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Abstract
High‐performance uncooled photodetectors operating in the long‐wavelength infrared and terahertz regimes are highly demanded in the military and civilian fields. Photothermoelectric (PTE) detectors, which combine photothermal and thermoelectric conversion processes, can realize ultra‐broadband photodetection without the requirement of a cooling unit and external bias. In the last few decades, the responsivity and speed of PTE‐based photodetectors have made impressive progress with the discovery of novel thermoelectric materials and the development of nanophotonics. In particular, by introducing hot‐carrier transport into low‐dimensional material–based PTE detectors, the response time has been successfully pushed down to the picosecond level. Furthermore, with the assistance of surface plasmon, antenna, and phonon absorption, the responsivity of PTE detectors can be significantly enhanced. Beyond the photodetection, PTE effect can also be utilized to probe exotic physical phenomena in spintronics and valleytronics. Herein, recent advances in PTE detectors are summarized, and some potential strategies to further improve the performance are proposed.
大連化物所發(fā)表光熱電探測(cè)器研究綜述文章 長(zhǎng)波紅外（8-14μm）和太赫茲（30μm-3mm）探測(cè)器由于其在多領(lǐng)域有重要作用而受到廣泛關(guān)注。光熱電探測(cè)器是基于光熱轉(zhuǎn)換和熱電轉(zhuǎn)換兩個(gè)物理過程，可實(shí)現(xiàn)長(zhǎng)波紅外和太赫茲室溫探測(cè)的無源器件，在長(zhǎng)波紅外和太赫茲探測(cè)方面發(fā)揮越來越重要的作用。該綜述文章系統(tǒng)介紹了近年來基于低維材料、體相多孔材料和有機(jī)材料的光熱電探測(cè)器的研究進(jìn)展，從增強(qiáng)光與材料相互作用的角度，總結(jié)了提高光熱電探測(cè)器響應(yīng)能力的若干策略，包括引入表面等離子體共振、聲子共振、光學(xué)天線等。此外，文章拓展介紹了光熱電效應(yīng)在近場(chǎng)光學(xué)、自旋電子學(xué)和谷電子學(xué)等領(lǐng)域中的應(yīng)用。最后，文章還展望了光熱電探測(cè)器的進(jìn)一步發(fā)展方向。 姜鵬和包信和團(tuán)隊(duì)長(zhǎng)期致力于開發(fā)新型熱電材料，并拓寬熱電材料的應(yīng)用范圍。該團(tuán)隊(duì)利用高熵化策略提高GeSe晶體結(jié)構(gòu)對(duì)稱性，大幅度提高了該材料的熱電性能（Angew. Chem. Int. Ed.，2017 ）；結(jié)合多種微納尺度表征手段，探究納米熱電材料的載流子分布（Adv. Electron. Mater.，2017 ）和表面等離子共振性質(zhì)（Nano Lett.，2018 ）；結(jié)合鈦酸鍶在長(zhǎng)波紅外波段強(qiáng)的聲子吸收和優(yōu)異的塞貝克系數(shù)，開發(fā)了基于鈦酸鍶光熱電效應(yīng)的高性能長(zhǎng)波紅外探測(cè)器（Nat. Commun. ，2019）。  上述工作得到國(guó)家重點(diǎn)研發(fā)計(jì)劃、大連化物所創(chuàng)新基金等的資助，并于近日發(fā)表在《先進(jìn)材料》（Advanced Materials）上。 鏈接地址：https://onlinelibrary.wiley.com/doi/full/10.1002/adma.201902044?campaign=wolearlyview |