The purpose of the work is to find an appropriate flexible material to replace commonly used transparent conductive oxides (TCO) in photovoltaic (PV) emitter electrode applications. Authors show the alternative, potential possibility of using PEDOT conductive polymer as transparent emitter contacts for thin-film, flexible photovoltaic structures. The vast majority of contacts made of TCO layers, dominantly indium tin oxide ITO, are electrically unstable under the influence of mechanical stresses [1,2,3]. This drawback inhibits their usage in flexible devices, such as solar cells. The need of the development in the field of flexible PV structures induces searching for new materials. Investigated transparent conductive layers (TCL) were made of organic compositions based on PEDOT polymer and their parameters were compared with equally measured parameters of carbon nanotube (CNT) layers, commercial ITO and AgHT ultra-thin silver layers. Transparent conductive layers based on PEDOT:PSS compound were deposited on flexible substrates by screen printing technique. The analysis of achieved results shows the broad spectrum of application possibilities for PEDOT layers.
In this paper authors present the mechanical, optical and electrical parameters of Indium Tin Oxide (ITO) Transparent
Conductive Layers (TCL) deposited on flexible substrate. Layers’ properties are analyzed and verified. Investigated
Transparent Conductive Oxide (TCO) was deposited, using magnetron sputtering method. Flexible polymer PET
(polyethylene terephthalate) foil was used as a substrate, in order to photovoltaic (PV) cell’s emitter contact application
of investigated material. ITO-coated PET foils have been dynamically bent on numerous cylinders of various diameters
according to the standard requirements. Resistance changes for each measured sample were measured and recorded
during bending cycle. Thermal durability, as well as temperature influence on resistance and optical transmission are
Presented results were conducted to verify practical suitability and to evaluate possible applications of Indium Tin Oxide
as a front contact in flexible photovoltaic cell structures.