Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
As the emerging candidate for light-harvester and emitter, lead halide perovskites have shown huge progress due to their optoelectronic properties which stand out. [1,2] However, this device performance is still highly dependent on defect passivation. Especially for halide perovskite light-emitters, small grain is demanded which induces high surface-to-volume ratio. 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. [3] Employing PEG boosts the electroluminescence of lead halide perovskite-based light-emitting diodes (PeLEDs) and light-emitting electrochemical cells (PeLECs). [3,4] 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 abnormally augemented luminance (photoluminescent quantum yield over 20 %). The photophysical property of these blends is controlled by adding organic alkylammonium halide ligand, which may induce the formation of halide perovskites. A potential application exploiting phase-transition temperature is suggested as well.
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