A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance
Perovskite materials, as emerging semiconductors, have attracted significant attention for their exceptional optoelectronic properties, tunable bandgaps, ease of fabrication, and cost-effectiveness, making them promising candidates for next-generation optoelectronic devices. The all-inorganic perovs...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2024-12-01
|
| Series: | Crystals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4352/14/12/1068 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Perovskite materials, as emerging semiconductors, have attracted significant attention for their exceptional optoelectronic properties, tunable bandgaps, ease of fabrication, and cost-effectiveness, making them promising candidates for next-generation optoelectronic devices. The all-inorganic perovskite Cs<sub>2</sub>AgBiBr<sub>6</sub> distinguishes itself from other perovskite materials due to its remarkable optical absorption and emission properties, excellent stability, prolonged carrier recombination lifetime, and nontoxic characteristics. However, a deeper understanding of its unique luminescent properties and a further optimization of its structure and performance are still necessary. This study systematically investigates the optimization of Cs<sub>2</sub>AgBiBr<sub>6</sub> double perovskite films through A-site Na<sup>+</sup> doping. At an optimal Na<sup>+</sup> doping concentration of 3.5% (Na<sub>0.07</sub>Cs<sub>1.93</sub>AgBiBr<sub>6</sub>), the film shows 1.4 times and 2.7 times enhancement in light absorption and photoluminescence intensity, compared to the undoped film. Low-temperature spectroscopy measurements indicate that Na<sub>0.07</sub>Cs<sub>1.93</sub>AgBiBr<sub>6</sub> exhibits higher exciton binding energy and phonon energy. Based on Na<sub>0.07</sub>Cs<sub>1.93</sub>AgBiBr<sub>6</sub>, the photodetectors demonstrate significant performance improvements, with a high photocurrent response of 10<sup>−2</sup> A, a photo-to-dark current ratio (<i>PDCR</i>) of 7.57 × 10<sup>4</sup>, a responsivity (<i>R</i>) of 16.23 A/W, a detectivity (<i>D*</i>) of 2.92 × 10<sup>12</sup> Jones, a linear dynamic range (<i>LDR</i>) of 98.75 dB, and a fast response time of 943 ms. This work provides a promising strategy for optimizing all-inorganic perovskite materials through doping and offers guidance for enhancing high-performance photodetectors. |
|---|---|
| ISSN: | 2073-4352 |