Ambient Air and Hole Transport Layer Free Synthesis: Towards Low Cost CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Solar Cells

<div>(a) AFM micrograph and (b) XRD pattern of TiO<sub>2</sub> film.</div>

Journal of Nanomaterials

Figure 1: Ambient Air and Hole Transport Layer Free Synthesis: Towards Low Cost CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Solar Cells 