Gao Liang, Chen Chao, Zeng Kai, Ge Cong, Yang Dun, Song Haisheng, Tang Jiang
Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.
Light Sci Appl. 2016 Jul 29;5(7):e16126. doi: 10.1038/lsa.2016.126. eCollection 2016 Jul.
Photodetectors convert photons into current or voltage outputs and are thus widely used for spectroscopy, imaging and sensing. Traditional photodetectors generally show a consistent-polarity response to incident photons within their broadband responsive spectrum. Here we introduced a new type of photodetector employing SnS nanosheets sensitized with PbS colloidal quantum dots (CQDs) that are not only sensitive (~10 A W) and broadband (300-1000 nm) but also spectrally distinctive, that is, show distinctive (positive or negative) photoresponse toward incident photons of different wavelengths. A careful mechanism study revealed illumination-modulated Schottky contacts between SnS nanosheets and Au electrodes, altering the photoresponse polarity toward incident photons of different wavelengths. Finally, we applied our SnS nanosheet/PbS CQDs hybrid photodetector to differentiate the color temperature of emission from a series of white light-emitting diodes (LEDs), showcasing the unique application of our novel photodetectors.
光电探测器将光子转换为电流或电压输出，因此被广泛应用于光谱学、成像和传感领域。传统光电探测器在其宽带响应光谱范围内，通常对入射光子表现出一致极性的响应。在此，我们介绍了一种新型光电探测器，它采用了由硫化铅胶体量子点（CQD）敏化的硫化锡纳米片，这种探测器不仅灵敏（~10 A W）且宽带（300 - 1000 nm），而且在光谱上具有独特性，即对不同波长的入射光子表现出独特的（正或负）光响应。经过仔细的机理研究发现，硫化锡纳米片与金电极之间存在光照调制的肖特基接触，这改变了对不同波长入射光子的光响应极性。最后，我们将硫化锡纳米片/硫化铅CQD混合光电探测器应用于区分一系列白色发光二极管（LED）发射光的色温，展示了我们新型光电探测器的独特应用。
