Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 49, Pages 22117-22125Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202008724
Keywords
lead-free; perovskite nanocrystals; solar cells; time-resolved photoluminescence; ultrafast transient absorption spectroscopy
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Funding
- Jane & Aatos Erkko Foundation (project ASPIRE)
- Jane & Aatos Erkko Foundation (project SOFUS)
- Business Finland [1464/31/2019]
- Academy of Finland [319042, 326461, 326406]
- Academy of Finland Flagship Programme, Photonics Research and Innovation (PREIN) [320165]
- Academy of Finland (AKA) [319042, 319042] Funding Source: Academy of Finland (AKA)
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Colloidal lead-free perovskite nanocrystals have recently received extensive attention because of their facile synthesis, the outstanding size-tunable optoelectronic properties, and less or no toxicity in their commercial applications. Tin (Sn) has so far led to the most efficient lead-free solar cells, yet showing highly unstable characteristics in ambient conditions. Here, we propose the synthesis of all-inorganic mixture Sn-Ge perovskite nanocrystals, demonstrating the role of Ge(2+)in stabilizing Sn(2+)cation while enhancing the optical and photophysical properties. The partial replacement of Sn atoms by Ge atoms in the nanostructures effectively fills the high density of Sn vacancies, reducing the surface traps and leading to a longer excitonic lifetime and increased photoluminescence quantum yield. The resultant Sn-Ge nanocrystals-based devices show the highest efficiency of 4.9 %, enhanced by nearly 60 % compared to that of pure Sn nanocrystals-based devices.
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