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Inkjet Printing All Inorganic Halide Perovskite Inks for Photovoltaic Applications
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Surface Versus Bulk State Transitions in Inkjet-Printed All-Inorganic Perovskite Quantum Dot Films
Thilini K Ekanayaka1, Dylan Richmond2, Mason McCormick3
1Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.
Nanomaterials (Basel, Switzerland)
|November 26, 2022
Summary
This study demonstrates facile anion exchange in perovskite quantum dots (PQDs) through direct mixing and inkjet printing, creating fully alloyed CsPbBr3 and CsPbI3 materials. Characterization confirms thermodynamic favorability for alloying, not clustering, and reveals distinct surface and bulk electronic structures.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Dot Research
Background:
- Perovskite quantum dots (PQDs) offer tunable optoelectronic properties.
- Controlling halide composition in PQDs is crucial for optimizing performance.
- Alloying pure halide PQDs presents a pathway to mixed-halide materials.
Purpose of the Study:
- To demonstrate facile anion exchange in CsPbBr3 and CsPbI3 quantum dots.
- To investigate the alloying behavior and resulting material phases.
- To characterize the electronic structure differences between surface and bulk in alloyed PQDs.
Main Methods:
- Direct mixing of pure CsPbBr3 and CsPbI3 quantum dot solutions.
- Interlayer printing using a commercial inkjet printer with pure perovskite solutions.
- Characterization via optical absorption spectroscopy, photoluminescent spectroscopy, X-ray diffraction (XRD), and X-ray photoemission spectroscopy (XPS).
- Time-resolved photoluminescence spectroscopy (TRPL).
Main Results:
- Facile anion exchange achieved, forming a completely alloyed single-phase mixed halide perovskite.
- Thermodynamic favorability for alloying confirmed; clustered alloy formation is disfavored.
- Observation of a surface-to-bulk photoemission core level transition in Cs 4d spectra, indicating different surface and bulk electronic structures.
- TRPL data suggests multiple excitonic decay features attributed to surface and bulk states.
Conclusions:
- Anion exchange is an effective method for creating alloyed perovskite quantum dots.
- The electronic properties of alloyed PQDs are influenced by distinct surface and bulk environments.
- This work provides insights into the fundamental processes governing halide exchange and alloying in PQDs.
