Premium
Enhancing Device Performance of Small Molecular Organic Photovoltaic Cells by Controlling the Deposition Rate of Fullerene
Author(s) -
Liu ShunWei,
Lee ChihChien,
Su WeiCheng,
Lin ChiFeng,
Chou ChiaChang
Publication year - 2013
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201200118
Subject(s) - chemistry , fullerene , heterojunction , deposition (geology) , organic solar cell , energy conversion efficiency , phthalocyanine , photovoltaic system , chemical engineering , nanotechnology , optoelectronics , materials science , organic chemistry , polymer , paleontology , ecology , sediment , engineering , biology
To improve the power conversion efficiency (PCE) of small molecular weight organic photovoltaic cells (OPVs) it is proposed to use a simple fabrication method by controlling the deposition rate of the acceptor material fullerene (C 60 ) in planar heterojunction OPV structures of ITO/poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate)/copper phthalocyanine (CuPc)/C 60 /bathocuproine (BCP)/Ag. In our optimised device, the highest PCE of 1.7% was obtained through a deposition rate of C60 equal to 0.3 nm/s due to the superior charge balance in the CuPc/C 60 heterojunction. Such a charge balance condition increased the fill factor from 52.4% to 56.1% by reducing the carrier accumulation in the OPV device. The electron only device was fabricated with the purpose of analysing the electron mobility of C 60 as a function of the deposition rate. In addition, the effects of the deposition rates on the performance of planar OPV devices were exhaustively analysed by examining the absorption properties and the surface morphologies.