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

TL;DR

This paper investigates how optimizing extraction and injection rates in colloidal quantum dots can significantly improve multiple exciton generation efficiency, advancing solar energy harvesting technologies.

Contribution

It provides a systematic quantum-coherent analysis of exciton extraction and injection, demonstrating how proper rate design enhances generation yield.

Findings

Yield increases up to 1.6 with optimized rates

Quantum coherent processes are crucial for efficiency

Designing extraction/injection rates improves solar cell performance

Abstract

Multiple exciton generation is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.