Self-Driven Perovskite/Organic Quasi-Tandem Photodetectors Operating in Both Narrowband and Broadband Regimes

• Published in: ACS applied materials & interfaces Vol. 16; no. 38; pp. 51212 - 51220
• Main Authors: Teng, Huaxiao, Zhang, Yu, Zhu, Ziqi, Song, Dandan, Qiao, Bo, Liang, Zhiqin, Xu, Zheng, Zhao, Suling
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 25.09.2024
• Subjects: Organic Electronic Devices; dual-band photodetector; quasi-tandem; self-driven; perovskite/organic; carrier-selective transmission narrowing
• ISSN: 1944-8244; 1944-8252; 1944-8252
• DOI: 10.1021/acsami.4c06953

Dual-band photodetectors (PDs) have attracted extensive research attention due to their great potential for diverse and refreshing application scenarios in full-color imaging, optical communication, and imaging detection. Here, a self-driven dual-band PD without filters and other auxiliary equipment to achieve a narrowband response in Mode 1 and a broadband response in Mode 2 was designed based on carrier-selective transmission narrowing (CSTN). The polymer material poly­[bis­(4-phenyl)­(2,4,6-trimethylphenyl)­amine] (PTAA), which has the appropriate energy level, was selected to be the carrier-selective transmission layer. In Mode 1, the dual-band PD exhibits a near-infrared (NIR) narrowband response in 750–900 nm, which indicates a responsivity of 360 mA/W, a full-width at half-maximum (fwhm) of 81 nm, and a specific detectivity (D*) of 7.49 × 1010 Jones at 810 nm. Simultaneously, in Mode 2, the dual-band PD exhibits a UV–visible–NIR broadband responsivity of 180 mA/W and a specific detectivity (D*) of 3.8 × 1010 Jones at 520 nm. Our study provides a reliable idea for the commercial applications of dual-function photodetectors.