Microelectronic properties of organic Schottky diodes based on MgPc for solar cell applications

Abstract The magnesium phthalocyanine (MgPc) based Schottky diodes are fabricated using four inorganic semiconductors ( n -GaAs, n -Si, p -InP, p -Si)by the spin-coating process at 2000 rpm for 1 min. Their microelectronic and photoelectrical parameters are investigated from the current-voltage I–V characteristics measurements at room temperature in dark and under light. The ln I–V plots, Cheung and Norde methods are used to extract the MgPc based Schottky diodes parameters in dark, including ideality factor (n), barrier height (Φ b ), series resistance (R s ) and the obtained values are compared. The MgPc/n-Si showed excellent n of 1.1 which is very closer to ideal Schottky diode behavior, high Ф b of 0.98 eV and low series resistance of 237.77 Ω in contrast MgPc/p-Si showed non-ideal Schottky diode behavior with n of 2.42 and high series resistance of 1.92 × 10 3 Ω. The MgPc/p-InP exhibited photovoltaic behavior with excellent J SC of 3.11 × 10 3 mA/cm 2 and a photosensitivity of 30.46. The I–V forward bias in log scale have been investigated to survey the dominated conduction mechanism. This study reviews thecrucial effect of (p and n) type conductivity substrates on the electrical parameters of organic MgPc Schottky diodes for the use in such organic photovoltaic applications.