Fig. 2: Study on the interfacial properties of chemisorption.
From: Fully chemical interface engineering for statically and dynamically stable perovskite solar cells
a Schematic of possible chemical reactions of DTPA and Zol. b DFT calculations of the binding energy of DTPA with SnO2. c DFT calculations of the binding energy of Zol with SnO2. d Surface integration of the differential charge density obtained from DFT calculations. e KPFM measurements showing the CPD distribution of SnO2 films before and after modification. The inset shows surface potential images of Control (left) and Target (right). f‒i XPS spectra of the O 1 s core level before and after washing with DMF for different SnO2 electrodes: (f) SnO2, (g) SnO2-DTPA, (h) SnO2/Zol, (i) SnO2-DTPA/Zol. The numbers in the figure represent the ratio of the -OH peak area to the lattice O peak area.
