Fig. 4 | npj Quantum Materials

Fig. 4

From: Ferroic domains regulate photocurrent in single-crystalline CH3NH3PbI3 films self-grown on FTO/TiO2 substrate

Fig. 4

Opposite temperature variations in polar and nonpolar domains of CH3NH3PbI3 crystal across phase transition. a Erasing and reappearing of AFM topography domains by heating and cooling using a heated thermal probe. b AFM topography and c PFM mappings under a sequence of temperature across phase transition showing appearance and re-emergence of ferroic domains. d Topography line scan indicated in b before and after heating showing the disappeared topography feature at high temperature is fully recovered upon cooling. e Piezoresponses averaged in high-response polar and low-response nonpolar domains showing opposite trend with respect to temperature, yet convergence beyond phase transition

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