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Efficient Extraction of Hot Carriers in Perovskite Quantum Dot through Building State Coupled Complex
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Efficient Extraction of Hot Carriers in Perovskite Quantum Dot through Building State Coupled Complex
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Paper
Efficient Extraction of Hot Carriers in Perovskite Quantum Dot through Building State Coupled Complex
2022
Overview
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.
Publisher
Cornell University Library, arXiv.org
Subject
