Rectification in metal-semiconductor-metal detectors used as optoelectronic mixers

Paul H. Shen; Keith Aliberti; Michael R. Stead; William C. Ruff; Barry L. Stann

doi:10.1117/12.478855

5 August 2002 Rectification in metal-semiconductor-metal detectors used as optoelectronic mixers

Paul H. Shen, Keith Aliberti, Michael R. Stead, William C. Ruff, Barry L. Stann

Author Affiliations +

Proceedings Volume 4721, Infrared Detectors and Focal Plane Arrays VII; (2002) https://doi.org/10.1117/12.478855
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Variation in rectification current with ac-bias frequency has recently been observed in metal-semiconductor-metal (MSM) detectors when utilized as optoelectronic mixers in a frequency-modulated continuous-wave (FM/cw) LADAR System. This current degrades the performance of the LADAR System by inducing false targets. In this paper, we present a detailed experimental and theoretical investigation on the origin of this current. We find that MSM detectors exhibit asymmetric current-voltage characteristics that are related to imperfections in device design and processing. We also find that, although the asymmetry is usually small, a rectification current may exist even under zero mean ac bias. Both the dark current and the photocurrent exhibit asymmetric behavior, but have opposite asymmetry with respect to one another. Under transient bias voltage the device shows two transient current responses: (1) a fast one related to the displacement current and (2) a slow one related to the removal of carriers from the device. The asymmetry in current related to the slow process is opposite to the dc asymmetry, while the asymmetry in current related to the fast process is more symmetric. The rectification current varies not only with ac voltage and optical power, but also with ac bias frequency.

Citation Download Citation

Paul H. Shen, Keith Aliberti, Michael R. Stead, William C. Ruff, and Barry L. Stann "Rectification in metal-semiconductor-metal detectors used as optoelectronic mixers", Proc. SPIE 4721, Infrared Detectors and Focal Plane Arrays VII, (5 August 2002); https://doi.org/10.1117/12.478855

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE