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Organic/inorganic hybrid photovoltaic cells based on substitutionally doped single wall carbon nanotubes

V. Saini, Z. Li, S. Bourdo, V.P. Kunets, S. Trigwell, V. Nteziyaremye, B. Clark, A.R. Biris, G.J. Salamo, T. Viswanathan, A.S. Biris
University of Arkansas at Little Rock, US

Keywords: solar cells, organic-inorganic, carbon nanotube doping, p-type single wall carbon nanotubes, n- type silicon


A simple, novel and easily processible photovoltaic device has been developed based on boron-doped single-walled carbon nanotubes (BSWNTs) and n-type silicon (n-Si) heterojunctions. The single-walled carbon nanotubes (SWNTs) were substitutionally doped with boron atoms by thermal annealing, in the presence of B2O3. The samples used for these studies were characterized by Raman spectroscopy, thermal gravimetric analysis (TGA), transmission electron microscopy (TEM), and x-ray photoelectron spectroscopy (XPS). The fully functional solar cell devices were fabricated by airbrush deposition that generated uniform B-SWNT films on top of the n-Si substrates. The BSWNTs film acted as exciton-generation sites, charge collection and transportation, while the heterojunctions formed between B-SWNTs and n-Si acted as charge dissociation centers. The current-voltage characteristics in the absence of light and under illumination, as well as optical transmittance spectrum are reported here. It should be noted that the device fabrication process can be made amenable to scalability by depositing direct and uniform films using airbrushing, inkjet printing, or spin-coating techniques.
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