Color-Filter-Free Three-Layer-Stacked Image Sensor Using Blue/Green-Selective Organic Photoconductive Films with Thin-Film Transistor Circuits on CMOS Image Sensors

• Published in: ACS applied electronic materials Vol. 3; no. 7; pp. 3085 - 3095
• Main Authors: Sakai, Toshikatsu, Takagi, Tomomi, Imamura, Koki, Mineo, Keitada, Yakushiji, Hidenori, Hashimoto, Yuta, Aotake, Tatsuya, Sadamitsu, Yuichi, Sato, Hiroto, Aihara, Satoshi
• Format: Journal Article
• Language: English
• Published: American Chemical Society 27.07.2021
• Subjects: image sensor; three-layer-stacked structure; photoconductive film; thin-film transistor; organic
• ISSN: 2637-6113; 2637-6113
• DOI: 10.1021/acsaelm.1c00310

In this paper, we describe a three-layer-stacked color image sensor comprising two organic photoconductive films (OPFs) with thin-film transistor-based readout circuits and a complementary metal–oxide–semiconductor (CMOS) image sensor. In this three-layer-stacked sensor, a blue-sensitive OPF selectively absorbs blue light, a green-sensitive OPF selectively absorbs green light, and a CMOS image sensor (CIS) receives red light. Color video imaging operation at 60 frames per second was confirmed for a prototype sensor having 320 × 240 pixels with a pixel pitch of 20 μm without a color filter array, and good color separation and a linear response of the sensor were achieved owing to the combination of the CIS and color-selective OPFs.