Fig. 6From: Effect of non-stoichiometry of initial reagents on morphological and structural properties of perovskites CH3NH3PbI3Raman spectra of CH3NH3PbI3 films formed of the 1:1 mixture of PbI2 and CH3NH3I in DMF: directly after deposition on a glass substrate at T = 90 °C (1); after irradiation by laser light for 200 s (2); after irradiation for 400 s (3). Raman spectra of films formed from the solution of pure PbI2 (4) and CH3NH3I (5) in DMF. All spectra were obtained with λexc = 532 nm at room temperatureBack to article page