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Chin. Phys. B, 2014, Vol. 23(3): 038506    DOI: 10.1088/1674-1056/23/3/038506
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Zero-bias high-responsivity high-bandwidth top-illuminated germanium p–i–n photodetectors

Li Chong (李冲), Xue Chun-Lai (薛春来), Liu Zhi (刘智), Cheng Bu-Wen (成步文), Li Chuan-Bo (李传波), Wang Qi-Ming (王启明)
State Key Laboratory on Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
Abstract  We report efficient zero-bias high-speed top-illuminated p–i–n photodiodes (PDs) with high responsivity fabricated with germanium (Ge) films grown directly on silicon-on-insulator (SOI) substrates. For a 15 μm-diameter device at room temperature, the dark current density was 44.1 mA/cm2 at –1 V. The responsivity at 1.55 μm was 0.30 A/W at 0 V. The saturation of the optical responsivity at 0 V bias revealed that this photodetector allows a complete photo-generated carrier collection without bias. Although the 3-dB bandwidth of the 15-μ-diameter detector was 18.8 GHz at the reverse bias of 0 V, the detector responsivity was improved by one order of magnitude compared with that reported in the literature. Moreover, the dark current of the detector was significantly reduced.
Keywords:  germanium      photodetectors      integrated optoelectronics      optical interconnections  
Received:  20 July 2013      Revised:  13 August 2013      Accepted manuscript online: 
PACS:  85.60.Gz (Photodetectors (including infrared and CCD detectors))  
  95.55.Aq (Charge-coupled devices, image detectors, and IR detector arrays)  
  85.30.De (Semiconductor-device characterization, design, and modeling)  
  42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?)  
Corresponding Authors:  Xue Chun-Lai     E-mail:  clxue@semi.ac.cn

Cite this article: 

Li Chong (李冲), Xue Chun-Lai (薛春来), Liu Zhi (刘智), Cheng Bu-Wen (成步文), Li Chuan-Bo (李传波), Wang Qi-Ming (王启明) Zero-bias high-responsivity high-bandwidth top-illuminated germanium p–i–n photodetectors 2014 Chin. Phys. B 23 038506

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