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Ultra-sensitive tandem colloidal quantum-dot photodetectors. 2015
Zhenyu Jiang, and
Wenjia Hu, and
Chen Mo, and
Yan Liu, and
Wenjun Zhang, and
Guanjun You, and
Li Wang, and
Mahmoud R M Atalla, and
Yu Zhang, and
Jie Liu, and
Kandhar K Kurhade, and
Jian Xu
Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16802, USA. jianxu@engr.psu.edu.
The solution-processed PbSe colloidal quantum-dot (CQD) infrared photodetector with tandem architecture is proposed to address the high dark current issue. The electrical transport mechanism in tandem has been fundamentally changed in which the recombination of carriers at an intermediate layer becomes dominant rather than carriers hopping between nearest neighbors in CQD materials. As a result, the tandem photodetector exhibits ultra-high detectivities of 4.7 × 10(13) Jones and 8.1 × 10(13) Jones under 34 μW cm(-2) illumination at 1100 nm, at 275 K and 100 K, respectively.
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