Ultraviolet Photodetectors With Narrow-Band Spectral Response Using TAPC Donor

Organic ultraviolet photodetectors (PDs) with a narrow-band spectral response are fabricated. TAPC and PBD were utilized as the electron donor and acceptor, respectively. Glass/indium tin oxide (ITO) was employed as the anode contact and the incident light window. The PDs reveal a narrow response width of 30 nm at 316-346 nm. A peak response of 0.12 A/W at 330 nm and a photo-to-dark ratio of about 1.1 ×10
²
under 330-nm light illumination with an intensity of 0.95 mW/cm
²
were achieved. The realization of the narrow-band response should be ascribed to the steep absorption of organic materials at the long wavelength and the blocking role of glass/ITO contact at the short wavelength.