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a) Top‐view SEM images of FTO glass substrate and SnO2 film deposited on the pure FTO. b) An illustration depicting the MgO HBL can effectively block the penetration of perovskite on the FTO surface. c) The perovskite can directly contact the FTO surface along a shunt pathway in the absence of SnO2 ETLs. d) The MgO HBL can inhibit the penetration of perovskite reaching the FTO surface. e) SEM image of a perovskite absorber layer surface. f) Cross‐section SEM image of a device.
