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...
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2024-12-01
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| author | Yuejia Wu Yanpeng Meng Qirun Hu Songchao Shen Chengxi Zhang Ang Bian Jun Dai |
| author_facet | Yuejia Wu Yanpeng Meng Qirun Hu Songchao Shen Chengxi Zhang Ang Bian Jun Dai |
| author_sort | Yuejia Wu |
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| description | 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. |
| format | Article |
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| institution | DOAJ |
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| language | English |
| publishDate | 2024-12-01 |
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| spelling | doaj-art-fbaabb7d092d436dbfe2cf41bfd373fe2025-08-20T02:53:34ZengMDPI AGCrystals2073-43522024-12-011412106810.3390/cryst14121068A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector PerformanceYuejia Wu0Yanpeng Meng1Qirun Hu2Songchao Shen3Chengxi Zhang4Ang Bian5Jun Dai6School of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaSchool of Science, Jiangsu University of Science and Technology, Zhenjiang 212100, ChinaPerovskite 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.https://www.mdpi.com/2073-4352/14/12/1068double perovskitealkali ion dopingCs<sub>2</sub>AgBiBr<sub>6</sub>photoluminescencephotodetectors |
| spellingShingle | Yuejia Wu Yanpeng Meng Qirun Hu Songchao Shen Chengxi Zhang Ang Bian Jun Dai A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance Crystals double perovskite alkali ion doping Cs<sub>2</sub>AgBiBr<sub>6</sub> photoluminescence photodetectors |
| title | A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance |
| title_full | A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance |
| title_fullStr | A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance |
| title_full_unstemmed | A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance |
| title_short | A-Site Ion Doping in Cs<sub>2</sub>AgBiBr<sub>6</sub> Double Perovskite Films for Improved Optical and Photodetector Performance |
| title_sort | a site ion doping in cs sub 2 sub agbibr sub 6 sub double perovskite films for improved optical and photodetector performance |
| topic | double perovskite alkali ion doping Cs<sub>2</sub>AgBiBr<sub>6</sub> photoluminescence photodetectors |
| url | https://www.mdpi.com/2073-4352/14/12/1068 |
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