Unveiling Ultrafast Carrier Extraction in Highly Efficient 2D/3D Bilayer Perovskite Solar Cells

Mriganka Singh, I. Hung Ho, Anupriya Singh, Ching Wen Chan, Jing Wei Yang, Tzung Fang Guo, Hyeyoung Ahn, Vincent Tung, Chih Wei Chu, Yu Jung Lu

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)


The development of multidimensional heterostructure (2D/3D) lead halide perovskites has emerged as an effective approach to enhancing the efficiency and long-term stability of perovskite solar cells (PSCs). However, a fundamental understanding of the working mechanisms, such as carrier extraction, and carrier transfer dynamics in the multidimensional perovskites heterostructures remains elusive. Here, we observe the ultrafast carrier extraction in highly efficient 2D/3D bilayer PSCs (power conversion efficiency of 21.12%) via femtosecond time-resolved pump-probe transient absorption spectroscopy (TAS). Notably, the formation of quasi-equilibrium states resulting in a subband absorption feature with an ultrafast lifetime of 440 fs was observed, and this feature is found only in 2D/3D perovskite heterostructure. The short-lived feature gives rise to the local electric-field-induced electroabsorption, resulting in an enhanced power conversion efficiency in 2D/3D PSCs. These findings can help comprehend the advanced working mechanism of highly efficient solar cells and other 2D/3D bilayer perovskite-based optoelectronic devices.

頁(從 - 到)3584-3591
期刊ACS Photonics
出版狀態Published - 2022 11月 16

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 生物技術
  • 原子與分子物理與光學
  • 電氣與電子工程


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