Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Electronic transport properties aspects and structure of polymer-fullerene based organic semiconductors for photovoltaic devices
AU - Adamopoulos, George
AU - Heiser, T.
AU - Giovanella, U.
AU - Ould-Saad, S.
AU - van de Wetering, K.I.
AU - Brochon, C.
AU - Zorba, T.
AU - Paraskevopoulos, K.M.
AU - Hadziioannou, G.
PY - 2006
Y1 - 2006
N2 - A series of polystyrene (PS) and fullerene (C60) based thin films containing from 23 to 60 wt.% in fullerene were investigated. Initially, the films were characterised by Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy where the characteristic absorption bands of both the fullerene and the polystyrene were revealed. The additional characteristic absorption bands due the grafted fullerene to polystyrene were revealed as well. The relative peak intensities provided with qualitative information of the films stoichiometry in terms of the fullerene's amount that was grafted to polystyrene. The optical properties of the films were investigated by spectroscopic ellipsometry (SE). It was found that the increase of the fullerene's amount that was grafted to polystyrene results in an increase of the absorption coefficient α, refractive index n, extinction coefficient k as well as in the dielectric constant ε∝ within the range between 2.4 and 2.8 for the lower and higher fullerene content, respectively. The films' J–V characteristics, of the space charge limited current (SCLC) behaviour, showed increased currents with increasing the fullerene's content. The electron mobility was extracted and found to increase with increasing the fullerene amount, from 4 × 10− 9 cm2/V s to 2 × 10− 7 cm2/V s.
AB - A series of polystyrene (PS) and fullerene (C60) based thin films containing from 23 to 60 wt.% in fullerene were investigated. Initially, the films were characterised by Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy where the characteristic absorption bands of both the fullerene and the polystyrene were revealed. The additional characteristic absorption bands due the grafted fullerene to polystyrene were revealed as well. The relative peak intensities provided with qualitative information of the films stoichiometry in terms of the fullerene's amount that was grafted to polystyrene. The optical properties of the films were investigated by spectroscopic ellipsometry (SE). It was found that the increase of the fullerene's amount that was grafted to polystyrene results in an increase of the absorption coefficient α, refractive index n, extinction coefficient k as well as in the dielectric constant ε∝ within the range between 2.4 and 2.8 for the lower and higher fullerene content, respectively. The films' J–V characteristics, of the space charge limited current (SCLC) behaviour, showed increased currents with increasing the fullerene's content. The electron mobility was extracted and found to increase with increasing the fullerene amount, from 4 × 10− 9 cm2/V s to 2 × 10− 7 cm2/V s.
KW - Fullerene derivatives
KW - Spectroscopic ellipsometry
KW - FTIR
KW - Space charge limited current
U2 - 10.1016/j.tsf.2005.12.029
DO - 10.1016/j.tsf.2005.12.029
M3 - Journal article
VL - 511-512
SP - 371
EP - 376
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
ER -