Abstract
Organometallic halide perovskites have recently emerged as a new class of light absorbers that have demonstrated a rapid progress and impressive efficiencies (>20%) for solar conversion applications. Despite the rapid progress demonstrated by these light absorbers, there is still a lack of understanding of some fundamental material/physical/chemical properties of these materials. In this presentation, I will present our recent studies toward a better understanding and control of perovskite nucleation, grain growth, and microstructure evolution using solution processing.1 The precursor chemistry and growth conditions are found to affect significantly the structural and electro-optical properties of perovskite thin films. Devices based on different grain sizes were investigated to correlate the grain sizes with device performance. The impact of grain size on charge carrier dynamics was also studied. Although we used the standard TiO2/perovskite/spiro-MeOTAD sandwich structure, we found evidence of a p-n junction rather than the commonly reported p-i-n structure for our studied devices.2 In addition, I will briefly discuss our recent investigation on stabilizing perovskite structures by tuning tolerance factor through solid state alloying.3 These results and others will be discussed. References 1 M. Yang, Y. Zhou, Y. Zeng, C.-S. Jiang, N. P. Padture, K. Zhu, Adv. Mater. 27, 6363 (2015). 2 C.-S. Jiang, M. Yang, Y. Zhou, B. To, S. U. Nanayakkara, J. M. Luther, W. Zhou, J. J. Berry, J. van de Lagemaat, N. P. Padture, K. Zhu, M. M. Al-Jassim, Nature Commun. 6, 8937 (2015). 3 Z. Li, M. J. Yang, J. S. Park, S. H. Wei, J. J. Berry, K. Zhu, Chem. Mater. 28, 284 (2016).
Published Version
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