Publication date: 22nd July 2026
Film inhomogeneities, such as thickness variations, are usually consider a caveat for reproducibility and upscaling of thin film-based technologies. Controlled wedges, however, open up the possibility to evaluate how thickness affects a particular device in a continuous fashion, facilitating device optimization and accelerating material screening. Moreover, novel device concepts arise from the use of active layers exhibiting thickness gradients.
In this talk, I would first describe the fabrication of organic semiconductor films exhibiting controlled thickness gradients by evaporation [1] and by solution processing [2]. Then, I would show how this type of sample can be used for the high throughput optimization and materials screening for organic solar cells. The large body of data produced in this fashion can then serve as input to evaluate different theoretical frameworks for solar cells, such as drift-diffusion, kinetic Montecarlo, and machine learning models [2].
Besides device optimization, wedges open the opportunity to fabricate novel devices, such as position sensitive photodetectors [1] and miniature spectrometers based on microcavities [3]. As a final example, we will use optical microcavities with a thickness gradient in the core to tune the resonance and easily find the conditions to enhance the Raman signal of diluted molecules, thus opening the possibility to study solid state vibrations in isolated molecules.
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