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a A schematic diagram of TiOx-coated carbon nanotube (CNT) networks as an electron transport layer in an inverted organic solar cell (OSC), b transmission electron microscopy (TEM) images of functionalized carbon nanotubes (CNTs), c CNTs coated with TiOx using atomic layer deposition (ALD), and J–V characteristics of an inverted OSC, d under 1 sun illumination and e without illumination. Reprinted with permission from Jin et al. [80], © 2012, Elsevier
