Proceedings of Online Meetup: Origins of Electronic Defects in Halide Perovskites (EDHP)
Publication date: 1st April 2020
As the emerging candidate for light-harvester and emitter, halide perovskites have shown huge progress due to their optoelectronic properties which stand out. However, this device performance is still highly dependent on defect passivation. Since defect state is rich in surface of perovskite grain, there have been enormous effort to suppress this defect. For instance, polyethylene glycol (PEG) with high molecular weight is a great passivator due to the electron lone pair in oxygen atom which can interact with the lead. Employing PEG boosts the electroluminescence of lead halide perovskite-based light-emitting diodes (PeLEDs) and light-emitting electrochemical cells (PeLECs). In addition, PEG liquid with low molecular weight dissolves lead halides as like conventional aprotic polar solvents, e.g. N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). In this regard, we investigate lead bromide-PEG solution and there is augmented luminance (photoluminescent quantum yield over 20 %). The investigation regarding this abnormal luminescent property supports comprehensive understanding of lead halide – solvent complex and potential application exploiting ionized perovskite in solution
This work has received funding from from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 834431), the Spanish Ministry of Science, Innovation and Universities (ex-MINECO) via the Unidad de Excelencia Marı ́a de Maeztu MDM-2015-0538, MAT2017- 88821-R
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