Figure 7

Transmission electron microscopy:
(a,b) TEM micrographs of CH3NH3PbI3+Zn2SnO4 sample at different magnification (c) highly magnified TEM image of CH3NH3PbI3+Zn2SnO4, (d) TEM image of single CH3NH3PbI3+Zn2SnO4 nanofiber (e) Highly magnified TEM image of CH3NH3PbI3+Zn2SnO4 (f) HRTEM image, (g) and (h) lattice fringes of selected area of Zn2SnO4 and CH3NH3PbI3 respectively.