Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.189
Publication date: 11th July 2022
Most advanced optoelectronic devices rely on the spatial patterning of the relevant properties of the active components. An example of this would be the RGB pixels sitting side by side in LED based screens. Interestingly, between a homogeneous thin film, and a highly complex pixelated board, there is a whole parameter space that can be navigated: that of samples with gradual changes in the properties of interest.
In this talk, I will first describe a number of methods that we have developed to produce organic semiconductors based gradients in film thickness, composition, doping level, molecular orientation and microstructure. Then, I will briefly mention how these samples, containing a wealth of information, can be employed for fundamental studies (such as deducing the phase diagram) or combinatorial optimization of solar cells. And then, in the last part of the talk, I will describe new device concepts based on samples with gradients, such as polarimeters without moving parts based on spherullitic macroscopic alignment, position sensitive photodetectors, and monolithic miniature spectrometers based on microcavities with thickness wedge active layers.