Fig. 3: Optical properties of SP and PHJ films.
a–d, UV–vis (a), PL (b), PLQY (c) and PL lifetime (d) measured on SP γ-CsPbI3 and β-CsPbI3 and PHJ with varying layer thickness. The box plot in c displays the mean, median line, 25~75% box limits with 1.5× interquartile range whiskers. To obtain the PLQY data displayed in c, 7, 4, 5, 7, 5, 7, 5 measurements were performed for β-CsPbI3, PHJ10, PHJ20, PHJ50, PHJ100, PHJ200 and γ-CsPbI3, respectively.
