Optoelectronic engineering of colloidal quantum-dot solar cells beyond the efficiency black hole: a modeling approach

摘要: Colloidal quantum dot (CQD) solar cells have been under the spotlight in recent years mainly due to their potential for low-cost solution-processed fabrication and efficient light harvesting through multiple exciton generation (MEG) tunable absorption spectrum via size effect. Despite impressive advances achieved charge carrier mobility of solids cells’ trapping capabilities, progress CQD cell efficiencies has slow, leaving them behind other competing technologies. In this work, using comprehensive optoelectronic modeling simulation, we demonstrate presence a strong efficiency loss mechanism, here called “efficiency black hole”, that can significantly hold back improvements by any enhancement strategy. We prove hole is result sole focus on either or extraction capabilities cells. This means given thickness layer, accomplished exclusively optic electronic aspect do not necessarily translate into tangible efficiency. The results suggest order come out mentioned hole, incorporation an effective strategy high quality film at same time essential necessity. Using developed model, requirements approach expected after its implementation are predicted as roadmap research community.