H. Antoniadis et al., PHOTOVOLTAIC AND PHOTOCONDUCTIVE PROPERTIES OF ALUMINUM POLY(P-PHENYLENE VINYLENE) INTERFACES, Synthetic metals, 62(3), 1994, pp. 265-271
Photoconductive and photovoltaic properties of Al/PPV/ITO sandwich dev
ices were investigated by measuring steady-state photocurrents resulti
ng from illumination through the Al electrode. A built-in potential (V
(bi)) was detected at the Al/PPV interface. The voltage dependence of
the photocurrent in the vicinity of V(bi) was measured at 1 mW/cm2 of
incident illumination to give an open-circuit voltage and a short-circ
uit current of 1.2 V and 6 x 10(-7) A/cm2, respectively. The dependenc
es of the short-circuit current on excitation wavelength and illuminat
ion intensity are presented and the C-V characteristics of the Al/PPV
interface are analyzed. The quantum collection efficiency decreased fr
om 5% to 1% as the intensity of illumination increased from 10(-5) to
1 mW/cm2. The photovoltaic conversion power efficiency was about 0.07%
for intensities approaching 1 mW/cm2. The V(bi) value was accounted f
or by surface band-bending at the Al/PPV interface.