Optimization of CsPbBr3 Perovskite-Based Composite Thin Film Fabrication Processes for Use in New-Generation Light Emission Diodes and Photodetectors

CsPbBr₃ perovskite nanocrystals (PNCs) are the focus of recent basic and applied research, with special emphasis on their use in photovoltaic cells, hybrid light-emitting diodes, single-photon sources, basic elements of optical computers, and other optoelectronic devices. The main problem limiting the use of PNCs is their low stability under normal conditions. Development of composite materials where PNCs are embedded in polymer matrices is an approach to solving the problem of the stability of PNCs contacting the atmosphere. Here, we report the results of experiments on designing composite thin films (TFs) consisting of PNCs and modified polymethyl methacrylate (PMMA). Specifically, samples of durable TFs containing CsPbBr₃ with a high photoluminescence quantum yield have been engineered, optimal parameters (including the spinning time, spinning rate, and concentration) for the spin-coating fabrication of the TFs have been found, and the TFs with a highly homogenous film coating have been obtained. This last factor is an important criterion for the use of PNC–PMMA composite as an active layer in quantum dot light-emitting diodes (QDLEDs). In addition, since PNCs are promising as a basis for the scintillating coating of detectors, whose performance depends on the homogeneity of the luminophore distribution within the scintillator (e.g., a CCD array), the results of this study could be used in developing X-ray detectors for medical applications.

1. Liu R. et al. // Nanoscale. 2019. V. 11 (19). P. 9302– 9309.

2. Yan W. et al. // Opt. Express. 2020. V. 28 (10). P. 15706.

3. Song J. // Adv. Mater. 2018. V. 30 (30). P. 1800764.

4. Rainò G. et al. // Nano Lett. 2019. V. 19 (6). P. 3648– 3653.

5. Shamsi J. et al. // Chem. Rev. 2019. V. 119 (5). P. 3296– 3348.

6. Chen J. et al. // Chem. Rev. 2021. V. 121 (20). P. 12112– 12180.

7. Jiang G. et al. // ACS Nano. 2019. V. 13 (9). P. 10386– 10396.

8. Padilha G. da S. et al. // Polimeros. 2017. V. 27 (3). P. 195–200.

9. Chen H. et al. // ACS Appl. Mater. Interfaces. 2018. V.

10. (34). P. 29076–29082. 10. Zvaigzne M. et al. // Nanomaterials. 2021. V. 11 (8). P. 2014.

11. Cheng X. et al. // J. Phys. D: Appl. Phys. 2018. V. 51 (40). P. 405103.

12. Pica G., Bajoni et al. // Struct. Dyn. 2022. V. 9 (1). P. 011101.

13. Elterman P. // Appl. Opt. 1970. V. 9 (9). P. 2140.