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Paper Abstract and Keywords
Presentation 2022-11-11 09:30
[Invited Talk] Toward Super Temporal Resolution by Suppression of Mixing Effects of Electrons
Takeharu Goji Etoh (Osaka Univ.), Kazuhiro Shimonomura, Taeko Ando, Yoshiyuki Matsunaga, Yutaka Hirose (Ritsumeikan Univ.), Takayoshi Shimura, Heiji Watanabe (Osaka Univ.), Yoshinari Kamakura (OIT), Hideki Mutoh (Link Research) SDM2022-71
Abstract (in Japanese) (See Japanese page) 
(in English) The theoretical temporal resolution limit of silicon (Si) image sensors is 11.1 ps. The super temporal resolution (STR) is defined as a frame interval less than this limit. The temporal resolution of burst image sensors is significantly affected by “mixing” of signal electrons traveling from different starting positions. For example, the penetration depths of photons incident to a surface of a photodiode (PD) disperse exponentially, resulting in mixing of the photoelectrons generating at distributed depths and arriving at the other end of the PD. The temporal resolution is proportional to the standard deviation of the arrival time. Toward the STR imaging, this paper proposes measures to suppress various mixing phenomena during the travel of the signal electrons: (1) a germanium photodiode (Ge PD) for visible light to practically eliminate the effect of the vertical mixing caused by the distribution of the penetration depth, (2) an inverted pyramid PD to suppress the horizontal mixing, keeping a 100% fill factor, (3) a standard column PD with an negative potential on the vertical walls to squeeze the trajectory bundle of electrons falling on the center gate on the front side, (4) vertical transfer gates surrounding the PD, and (5) a resistive center gate to linearize the potential profile to maximize the horizontal drift velocity to minimize the mixing together with the squeezed electron bundle.
Keyword (in Japanese) (See Japanese page) 
(in English) High-speed Image sensor / Super temporal resolution / Pyramid photodiode / Resistive gate / Germanium / vertical transfer gate / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 247, SDM2022-71, pp. 32-39, Nov. 2022.
Paper # SDM2022-71 
Date of Issue 2022-11-03 (SDM) 
ISSN Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SDM  
Conference Date 2022-11-10 - 2022-11-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Process, Device, Circuit simulation, etc. 
Paper Information
Registration To SDM 
Conference Code 2022-11-SDM 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Toward Super Temporal Resolution by Suppression of Mixing Effects of Electrons 
Sub Title (in English)  
Keyword(1) High-speed Image sensor  
Keyword(2) Super temporal resolution  
Keyword(3) Pyramid photodiode  
Keyword(4) Resistive gate  
Keyword(5) Germanium  
Keyword(6) vertical transfer gate  
1st Author's Name Takeharu Goji Etoh  
1st Author's Affiliation Osaka University (Osaka Univ.)
2nd Author's Name Kazuhiro Shimonomura  
2nd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
3rd Author's Name Taeko Ando  
3rd Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
4th Author's Name Yoshiyuki Matsunaga  
4th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
5th Author's Name Yutaka Hirose  
5th Author's Affiliation Ritsumeikan University (Ritsumeikan Univ.)
6th Author's Name Takayoshi Shimura  
6th Author's Affiliation Osaka University (Osaka Univ.)
7th Author's Name Heiji Watanabe  
7th Author's Affiliation Osaka University (Osaka Univ.)
8th Author's Name Yoshinari Kamakura  
8th Author's Affiliation Osaka Institute of Technology (OIT)
9th Author's Name Hideki Mutoh  
9th Author's Affiliation Link Research Corporation (Link Research)
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Speaker Author-1 
Date Time 2022-11-11 09:30:00 
Presentation Time 60 minutes 
Registration for SDM 
Paper # SDM2022-71 
Volume (vol) vol.122 
Number (no) no.247 
Page pp.32-39 
Date of Issue 2022-11-03 (SDM) 

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