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In this work, Zn O nanorod arrays grown by an electrochemical deposition method are investigated. The crucial parameters of length, diameter, and density of the nanorods are optimized over the synthesize process and nanorods growth time. Crystalline structure, morphologies, and optical properties of Zn O nanorod arrays are studied by different techniques such as x-ray diffraction, scanning electron microscope, atomic force microscope, and UV–visible transmission spectra.The Zn O nanorod arrays are employed in an inverted bulk heterojunction organic solar cell of Poly(3-hexylthiophene):[6-6] Phenyl-(6) butyric acid methyl ester to introduce more surface contact between the electron transporter layer and the active layer. Our results show that the deposition time is a very important factor to achieve the aligned and uniform Zn O nanorods with suitable surface density which is required for effective infiltration of active area into the Zn O nanorod spacing and make a maximum interfacial surface contact for electron collection, as overgrowing causes nanorods to be too dense and thick and results in high resistance and lower visible light transmittance. By optimizing the thickness of the active layer on top of Zn O nanorods, an improved efficiency of 3.17% with a high FF beyond 60% was achieved.
In this work, Zn O nanorod arrays grown by an electrochemical deposition method are investigated. The crucial parameters of length, diameter, and density of the nanorods are optimized over the synthesizing process and nanorods growth time. Crystalline structure, morphologies, and optical properties of Zn O nanorod arrays are studied by different techniques such as x-ray diffraction, scanning electron microscope, atomic force microscope, and UV-visible transmission spectra. The Zn O nanorod arrays are employed in an inverted bulk heterojunction organic solar cell of Poly (3 -hexylthiophene: [6-6] Phenyl- (6) butyric acid methyl ester to introduce more surface contact between the electron transporter layer and the active layer. Our results show that the deposition time is a very important factor to achieve the aligned and uniform Zn O nanorods with suitable surface density which is required for effective infiltration of active area into the Zn O nanorod spacing and make a maximum interfacial surface contact for electron collection, as overgrowing causes nanorods to be too dense and thick and results in high resistance and lower visible light transmittance. By optimizing the thickness of the active layer on top of Zn O nanorods, an improved efficiency of 3.17% with a high FF beyond 60% was achieved.