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Supporting Information

Photoexcitation dynamics in solution-processed formamidinium lead iodide perovskite thin films for solar cell applications

Running Title: Optical properties of a hybrid perovskite

Hong-Hua Fang,1 Feng Wang,2 Sampson Adjokatse,1 Ni Zhao,2 Jacky Even,3 Maria Antonietta Loi1

1Photophysics & OptoElectronics, Zernike Institute for Advanced Materials, Nijenborgh 4, Groningen, 9747 AG, The Netherlands

2Department of Electronic Engineering, The Chinese University of Hong Kong, New Territories, Hong Kong

3Université Européenne de Bretagne, INSA, FOTON, UMR 6082, 35708 Rennes, France


Corresponding Author

* E-mail:,,

Figure S1. 2D pseudo-color plot of normalized emission spectra under pump fluence of 1.4 J/cm2 at different temperature for FAPbI3 starting from FAI/PbI2 (a) and FAI/PbI2+HI (b); the PL spectra are normalized at maximum intensity.

Figure S2. Photoluminescence spectra of FAPbI3 at 5 K. The spectrum is fitted with two Gaussian peaks, and the energy gap between the two peaks is 15 meV.

Figure S3. Streak camera data showing the time-resolved PL emission at 5 K for FaPbI3 thin films starting from (a) FAI/PbI2 and (b) FAI/PbI2+HI. PL spectra extracted after photoexcitation, showing the energy difference between two emissions. The energy difference is 18 meV for FaPbI3 thin films starting from (c) FAI/PbI2, and it is 15 meV for (d) FAI/PbI2+HI.

Figure S4. Normalized photoluminescence spectra at varied excitation power. A blue-shift in ASE has been observed when the pump power was increased from 28 nJ/cm2 to 6.7 J/cm2.

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