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Multiple exciton generation is a process in which more than one electron holepair is generated per absorbed photon. It allows us to increase the efficiencyof solar energy harvesting. Experimental studies have shown the multipleexciton generation yield of 1.2 in isolated colloidal quantum dots. Howeverreal photoelectric devices require the extraction of electron hole pairs toelectric contacts. We provide a systematic study of the corresponding quantumcoherent processes including extraction and injection and show that a properdesign of extraction and injection rates enhances the yield significantly up tovalues around 1.6.

Optimization Schemes for Efficient Multiple Exciton Generation and Extraction in Colloidal Quantum Dots