Abstract
Cross-sections of a hole-conductor-free CH3NH3PbI3 perovskite solar cell were characterized with Kelvin probe force microscopy. A depletion region width of about 45 nm was determined from the measured potential profiles at the interface between CH3NH3PbI3 and nanocrystalline TiO2, whereas a negligible depletion was measured at the CH3NH3PbI3/Al2O3 interface. A complete solar cell can be realized with the CH3NH3PbI3 that functions both as light harvester and hole conductor in combination with a metal oxide. The band diagrams were estimated from the measured potential profile at the interfaces, and are critical findings for a better understanding and further improvement of perovskite based solar cells.
Highlights
Organo metal halide perovskite junctions in perovskite based solar cells Alex Dymshits1*, Alex Henning2*, Gideon Segev[2], Yossi Rosenwaks2 & Lioz Etgar[1]
Cross-sections of a hole-conductor-free CH3NH3PbI3 perovskite solar cell were characterized with Kelvin probe force microscopy
Kelvin probe force microscopy on cross-sections of hole-conductor-free perovskite based solar cell in dark (Fig. 1a) was used to determine the electronic structure of the interfaces that are critical for the performance (a)
Summary
The perovskite penetrates through the nc-Al2O3, sintered to the grounded contact; the Fermi level is assumed to be aligned and equal in all three layers This allows a quantitative interpretation of the measured potential for both solar cell structures. These variations are mainly due to the nanostructure and inhomogeneous surface of the measured materials entail a high amount of defect states. The nc-TiO2/MAPbI3 based solar cell has a higher efficiency, the potential difference between the two interfaces in the dark (35 mV) is negligible small. The dopant concentration, Nd, can be estimated with equation 122, Grain boundary
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