pp. 435-444
S&M694 Research Paper Published: 2007 Optical Characteristics of an N-Well/Gate-Tied PMOSFET-type Photodetector with Built-in Transfer Gate for CMOS Image Sensor [PDF] Sang-Ho Seo, Kyoung-Do Kim, Min-Woong Seo, Jae-Sung Kong, Jang-Kyoo Shin and Pyung Choi (Received July 4, 2007; Accepted September 27, 2007) Keywords: photodetector, PMOSFET, built-in transfer gate, CMOS image sensor
In this study, a new n-well/gate-tied p-channel metal-oxide-semiconductor field-effect transistor (PMOSFET)-type photodetector with a built-in transfer gate has been designed and fabricated using 0.35 μm standard complementary metal oxide semiconductor (CMOS) technology. This photodetector is composed of a floating gate that is tied to an n-well and a built-in transfer gate. The built-in transfer gate controls the photocurrent flow by controlling the barrier for holes in the proposed photodetector. The designed and fabricated photodetector exhibits IDS-VDS characteristics that are similar to those of a general MOSFET when the incident light power, instead of the gate voltage, is varied. The area of the proposed photodetector is 3.8 × 5.7 μm and the responsivity is greater than 2.5 × 102 A/W, at a wavelength of 633 nm.
Corresponding author: Jang-Kyoo ShinCite this article Sang-Ho Seo, Kyoung-Do Kim, Min-Woong Seo, Jae-Sung Kong, Jang-Kyoo Shin and Pyung Choi, Optical Characteristics of an N-Well/Gate-Tied PMOSFET-type Photodetector with Built-in Transfer Gate for CMOS Image Sensor, Sens. Mater., Vol. 19, No. 7, 2007, p. 435-444. |