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HL: Fachverband Halbleiterphysik

HL 80: Hybrid and Perovskite Photovoltaics IV (Joint session of CPP, DF, DS and HL, organized by HL)

HL 80.3: Vortrag

Donnerstag, 10. März 2016, 15:15–15:30, H2

Micrometer size grains of hybrid perovskite through rapid melting procedure — •Oleksandra Shargaieva, Felix Lang, Jörg Rappich, Carola Klimm, Manuela Klaus, Bernd Rech, and Norbert Nickel — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Kekuléstr. 5, 12489 Berlin (Germany)

Interest in hybrid perovskites as an absorber has flared since the first successful attempts in dye solar cells (DSCs) and continues to grow as a promising material for solar cells application. The usage of such compounds is often associated with the opportunity to substitute existing materials due to the remarkable simplicity of the production process and its low costs. On the other hand, solution based processing of solid perovskite layers often includes difficulties with crystallization, which could result in the formation of grain boundaries. This type of crystalline defect has a strong impact on the performance of devices and tends to lower the power conversion efficiency.

In our work, we propose a new solvent-free approach to produce perovskite type compounds based on its melting process. This simple technic allows to obtain bulk material with grain sizes of several micrometers. Melting process enables the control of the crystallization of hybrid perovskite and by that suppresses grain boundaries formation. Furthermore, the procedure was optimized and successfully introduced into thin-film fabrication. Consequently, melting of perovskites gives a possibility to decrease non-radiative recombination and therefore, can improve the performance of the device.