[16a-PB01-1~2] 9.3 Nanoelectronics

▲ [16a-PB01-1] How to extract hot carriers from perovskite nanocrystal by fullerenes: forming state-coupled complexes

〇(D)Yusheng Li¹, Dandan Wang¹, Yongge Yang¹, Yuyao Wei¹, Dong Liu¹, Hua Li¹, Chao Ding¹, Shuzi Hayase¹, Qing Shen¹ (1.The University of Electro Communications)

Keywords:hot carrier, perovskite, nanocrystal

Utilizing hot carriers (HCs) 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 nanocrystal (NC) and fullerene systems to explore the decisive factors of this process and 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 NC bandgap, which facilitates highly efficient HC extraction. Our research directly visualizes the inner connection of molecule interaction and ultrafast hot carrier dynamics. The knowledge and strategy gained here are of universal meaning, taking an important step forward true hot carrier photovoltaics.