Tang Xin, Ackerman Matthew M, Shen Guohua, Guyot-Sionnest Philippe
James Franck Institute, University of Chicago, IL, 60637, USA.
Department of Chemistry, University of Chicago, IL, 60637, USA.
Small. 2019 Mar;15(12):e1804920. doi: 10.1002/smll.201804920. Epub 2019 Feb 15.
Electronic eye cameras are receiving increasing interest due to their unique advantages such as wide field of view, low aberrations, and simple imaging optics compared to conventional planar focal plane arrays. However, the spectral sensing ranges of most electronic eyes are confined to the visible, which is limited by the energy gaps of the sensing materials and by fabrication obstacles. Here, a potential route leading to infrared electronic eyes is demonstrated by exploring flexible colloidal quantum dot (CQD) photovoltaic detectors. Benefitting from their tunable optical response and the ease of fabrication as solution processable materials, mercury telluride (HgTe) CQD detectors with mechanical flexibility, wide spectral sensing range, fast response, and high detectivity are demonstrated. A strategy is provided to further enhance the light absorption in flexible detectors by integrating a Fabry-Perot resonant cavity. Integrated short-wave IR detectors on flexible substrates have peak D of 7.5 × 10 Jones at 2.2 µm at room temperature and promise the development of infrared electronic eyes with high-resolution imaging capability. Finally, infrared images are captured with the flexible CQD detectors at varying bending conditions, showing a practical approach to sensitive infrared electronic eyes beyond the visible range.
与传统平面焦平面阵列相比，电子眼相机因其独特优势，如宽视场、低像差和简单的成像光学系统，而受到越来越多的关注。然而，大多数电子眼的光谱传感范围局限于可见光，这受到传感材料的能隙和制造障碍的限制。在此，通过探索柔性胶体量子点（CQD）光伏探测器，展示了一条通往红外电子眼的潜在途径。受益于其可调谐的光学响应以及作为可溶液加工材料易于制造的特点，展示了具有机械柔韧性、宽光谱传感范围、快速响应和高探测率的碲化汞（HgTe）CQD探测器。通过集成法布里-珀罗谐振腔，提供了一种进一步增强柔性探测器光吸收的策略。柔性基板上集成的短波红外探测器在室温下于2.2 µm处的峰值探测率为7.5×10琼斯，并有望开发出具有高分辨率成像能力的红外电子眼。最后，使用柔性CQD探测器在不同弯曲条件下拍摄红外图像，展示了一种超越可见光范围的灵敏红外电子眼的实用方法。
