Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection
Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection
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DOI：
10.1021/acsanm.9b00069
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发表时间：
2019-03-01
影响因子：
5.9
通讯作者：
Ko, Dong-Kyun
中科院分区：
文献类型：
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作者：
Hafiz, Shihab B.;Scimeca, Michael R.;Ko, Dong-Kyun
最近发现的具有四方晶体结构的银硒化银（Ag 2 Se）胶体量子点在中波长红外区表现出良好的光学性质。虽然最近已经研究了均匀尺寸和形状的胶体合成以及详细的相变和光致发光特性，但对其作为光电探测器器件中的有源层的光电特性的研究仍然很少。在此，我们提出了银硒胶体量子点为基础的光电导光电探测器的制造和表征。我们研究了配体交换以及温度和光谱依赖的光响应的影响。我们的研究结果表明，可以通过精确控制载流子浓度来实现性能的进一步提高。通过这种改进，Ag2Se胶体量子点可以作为一种有前途的中波长红外吸收剂，用于开发具有低尺寸、重量、功耗和成本的热红外传感器和成像器。
Lately discovered silver selenide (Ag2Se) colloidal quantum dots with tetragonal crystal structure exhibit promising optical properties in the mid-wavelength infrared. Although colloidal synthesis of uniform sizes and shapes as well as detailed phase transformation and photoluminescence properties have been studied recently, investigations of their optoelectronic properties as an active layer in photodetector devices remain scarce. Herein, we present the fabrication and characterization of Ag2Se colloidal quantum dot-based photoconductive photodetectors. We investigate the effect of ligand exchange as well as temperature and spectral-dependent photoresponses. Our results suggest that further enhancement in performance could be achieved through accurate control of carrier concentration. With this improvement, Ag2Se colloidal quantum dots may serve as a promising mid wavelength infrared absorber for the development of thermal infrared sensors and imagers with low size, weight, power consumption, and cost.