Lead Halide Perovskites: Synthesis, Properties & Applications in Hybrid Optoelectronic Devices

Abstract

The introduction of photovoltaic cells and light emitting diodes has defined this era of technology. Together they provide affordable renewable energy and high efficiency lighting. Despite all these benefits, current solid state materials are rapidly approaching theoretical device limits and will soon be unable to meet rising demands. In 2009, through a fusion of wet chemistry and nanotechnology, lead halide perovskite dots were identified. These novel materials exist as nanocrystalline semiconductors with bright, tunable absorption and emission wavelengths. As a result, perovskites are an intriguing candidate to work in tandem with solid state materials, promising to elevate device performance and efficiency. While an attractive prospect, such a combination is not without the significant challenges of material compatibility and stability, which must both be overcome to create a successful device. This thesis presents an overcoming of these obstacles by undertaking a detailed investigation of perovskite nanocrystals. Expertise in perovskite nanomaterials is developed to further their nanochemistry and optical properties with dramatic increases in photochemical lifetime obtained using polymeric encapsulation methods. The most promising candidate is then improved and brought to application in a device, resulting in a 100 % increase of Power Conversion Efficiency at UV wavelengths in a photovoltaic cell.

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Identifiers

ORCID for Peter Shaw: orcid.org/0000-0001-9044-1069

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