  The stability and reproducibility issues related to metal halide Perovskite
Solar Cells (PSCs) have prevented so far from exploiting this highly efficient
photovoltaic technology under rainy or even moisture conditions and in
combination with drop triboelectric nanogenerators (D-TENGs). Protecting the
PSCs with a waterproof encapsulator could overcome such a disadvantage. Herein,
we propose the implementation of fluorinated carbon (CFx) coatings produced by
PECVD, enabling waterproof capability for the PSC and working as an energy
harvesting surface for D-TENGs. These 100 nm - films present optimal optical
transmittance, fully preserving the photovoltaic parameters of the cell. The
improved long-term stability of the water-resistant PSCs prevents degradation
under illumination in outdoor or simulated adverse environments with high
humidity, high temperature, water immersion, or rain. As a remarkable result,
the 50% Power Conversion Efficiency (PCE) has been retained after ten days of
illumination under 100% relative humidity at 50 degrees Celsius. Also, the CFx
coatings were successfully tested as a promoter agent to integrate commercial
UV-curable sealants compatible with Spiro-OMeTAD, enhancing the performance
stability of up to 80 % of PCE after 100 hours under illumination in a humid
environment. This PSC was tested in a top-bottom electrode configuration for
harvesting kinetic energy from droplets. Devices were compatible with
simultaneously working as D-TENG and photovoltaic cells, yielding voltage
outputs up to 12 V with maximum peak power density reaching 2.75 uW/cm2 defined
by the D-TENG and PCE of 11.5 % and 8.46 mA/cm2 of short circuit current
determined by the PSC under dripping and for an illumination angle of 45
degrees. The durability of the multisource device was tested under constant
illumination and periodical drop impacting for more than 5 hours.
