, Donald, Kang, Jung Soo, Rahman, Md. Anisur, Moghimi, Nafiseh, Heinig, Nina F., Leung, Kam Tong
Source:
ACS applied materials 2015 v.7 no.14 pp. 7466-7470
ISSN:
1944-8252
Subject:
light intensity, photovoltaic cells, silicon
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.
Agid:
5282593