Regensburg 2016 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 45: Hybrid and Perovskite Photovoltaics IV
(Joint session of CPP, DF, DS and HL, organized by HL)
DS 45.11: Vortrag
Donnerstag, 10. März 2016, 17:45–18:00, H2
Temperature and excitation density dependence of two-photon photoluminescence of perovskite CH3NH3PbBr3 — •Heiko Linnenbank1, Michael Saliba2, Lili Gui1, Bernd Metzger1, Giuseppe Nasti2, Jeanette Kadro2, Anders Hagfeldt2, Michael Graetzel2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2Laboratory of Photonics and Interfaces, École polytechnique fédérale de Lausanne, Station 6, 1015 Lausanne, Switzerland
Recently solution processed organometallic halide perovskites have attracted much attention due to their simple processability, strong light absorption and favorable emission properties, which promises the realization of efficient on chip lasers. While several studies have been focused on one-photon excited luminescence processes like amplified spontaneous emission or lasing, only less attention has been paid to two-photon excited processes. In contrast to the usually expected quadratic dependence upon the excitation density in the case of two-photon photoluminescence, we rather measure a 4th power dependence at room temperature in the case of CH3NH3PbBr3. Such an excitation density dependence is a strong hint for a biexcitonic or exciton collision processes, which are rather unlikely at room temperature. To clarify the origin of the 4th power dependence, we investigate the form as well as the excitation density dependence of the photoluminescence spectra with respect to the sample temperature, revealing a suppression of the 4th power dependence with decreasing temperature.