Reviving Near-Infrared Emission for Sn-Pb Alloyed Perovskite Quantum Dots by Sodium Doping

Feng Liu^a, Yaohong Zhang^a, Chao Ding^a, Taro Toyoda^a, Shuzi Hayase^a, Qing Shen^a

^aUniversity of Electro-communications

Proceedings of Online Meetup: Perovskite Quantum Dots: Syntheses, Physical Properties and Applications to Optoelectronic Devices (PerQD)

Online, Spain, 2020 June 12th - 12th

Organizer: Qing Shen

Poster, Feng Liu, 010
Publication date: 10th June 2020

ePoster:

Phase-stable CsSnxPb1-xI3 perovskite quantum dots (QDs) hold great promise for optoelectronic applications owing to their strong response in the near-infrared region. Unfortunately, optimal utilization of their potential is limited by the severe photoluminescence (PL) quenching, leading to extremely low quantum yields (QYs) of ~0.3%. Ultra-low sodium (Na) doping presented in this work is found to be effective in improving PL QYs of these alloyed QDs without alerting their favorable electronic structure. X-ray photoelectron spectroscopy (XPS) studies suggest the formation of a stronger chemical interaction between I- and Sn2+ ions upon Na doping, which potentially helps to stabilize Sn2+ and suppresses the formation of I vacancy defects. The optimized PL QY of the Na-doped QDs reaches up to ~28%, almost two orders of magnitude enhancement compared with the pristine one.

References:

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[2] Jokar, E.; Chien, C.-H.; Tsai, C.-M.; Fathi, A.; Diau, E. W.-G., Robust Tin-Based Perovskite Solar Cells with Hybrid Organic Cations to Attain Efficiency Approaching 10%. Adv. Mater. 2019, 31 (2), 1804835.

[3] Bodnarchuk, M. I.; Boehme, S. C.; ten Brinck, S.; Bernasconi, C.; Shynkarenko, Y.; Krieg, F.; Widmer, R.; Aeschlimann, B.; Günther, D.; Kovalenko, M. V.; Infante, I., Rationalizing and Controlling the Surface Structure and Electronic Passivation of Cesium Lead Halide Nanocrystals. ACS Energy Lett. 2019, 4 (1), 63-74.

Acknowledgements:

This research was supported by the Japan Science and Technology Agency (JST) Mirai program (JPMJMI17EA), the MEXT KAKENHI Grant (Grant 26286013, 17H02736), and JSPS International Research Fellow (Faculty of Informatics and Engineering, UEC).

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