Abstract
The response speed of the reported Cs2AgBiBr6-based photodetectors exhibits a wide variation ranging from microseconds to nanoseconds, while the reason is still unclear. Apart from the conventional approaches such as reducing effective area, new regulating approaches for response speed improvement have rarely been reported. On the other hand, it is generally believed that ultraviolet (UV) light has negative impact on perovskite devices resulting in performance degradation. In this work, we demonstrated that the response speed of the photodetector with FTO/Cs2AgBiBr6/Au structure can be effectively regulated by utilizing UV light-soaking effect without reducing the device area. Particularly, the decay time is efficiently modulated from 30.1 µs to 340 ns. In addition, the −3 dB bandwidth of the device is extended from 5 to 20 kHz. It is worth mentioning that the light current is remarkably boosted by 15 times instead of any attenuation. Furthermore, we prove the universality of UV soaking treatment on Cs2AgBiBr6-based photodetectors with other all-inorganic structures, i.e., FTO/TiO2/Cs2AgBiBr6/Au, FTO/Cs2AgBiBr6/TiO2/Au and FTO/TiO2/Cs2AgBiBr6/CuSCN/Au. Our results demonstrate a new method to improve the response speed and light current of Cs2AgBiBr6-based perovskite all-inorganic photodetectors.
摘要
目前已报道的Cs2AgBiBr6光电探测器的响应速度在毫秒到纳秒 量级宽度区间变化, 随机性强, 但原因尚不明确, 新的响应速度调控方 法也鲜有报道. 此外, 在传统观念中, 紫外光通常被认为对钙钛矿器件 存在有害作用, 会使器件性能衰减. 在本工作中, 我们证明了在不减小 器件面积的情况下, FTO/Cs2AgBiBr6/Au结构光电探测器的响应速度可 以利用紫外光浸泡效应实现有效调控. 特别是下降时间可以从30.1 µs 有效调控到340 ns, 且器件的−3 dB带宽可从5 kHz扩展至20 kHz. 值得 一提的是, 紫外光浸泡处理后, 器件光电流显著提升了15倍. 此外, 我们 还进一步证明了紫外光浸泡处理方法对FTO/TiO2/Cs2AgBiBr6/Au、 FTO/Cs2AgBiBr6/TiO2/Au和FTO/TiO2/Cs2AgBiBr6/CuSCN/Au结构的 Cs2AgBiBr6基器件同样有效. 本工作为提高Cs2AgBiBr6全无机钙钛矿光 电探测器响应速度和光电流提供了新的方法和思路.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (51772135 and 52002148), the Ministry of Education of China (6141A02022516), the Fundamental Research Funds for the Central Universities (11619103) and Guangdong Basic and Applied Basic Research Foundation (2020A1515011377). Yuan Y and Yan G thank the support from China and Germany Postdoctoral Exchange Program. Fan HJ thanks the financial support from Agency for Science, Technology, and Research (A*STAR), Singapore by the AME Individual Research Grants (A1883c0004).
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Author contributions Yuan Y proposed the idea, designed and engineered the device samples; Li Z and Jiang B performed the chemical experiments and the characterization; Yan G proposed the idea, analyzed the data and wrote the paper; Liang Z guided the characterization and data analysis; Fan HJ provided guidance and suggestions; this work was guided and supported by Mai W. All authors contributed to the general discussion.
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Ye Yuan received his BSc degree in optical information science and technology in 2013 and PhD degree in materials physics and chemistry in 2018 from Sun Yat-sen University (SYSU). He is now an assistant research fellow at the School of Physics, SYSU. His research interests are thin film photoelectric materials and devices, especially heterojunction photodetectors and solar cells.
Genghua Yan received her BSc degree in applied physics from the Central South University in 2013 and DE degree in materials physics and chemistry from SYSU in 2018. She joined the College of Science and Engineering, Jinan University as a postdoctor in the middle of 2018. She is now an assistant research fellow at the School of Physics, SYSU. Her main research interest focuses on advanced thin film materials and photoelectric devices.
Wenjie Mai is a professor as well as the head of the Deparment of Physics, Jinan University. He received his BSc degree from Peking University in 2002 and PhD degree from Georgia Institute of Technology (GIT) in 2009. He joined Jinan University in 2009. He was a visiting fellow at GIT from 2012 to 2013. His research area includes photoelectric materials, energy materials and the related flexible devices. His research currently focuses on supercapacitors, photodetectors and solar cells.
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UV soaking for enhancing the photocurrent and response speed of Cs2AgBiBr6-based all-inorganic perovskite photodetectors
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Yuan, Y., Yan, G., Li, Z. et al. UV soaking for enhancing the photocurrent and response speed of Cs2AgBiBr6-based all-inorganic perovskite photodetectors. Sci. China Mater. 65, 442–450 (2022). https://doi.org/10.1007/s40843-021-1745-5
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DOI: https://doi.org/10.1007/s40843-021-1745-5