A Preferential Analysis of Physical Properties in Graphene Oxide Doped PEDOT:PSS Hole Transport Layers

Flexible and semitransparent hole transport layers in perovskite-based photovoltaics have been attracting increasing attention in recent years. Among the benefits they provide, such as being easily reproducible and affordable, they pose their own problems with device degradation, stability, and surface wettability. We probed the graphene oxide doped PEDOT:PSS (GO)/poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) composite for the application in 2D carbonaceous hole transport layers to improve perovskite solar cells. Advantages and problems are pointed out as well as new perspectives to further modify and retract the drawbacks of conducting polymers. We discussed the advancement of the hole transport layer and described the effects of graphene oxide (dopant) on device transmission, surface wettability, and film quality. Basic principles and mechanisms are covered in the development of polymeric hole transport layers and interfacial properties. Findings included the decrease in device transmission, lessened oxidation of the perovskite, and superior surface wettability. This work highlights the importance and relevance of thin, flexible and powerful photovoltaic systems.