Materials science on perovskite solar cells

Christian Fettkenhauer, University Duisburg-Essen, Essen, Germany
Irina Anusca, University Duisburg-Essen, Essen, Germany
Maryam Khazaee, University Duisburg-Essen, Essen, Germany
Gerhard Lackner, University Duisburg-Essen, Essen, Germany
Doru C. Lupascu, University Duisburg-Essen, Essen, Germany

Recently perovskite solar cells (PSC) have attracted a lot of attention due to high achievable efficiencies using abundant hybrid organic-inorganic perovskite absorber materials. Herein we report different efforts to develop this fast growing research field in terms of development of new materials/ synthesis routes and cell design.

The benchmark perovskite absorber material is methylammonium lead iodide (CH3NH3PbI3). We present a novel hydrothermal route at autogenous pressure for the preparation of highly crystalline CH3NH3PbX3 (X = Cl, Br, I) perovskites. The materials were investigated by X-Ray powder diffraction and diffuse reflectance spectroscopy.

Besides the aforementioned CH3NH3PbX3 perovskites, formamidinium lead trihalides were found to be efficient light absorbing materials in PSCs possessing tunable bandgaps. Therefore, we explore lead halides of different formamidinium analogues and investigate them especially in terms of their structural and optical properties. Some of the obtained materials might be interesting for application in PSCs.

Heading to working PSCs, perovskite layers were synthesized by a two-step spin coating deposition of PbI2 and methylammonium iodide on a TiO2 buffer layer followed by a subsequent annealing step. Finally, gold electrodes were deposited via thermal evaporation under vacuum.

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