Colloidal Nanocrystals as a Platform for Rapid Screening of Charge Trap Passivating Molecules for Metal Halide Perovskite Thin Films
| Autor: | J. Scott Niezgoda, Alexander Z. Chen, Joshua J. Choi, Shelby Cuthriell, Lucy U. Yoon, Matthew R. Alpert, Benjamin Foley |
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| Rok vydání: | 2018 |
| Předmět: |
Photoluminescence
Materials science Passivation General Chemical Engineering Halide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Nanocrystal Materials Chemistry Molecule Surface charge Thin film 0210 nano-technology Perovskite (structure) |
| Zdroj: | Chemistry of Materials. 30:4515-4526 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b00414 |
| Popis: | Charge recombination at surface trap sites is a significant impediment to metal halide perovskite (MHP) thin film-based optoelectronic devices. To passivate the surface charge traps, chemical treatments with molecules that bind to the MHP thin film surfaces can be employed. However, the current approaches to test the trap passivation efficacy of molecules on thin film surface suffer from limited through-put and low statistical significance. Here, we demonstrate the use of colloidal MHP nanocrystals (NCs) as an experimental platform for high-throughput screening of charge trap passivating molecules for MHP thin films. Using CsPbX3 (X = Br, I) NCs, over 20 molecules were rapidly screened for their surface trap passivation efficacy. Our approach identified trin-butylphosphine (TBPh) as a superb charge trap passivating molecule on MHP surfaces. TBPh treatment brings the photoluminescence quantum yield of CsPbBr3 NCs to near unity and also results in superior surface trap passivation of MHP thin films, even wh... |
| Databáze: | OpenAIRE |
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