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Electrical properties of polymer photovoltaic cells using pentacene‐doped PEDOT: PSS as a hole conducting layer
Author(s) -
Kim Hyunsoo,
Chandran Midhun,
Park Sujin,
Chae Hyunhee,
Lee Jungrae,
Choe Youngson
Publication year - 2012
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.4988
Subject(s) - pedot:pss , pentacene , materials science , doping , dopant , work function , conductive polymer , optoelectronics , layer (electronics) , polymer , active layer , substrate (aquarium) , chemical engineering , nanotechnology , composite material , thin film transistor , engineering , oceanography , geology
The performance characteristics of polymer photovoltaic cells, in which the pentacene‐doped PEDOT:PSS thin films are used as a hole conducting layer, have been investigated and characterized by employing AFM, SEM, UV‐visible, work function and current density‐voltage analysis. Pentacene‐doped PEDOT:PSS was prepared by blending pentacene with 1‐methy1‐2‐pyrrolidinone (NMP) and PEDOT:PSS in solution. By using NMP as a solvent, pentacene as a dopant was introduced into PEDOT:PSS films. The surface roughness of PEDOT:PSS films was increased, and aggregate boundaries were clearly distinguished. Pentacene might form aggregations with PEDOT:PSS during the film forming process. UV‐visible transmission intensity also increased as doping percent of pentacene increased. The work function of pentacene‐doped PEDOT:PSS film decreased by approximately 0.3 eV, and this may contribute to moving holes easily toward ITO substrate. Consequently, pentacene‐doped PEDOT:PSS film as a hole conducting layer leads to improving the performance characteristics of photovoltaic cells. Copyright © 2012 John Wiley & Sons, Ltd.