Unveiling the Optoelectronic Properties of Seeded vs Unseeded grown MAPbBr3 Perovskite Single Crystals
Waqas Zia a b, Clara A. Aranda a b, Michael Saliba a b
a Institut für Photovoltaik (ipv), Universität Stuttgart, Pfaffenwaldring 47, D-70569 Stuttgart, Deutschland
b Institut für Energie und Klimaforschung (IEK-5), Forschungszentrum Jülich GmbH, D-52425 Jülich, Deutschland
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Oral, Waqas Zia, presentation 106
DOI: https://doi.org/10.29363/nanoge.hopv.2022.106
Publication date: 20th April 2022

Keywords: Photovoltaics, Perovskite single crystals, Inverse temperature crystallization, SCLC

Perovskite single crystals are gaining great prominence in the renewable energy field due to their outstanding properties, even beyond photovoltaics. In fact, the excellent responsivity values exceeding 104 AW-1 and response times lower than 1ns, make them optimal candidates for photo-detection applications [1-3]. However, the wide variety of growing methods and the poor control over the dimensions of the final crystal, leads to very different responses between bulk and surface regions. These differences affect directly to its properties, jeopardizing the optimal viability of their optical sensing applications. In this work, we address the differences in the recombination responses of two types of lead bromide perovskite single crystals grown by the well-known inverse temperature crystallization method (ITC).  Through photoluminescence and space charge limited current (SCLC) method, we demonstrate that just a small difference as seeded and unseeded nucleation assisted crystals, leads to great changes in their optical properties. A reduced formation of deep traps for the seeded growth, together with higher electrical conductivity (σ) (>1.5 times) are shown by the temperature dependent-SCLC.  These findings highlight the importance of morphology and control of growing processes to further optimize perovskite based-photodetectors.

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