We study doped molybdenum oxide (MoO3) thin films as thickness-tunable transport layers in organic photovoltaics. In an illustrative device, we show that the introduction of thick pristine MoO3 layers is unfavorable for device operation due to an increased series resistance, but this can be overcome by doping the transport layer with small amounts of metal. However, as opposed to a conventional doping mechanism, we ascribe the doping-induced conductivity enhancement to originate from an improved crystallinity of MoO3. This latter effect appears to be an example of metal induced crystallization. These flat, transparent, and conductive MoO 3 layers are ideal candidates for high work function transport layers in several architectures of organic or other thin film optoelectronic devices and we demonstrate this by its use in tandem organic photovoltaics.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)