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Metal halide perovskites have mixed electronic-ionic conductivity that contributes to intrinsic instabilities under operating conditions of voltage, light and temperature, exacerbated in environmental conditions involving oxygen and moisture. A lack of operando characterization, particularly of buried interfaces, limits rational improvement of perovskite solar cells. This talk will focus on measurement and quantification of relevant charge transfer processes at perovskite interfaces. We employ a new metrology approach to evaluate the electrochemical and spectroelectrochemical behaviors of perovskite interfaces, complemented with a combination of photoelectron spectroscopies and operando x-ray diffraction measurements.
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