Fig. 3: Analysis of sub-bandgap density of states (DOS) via capacitance vs. frequency measurements.
From: Noise and detectivity limits in organic shortwave infrared photodiodes with low disorder
a–c Variable-temperature measurements of capacitance versus frequency on the organic photodiodes. Each plot has six shadings to represent data taken at different temperatures, i.e., 40, 30, 20, 10, 0, and −6 °C. The solid lines are fits to determine the density of states (DOS). d–f DOS near the band edge. For the solid lines, the shading indicates the measurement temperature: dark = 40 °C; medium = 20 °C; light = −6 °C. The dashed lines are fits to the exponential bandtails, and the ΔE slope is the bandtail disorder spread.
