Advanced characterization of perovskite thin films for photovoltaic applications

Pablo Guardia^a, Alejandro Ruiz^a, Florian Oliva^a, Victor Izquierdo-Roca^a, Paul Pistor^a, Andreu Cabot^a^,^b, Alejandro Perez-Rodriguez^a^,^c

^aCatalonia Institute for Energy Research, Jardins de les Dones de Negre, 1, 2nd floor, sant adria del valles, barcelona, 8930, Spain

^bIN2UB, Universitat de Barcelona, C. Martí Franquès 1, 08028 Barcelona, Spain

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Paul Pistor, 397
Publication date: 5th February 2015

In the recent years, there has been an impressively fast technological progress in the development of highly efficient solar cells based organic-inorganic lead halide perovskite thin films, while stability and the application of the heavy metal lead are still open points of concern. In this contribution, we report on our advances in characterizing different hybrid organic-inorganic lead halide perovskite thin films with Raman and photoluminescence (PL) spectroscopy. The most commonly used methyl ammonium (MA) lead iodide perovskite thin films are compared to films with varying halide composition (I, Cl, Br) and films were the lead has been substituted by Sn. We show how the structural and optical properties of the analyzed thin films are affected by compositional changes and compare different deposition techniques such as dry co-evaporation to wet-chemical processes such as spin-coating. The analysis includes a study of degradation and decomposition dynamics for perovskite thin films upon air exposure and thermal stressing. The obtained structural and optical data are correlated with the performance of completed solar cell devices. Of the investigated samples, best solar cell devices have surpassed 10% power conversion efficiency up to now.

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