Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.31: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Morphological and structural studies of perovskite layers deposited on various substrates — Mohammad I. Hossain, Mohammed I. Helal, and •Abdelhak Belaidi — Qatar Environment & Energy Research Institute (QEERI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, P.O. Box 5825 Doha, Qatar

Perovskite, (CH3NH3PbI3), is an organic-inorganic material that has showed vast potential as an absorber in the photovoltaic (PV) research due to its suitable electronic, optical, and structural properties. Morphological studies of such layers are beneficial for PV applications due to the variation in grain size which affects directly the charge transport. In this work, we have prepared perovskite (CH3NH3PbI3) layers using one step solution process in air on various substrates, like FTO and TiO2, with various concentration ratios of PbI2/ CH3NH3I from 0.3 to 1.1. The deposited layers were then characterized after post-annealing treatment in air at 100oC using XRD, SEM, and UV-Vis. The crystallographic structure of the layers deposited using such solution process depends on the ratio of PbI2/CH3NH3I. XRD results confirm that for the ratio 1.1 both perovskite and PbI2 phases exist, however for ratios 0.8, 0.7, and 0.6 only the perovskite phase exists. Interestingly, SEM images show that the morphology of the deposited films with ratios 1.1 and 0.8 are fibrous shape, whereas, for the other ratios the shape disappears. UV-Vis results confirm the bandgap of perovskite layers laying around 1.63 eV. Hence, the study of the variation of PbI2/CH3NH3I ratio is promising to design perovskite solar cells with the optimum morphological properties.