The photovoltaic research has recently paid great attention on the perovskite compounds and their noteworthy potential to be processed by scalable low-cost deposition methods, like inkjet printing. The employment of this digital technology in perovskite-based photovoltaics is currently limited by issues related to the need of producing smooth, compact photoactive layers with suited cristallinity. In this work, a study of the effect of the printing parameters on the morphology and optical properties of printed perovskite layers obtained through a double-step process is reported. The electrical characteristics of the solar cell devices printed with a different nozzle number have indicated that the best performances can be reached with a working condition at reduced number of multiple simultaneous droplets.

The influence of environment during device fabrication and measurement conditions are critical issues to realize efficient perovskite solar cells on large scale and push the industrial development. In this work un-encapsulated methylammonium lead iodide perovskite solar cells were fabricated and characterized in different relative humidity environment and the effect on the performance metrics of voltage pre-bias and scan rate were analyzed. The value of short-circuit current density estimated from characteristic curves and calculated from external quantum efficiency spectra are compared. A preliminary measurement procedure was proposed. The best solar cells were obtained by fabricating the devices at 40% relative humidity and changing the dopants of hole transport material reaching 12.6% of power conversion efficiency.