Ultrathin organic spin-on layers on indium tin oxide as a prospective tool for enhanced light throughput

Organic layers coated on ITO-glass substrates have widespread applications in many optoelectronic devices and displays. Here, we report certain organic/polymer ultrathin layers could boost optical transmittance by 10-15% in a wavelength range that strongly depends on the layer thickness. Studies with normal incidence reflection spectroscopy suggest towards the formation of an antireflection (AR) layer whenever film refractive index requirement is satisfied. Additionally, these film layers reduce scattering loss from the substrate surface that further improves the clarity. Using spin-coated PEDOT:PSS layers with varying spin speeds, we showed that thickness assessment of such layers with lower surface roughness's are possible from the antireflection principles. In the 350-800 nm wavelength range, use of certain polymer layers could result in ~4-6% gain in the photon influx that could be functional in the optoelectronic devices.