Self-Organized Films of Carbazole Derivatives on Structured Silicon Substrates for Photovoltaic Applications

New organic molecules based on aryl-substituted carbazoles (RB-14, RB-18, RB-22, RB-24, RB-25, RB-27, RB-70, and RB-75) were used to form organic-inorganic hybrids on Si(100) n-type substrates with a resistivity of 2.7 Ohm*cm, structured by standard technology in acid solution. The aforementioned organic materials are commonly used to make organic LEDs. Here, these materials are used for the first time in a hybrid structure for solar energy conversion. Arylsubstituted carbazole-based films were deposited by spin-coating and self-organization in drops of 1% chloroform solution. The deposition process was carried out in a glove box at room temperature under an inert atmosphere. The layers were deposited at 500 rpm for 15 minutes. The morphological features of the deposited and self-organized films were studied by optical microscopy. Current-voltage characteristics were measured using a standard automated tester and then analyzed by the value of dimensionless sensitivity to recognize charge flow and recombination mechanisms. Two dominant forms of morphology were observed: square-like and network-like, which depend on the substituents of carbazole derivatives. Some hybrids have demonstrated a photoelectric effect. The mechanism of charge flow in the obtained hybridsis is bimolecular recombination. Additionally, the current-voltage characteristics of the obtained hybrids and the substitutional structure of organic compounds based on the substituted carbazole derivatives are discussed.