Efficient Extraction of Hot Carriers in Perovskite Quantum Dot through Building State Coupled Complex

TL;DR

This paper demonstrates a novel approach to efficiently extract hot carriers from CsPbI3 quantum dots by constructing state-coupled complexes with fullerene derivatives, achieving up to 84% efficiency and advancing hot carrier photovoltaic technology.

Contribution

It introduces the first successful realization of hot carrier extraction in CsPbI3 quantum dots via state-coupled complexes, revealing new carrier transport channels.

Findings

Achieved maximum hot carrier extraction efficiency of ~84%.

Built state-coupled complexes create new transport channels at 0.22 eV above bandgap.

Visualized the connection between molecule interaction and hot carrier extraction.

Abstract

Utilizing hot carriers is the crucial approach for solar cell to exceed the thermodynamic detailed balance limit, yet effective extraction of hot carriers in absorber materials via most commonly used semiconductor acceptors has been a challenge in both materials and photophysics research for many years. Herein, we build series of CsPbI3 quantum dot and fullerene derivative systems to explore the decisive factors of this process and have for the first time realized efficient hot carrier extraction in these systems (maximum extraction efficiency ~ 84%). We find building the systems as state-coupled complexes creates new carrier transport channels at about 0.22 eV above CsPbI3 quantum dot bandgap, which facilitates highly efficient HC extraction. Our research directly visualizes the inner connection of molecule interaction and ultrafast hot carrier extraction. The knowledge and strategy gained here are of universal meaning, taking an important step forward true hot carrier photovoltaics.