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Graphene oxide and water‐soluble polymer composite materials as efficient hole transporting layer for high performance organic solar cells
Author(s) -
Oh SeungHwan,
Kim KyuRi,
Yun JinMun,
Kang Phil Hyun
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431595
Subject(s) - graphene , materials science , energy conversion efficiency , alkoxy group , organic solar cell , indium tin oxide , composite number , oxide , layer (electronics) , doping , chemical engineering , polymer , nanotechnology , chemistry , organic chemistry , composite material , optoelectronics , alkyl , engineering , metallurgy
Abstract A blend of (poly[(9,9‐bis((6′‐(N,N,N‐trimethylammonium)hexyl)‐2,7‐fluorene)‐alt‐(9,9‐bis(2‐(2‐(2‐methoxyethoxy) ethoxy)ethyl)‐9‐fluorene))] dibromide (WPF‐6‐oxy‐F) and graphene oxide (GO) is investigated as a hole transporting layer for low‐cost poly[[4,8‐bis[(2‐ethylhexyl)oxy]benzo[1,2‐b:4,5‐b′]dithiophene‐2,6‐diyl][3‐fluoro‐2‐[(2‐ethylhexyl)carbonyl] thieno[3,4‐b]thiophenediyl]] (PTB7): phenyl‐C‐71‐butyric acid methyl ester (PC71BM) organic solar cells (OSCs). The conductivity of the WPF‐6‐oxy‐F and GO composite material is higher than pristine GO by about two orders of magnitude due to efficient packing and p‐doping between WPF‐6‐oxy‐F and GO. The WPF‐6‐oxy‐F‐GO composite is inserted between the indium tin‐oxide (ITO) and the active layer as a hole transporting layer by spin‐coating. The resulting V oc , FF, and power conversion efficiency (PCE) of photovoltaic cells are significantly enhanced. The efficiency of devices with only GO and WPF‐6‐oxy‐F‐GO as a hole‐transporting layer are 3.14 and 6.59%, respectively.