Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 32: Perovskite and Photovoltaics 3 (joint session HL/CPP/KFM)

HL 32.4: Talk

Thursday, September 8, 2022, 15:45–16:00, H31

Enhancing the optical performance of perovskite nanoplatelets — •Stefan Martin¹, Carola Lampe¹, Nina Henke¹, Ioannis Kouroudis², Milan Harth², Alessio Gagliardi², and Alexander Urban¹ — ¹LMU Munich, Nanospectroscopy Group — ²TU Munich

Lead halide perovskites have been drawing a lot of interest during the last few years due to their unique properties. Their excellent optical performance combined with easy and cost-efficient production are interesting for both light-emitting devices and solar cells. Perovskite nanoplatelets are furthermore convincing with high photoluminescence quantum yields and narrow emission linewidths tunable from 430 to 505 nm. The thickness of these nanoplatelets can be tuned with a monolayer precision and determines the absorption and emission profile of the sample.

By using different machine learning approaches the synthesis parameters were investigated and optimized based on the emission spectrum. With this method, the emission properties of nanoplatelets with thicknesses reaching from 2 to 8 monolayers were enhanced. Additionally, the emission wavelengths can be finetuned using a post-synthetic enhancement treatment comprising a lead halide ligand solution. Depending on the time interval between synthesis and enhancement, a redshift of controllable extent can be introduced while further reducing the emission linewidth. With these strategies, a narrow and symmetric emission peak can be achieved at any desired wavelength. This is particularly interesting for the implementation in optoelectronic devices.