Photovoltaic effect of organic devices at low temperature and under high magnetic field

The photocurrent responses of organic MIM junctions were investigated for light chopped at various frequencies in the temperature range between 300 K and 1.5 K. The responses to different chopping frequencies exhibited different temperature dependences. A light-chopped photocurrent markedly decreased under magnetic fields at low temperatures. An experiment of photoinduced charge extraction by linearly increasing voltage (photo-CELIV) was performed at 1.4 K to reveal the origin of this phenomenon. A drastic increase in the lifetime was observed for trapped carriers under applied magnetic field.