fig2
![Organic-inorganic hybrid quasi-2D perovskites incorporated with fluorinated additives for efficient and stable four-terminal tandem solar cells](https://image.oaes.cc/46accc8e-a1ea-43df-8cde-bb4f853f8fc3/5379.fig.2.jpg)
Figure 2. Photoresponse properties of as-prepared perovskite films. (A) UV-Vis absorption spectra (in which Stage-x represents x layers of [PbI5Br]4- octahedra sandwiched between each two 3-TFMBA molecular planes), (B) corresponding (Ahν)2vs.hν curves, (C) steady PL spectra and (D) TRPL spectra of (3-TFMBA)2(Cs0.17FA0.83)n-1Pbn(I0.83Br0.17)3n-1I2 perovskite films.