(CHNH)BiI: A lead-free perovskite with >330 days humidity stability for optoelectronic applications
Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 7, Issue: 26, Page: 15722-15730
2019
- 34Citations
- 55Captures
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Article Description
A key challenge in the eco-friendly optoelectronic materials field is to find highly stable and nontoxic perovskite materials. Here, we report the optoelectronic properties and stability of the (CHNH)BiI perovskite material. Using an eco-friendly gas pump treatment technique, a dense and pinhole-free (CHNH)BiI film was fabricated. Remarkably, a large-area (>20 cm) Bi-based perovskite film was obtained, which is the largest Bi-based perovskite film ever reported. Besides, the (CHNH)BiI perovskite exhibits good solubility in ethanol, which is a safe and eco-friendly solvent. Thermogravimetric analysis results show the beginning of weight loss at ∼184 °C, suggesting excellent heat stability of this material. Most importantly, the (CHNH)BiI material can tolerate continuous moisture exposure for 334 days in ambient air owing to the presence of a hydrophobic organic chain. To the best of our knowledge, this is the longest moisture stability reported for lead-free perovskite materials so far. This work paves the way for realizing highly stable and nontoxic perovskite materials for potential optoelectronic applications.
Bibliographic Details
Royal Society of Chemistry (RSC)
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