Regensburg 2016 – scientific programme

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DS: Fachverband Dünne Schichten

DS 11: Hybrid and Perovskite Photovoltaics I
(Joint session of CPP, DS and HL, organized by CPP)

DS 11.5: Talk

Monday, March 7, 2016, 16:00–16:15, H38

In-Situ Investigation of Optoelectronic Properties during One-Step Synthesis of MAPbI_3−xCl_x Perovskite — •Klara Suchan, Justus Just, Martin Kärgell, Dan R. Wargulski, Pascal Becker, and Thomas Unold — Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany

Organometal halide perovskites have emerged as promising absorber materials for solid state solar cells since 2012. With the fast improvement in power conversion efficiency to over 20 %, perovskites have high prospects for low-cost, high efficiency solar cell production. CH₃NH₃PbI_3−xCl_x layers are prepared by a one-step solution based process using PbCl₂ and MAI precursors dissolved in DMF. Since solution based processes do not need cost intensive vacuum technology and no high-temperature annealing steps, they yield high potential for industrial implementation. However, little is known about the exact mechanisms during synthesis, leading to poor reproducibility. Employing in-situ photoluminescence and reflection imaging as well as spectroscopy we monitor the growth process. The evolution of opto-electronic properties for various temperature profiles and annealing durations is analysed. Additional X-ray diffraction measurements during various stages of the process are used to evaluate structural changes occurring during film formation.