Abstract
Due to distinctive lattice and electronic properties, the thiocyanate anion (SCN−) perovskite as an alluring two-dimensional (2D) material system, can be applied in optoelectronic devices. Herein, both photovoltaic and photodetection performances of the 2D Cs2Pb(SCN)2I2 have been investigated. Compared with the conventional cationic 2D perovskites, Cs2Pb(SCN)2I2 possesses ultra-small interlayer spacing, additional interlayer nano channels, which is thus beneficial for charge transport ability. The planar heterojunction solar cell based on Cs2Pb(SCN)2I2 as the light absorber, has presented the highest power conversion efficiency among long-chain-cation-based 2D perovskite devices. Besides, the Cs2Pb(SCN)2I2-based photodetector also exhibits much higher photodetection performance (i.e. quantum efficiency, on/off ratio, responsivity, detectivity, response speed, polarization sensitivity and detection stability). It is thus suggested that these outstanding photoelectric characteristics of Cs2Pb(SCN)2I2 could bring huge opportunities for its more abundant optoelectronic applications, such as field-effect transistor and light-emitting diodes.
摘要
硫氰酸根阴离子(SCN)钙钛矿材料由于拥有独特的晶格和电子性能使其成为光电应用中诱人的二维(2D)材料系统. 由此, 我们研究了2D结构Cs2Pb(SCN)2I2材料的光伏和光电探测性能. 与常规的阳离子2D钙钛矿材料相比, Cs2Pb(SCN)2I2具有极小的层间间距和额外的层间纳米通道, 从而大大提高了电荷传输能力. 对比所有基于长链阳离子的单纯2D钙钛矿器件, 以Cs2Pb(SCN)2I2作为光吸收层的平面异质结太阳能电池表现出最高的光电转换效率. 此外, 基于Cs2Pb(SCN)2I2的光电探测器表现出更高的光电探测EQE、 开/关比、 响应度、 探测率、 响应速度、 偏振灵敏度以及更优异的光电稳定性. 所有这些出色的光电特性为SCN钙钛矿材料在更丰富的光电应用领域(例如: 场效应晶体管和发光二极管等)提供了巨大机遇.
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Acknowledgements
This work was supported by the National Key R&D Program of China (2018YFB1500101), the National Natural Science Foundation of China (11874402, 51421002, 51627803, 91733301 and 51761145042), and the International Partnership Program of Chinese Academy of Sciences (112111KYSB20170089).
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Author contributions Li Y, Shi J and Meng Q conceived the idea. Li Y performed the device fabrication and measurements. Shi J designed the experiment and did the photophysical measurements. Li Y and Shi J did the data analysis. Li D, Luo Y and Wu H supported the measurement system construction, device fabrication, characterization and discussion. Li Y, Shi J and Meng Q participated in manuscript writing and revising. Shi J and Li D polished the language. All the authors were involved in the discussion and approved the manuscript. Li Y and Shi J contributed equally to this work.
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Yiming Li received the BS degree from Nankai University in 2015. She is now a PhD candidate in condensed matter physics at the Institute of Physics, Chinese Academy of Sciences (CAS) under the supervision of Prof. Qingbo Meng. Her research interests focus on charge carrier dynamics and charge loss mechanism in new-generation solar cells.
Jiangjian Shi obtained his PhD degree from the Institute of Physics, CAS in 2017. Now, he is an associate professor at the Institute of Physics, CAS. His research interest includes investigation on charge carrier dynamics, interfacial charge transfer and surface modification in new-generation solar cells.
Qingbo Meng is now a professor at the Institute of Physics, CAS. He received his PhD degree in 1997 from Changchun Institute of Applied Chemistry, CAS. His current research interest focuses on solar energy materials and technologies as well as the research of the dynamics of electron injection, diffusion and recombination in solar cells.
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Ultra-Small Interlayer Spacing and Nano Channels in Anionic Layered Perovskite Cs2Pb(SCN)2I2 Enable Efficient Photoelectric Conversion
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Li, Y., Shi, J., Wu, H. et al. Ultra-small interlayer spacing and nano channels in anionic layered perovskite Cs2Pb(SCN)2I2 enable efficient photoelectric conversion. Sci. China Mater. 64, 61–72 (2021). https://doi.org/10.1007/s40843-020-1326-3
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DOI: https://doi.org/10.1007/s40843-020-1326-3