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Highly Efficient Organic-Inorganic Hybrid Perovskite Optoelectronic Devices via Morphological Control

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Title
Highly Efficient Organic-Inorganic Hybrid Perovskite Optoelectronic Devices via Morphological Control
Author
Yu, Jae Choul
Advisor
Song, Myoung Hoon
Issue Date
2018-02
Publisher
Graduate School of UNIST
Abstract
Organic-inorganic hybrid perovskite materials have been extensively researched because of their amenability to solution based-processing; their superior electrical properties, including high carrier mobility, long carrier lifetime; and the ability to tune their optical bandgaps through the substitution of halides. Moreover, these materials exhibited good light emitting in near-infrared and visible range with narrow band emission and high photoluminescence quantum efficiency (PLQY). For this reason, perovskite materials have attracted much attention as the next-generation optoelectronic devices. One of the most critical issues for perovskite optoelectronic devices is the morphological control of the perovskite films. The electrical and optical properties, such as the charge recombination, light harvesting property, diffusion length, and PLQE can be significantly influenced by the morphology of perovskite film. Therefore, the ability to achieve a perovskite layer with a uniform morphology, high crystallinity is critical for the preparation of highly efficient perovskite optoelectronic devices. Here, I present variety morphological control of perovskite film strategies employing the addition of acid, the addition of polymer matrix, solvent dropping engineering, annealing time and temperature control of perovskite film, and surface modified titanium oxide (TiO2) as an electron transport layer (ETL) using amine-based polar solvents in perovskite solar cells (PeSCs) and perovskite light-emitting diodes (PeLEDs). A uniform and dense perovskite film with full surface coverage was realized using adequate solvent, optimized annealing time and temperature, and the polymer matrix, resulting in enhancing the device performance of perovskite optoelectronic devices. Moreover, the PeLEDs exhibited the full coverage of the green electroluminescence (EL) emission at turn on and operation voltage due to the high quality of the uniform perovskite film. In addition, such a polar solvent treatment between the TiO2 and perovskite films enhances electron injection and extraction and reduces the recombination of photogenerated charges at the interface in PeSCs and PeLEDs. These morphology control strategies are a promising way for high-efficiency perovskite optoelectronic devices such as perovskite solar cells (PeSCs), perovskite light-emitting diodes (PeLEDs), and perovskite laser.
Description
Department of Materials Science Engineering
URI
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