Multi-Objective Optimization for Color-Tunability and Transparency in Colloidal Quantum Dot Solar Cells

Owing to their solution-processing flexibility, band gap tunability and infrared responsivity, colloidal quantum dots (CQDs) are favorable materials for building solar cells with tunable spectral profiles. Here, we design, optimize and fabricate multicolored and semitransparent CQD devices using thin-film interference and multiobjective optimization algorithms. We obtain a target color or transparency level by maximizing reflection or transmission over a relevant wavelength range while simultaneously maximizing device photocurrent. We fabricate color-tuned devices with photocurrents of 10-15 mA/cm
²
and semitransparent devices with ~30% visible transparency. Our optimization technique creates a foundation for the custom-design of spectrally selective optoelectronic devices.