The electrical characterization of Ag/N-BuHHPDI/p-Si heterojunction by current-voltage characteristics

摘要

This paper reports the fabrication of Ag/N-BuHHPDI/p-Si heterojunction diode by evaporating a layer of organic compound N-Butyl-N'-(6-hydroxyhexyl) perylene-3,4,9,10-tetracarboxylicacid-diimide (N-BuHHPDI) on top of the p-Si. The electronic properties of the heterojunction have been studied, in dark at a temperature of 300 K, by conventional current-voltage (I-V) method, Norde's method and Cheung's technique. By analyzing conventional I-V characteristics, the device exhibited rectifying behavior with a rectification ratio of 62.67 at ± 5.8 V. From the forward biased I-V measurements, the barrier height and ideality factor values of 0.83 eV and 6.4, respectively, have been obtained. Different diode parameters such as series resistance, shunt resistance, reverse saturation current and turn on voltage have been extracted from the I-V measurements. The parameters calculated from Norde's and Cheung's methods are found to be in good agreement with those calculated from conventional I-V measurements. Morphology of the N-BuHHPDI film is investigated using atomic force microscope (AFM).