Silicon based near infrared photodetector using self-assembled organic crystalline nano-pillars

Yoshiharu Ajiki, Tetsuo Kan, Masayuki Yahiro, Akiko Hamada, Junji Adachi, Chihaya Adachi, Kiyoshi Matsumoto, Isao Shimoyama

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We propose a silicon (Si) based near-infrared photodetector using self-assembled organic crystalline nano-pillars, which were formed on an n-type Si substrate and were covered with an Au thin-film. These structures act as antennas for near-infrared light, resulting in an enhancement of the light absorption on the Au film. Because the Schottky junction is formed between the Au/n-type Si, the electron excited by the absorbed light can be detected as photocurrent. The optical measurement revealed that the nano-pillar structures enhanced the responsivity for the near-infrared light by 89 (14.5 mA/W) and 16 (0.433 mA/W) times compared with those of the photodetector without nano-pillars at the wavelengths of 1.2 and 1.3 μm, respectively. Moreover, no polarization dependency of the responsivity was observed, and the acceptable incident angle ranged from 0°to 30°. These broad responses were likely to be due to the organic nano-pillar structures' having variation in their orientation, which is advantageous for near-infrared detector uses.

Original languageEnglish
Article number151102
JournalApplied Physics Letters
Volume108
Issue number15
DOIs
Publication statusPublished - Apr 11 2016

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photometers
silicon
infrared detectors
electromagnetic absorption
optical measurement
photocurrents
antennas
augmentation
polarization
thin films
wavelengths
electrons

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Silicon based near infrared photodetector using self-assembled organic crystalline nano-pillars. / Ajiki, Yoshiharu; Kan, Tetsuo; Yahiro, Masayuki; Hamada, Akiko; Adachi, Junji; Adachi, Chihaya; Matsumoto, Kiyoshi; Shimoyama, Isao.

In: Applied Physics Letters, Vol. 108, No. 15, 151102, 11.04.2016.

Research output: Contribution to journalArticle

Ajiki, Y, Kan, T, Yahiro, M, Hamada, A, Adachi, J, Adachi, C, Matsumoto, K & Shimoyama, I 2016, 'Silicon based near infrared photodetector using self-assembled organic crystalline nano-pillars', Applied Physics Letters, vol. 108, no. 15, 151102. https://doi.org/10.1063/1.4945690
Ajiki, Yoshiharu ; Kan, Tetsuo ; Yahiro, Masayuki ; Hamada, Akiko ; Adachi, Junji ; Adachi, Chihaya ; Matsumoto, Kiyoshi ; Shimoyama, Isao. / Silicon based near infrared photodetector using self-assembled organic crystalline nano-pillars. In: Applied Physics Letters. 2016 ; Vol. 108, No. 15.
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