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Hybrid Black Phosphorus/Zero-Dimensional Quantum Dot Phototransistors: Tunable Photodoping and Enhanced Photoresponsivity

Hybrid Black Phosphorus/Zero-Dimensional Quantum Dot Phototransistors: Tunable Photodoping and Enhanced Photoresponsivity
Lee, A-YoungRa, Hyun-SooKwak, Do-HyunJeong, Min-HyePark, Jeong-HyunKang, Yeon-SuChae, Weon-SikLee, Jong-Soo
Issued Date
ACS Applied Materials & Interfaces, v.10, no.18, pp.16033 - 16040
Author Keywords
phototransistorhybrid BP/QDsphotodopingblack phosphorusquantum dots
Recently, black phosphorus (BP) with direct band gap exhibited excellent potential for optoelectronic applications because of its high charge carrier mobility and low dark current as well as the variable band gap of 0.3-1.5 eV depending on the number of layers. However, few-layer BP-based phototransistors (photo-FETs) have been limited in sensitivity and wavelength selectivity. To overcome the drawback of these photo-FETs, we studied hybrid photo-FETs combined with the novel properties of the two materials between the channel and sensitizer layers. By combining a strong absorbance of a quantum dot (QD) layer and a two-dimensional layer material with high carrier mobility, the hybrid photo-FETs are expected to produce high-performance photodetectors that can effectively control the responsivity, detectivity, and response time. In this study, we demonstrate that the photogenerated carriers formed from QD sensitizer layers migrate to the BP transport layer with high charge mobility and not only improve the photodetector performance but also enhance the photodoping effect of the BP transport layer with an ambipolar characteristic by electrons transferred from n-type CdSe QDs or holes injected from p-type PbS QDs. The responsivity and detectivity of hybrid BP/0D photo-FETs exhibit 1.16 × 109 A W-1 and 7.53 × 1016 Jones for the BP/CdSe QD photo-FET and 5.36 × 108 A W-1 and 1.89 × 1016 Jones for the BP/PbS QD photo-FET, respectively. The photocurrent rise (δrise) and decay (δdecay) times were δrise = 0.406 s and δdecay = 0.815 s for BP/CdSe QD photo-FET and δrise = 0.576 s and δdecay = 0.773 s for BP/PbS QD photo-FET, respectively. © 2018 American Chemical Society.
American Chemical Society
Related Researcher
  • 이종수 Lee, Jong-Soo 에너지공학과
  • Research Interests Design of new type of multifunctional nanoparticles for energy-related devices; 다기능성 나노재료; 무기물 태양전지; 열전소자
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Department of Energy Science and Engineering MNEDL(Multifunctional Nanomaterials & Energy Devices Lab) 1. Journal Articles


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