Transparent Organic Photodetector using a Near-Infrared Absorbing Cyanine Dye

• Published in: Scientific reports Vol. 5; no. 1; p. 9439
• Main Authors: Zhang, Hui, Jenatsch, Sandra, De Jonghe, Jelissa, Nüesch, Frank, Steim, Roland, Véron, Anna C., Hany, Roland
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 24-03-2015; Nature Publishing Group
• Subjects: 132/122; 639/301/1005; 639/624/399; Circuits; Color; Electrodes; Fabrication; Humanities and Social Sciences; I.R. radiation; Irradiation; Light; multidisciplinary; Optics; Photovoltaic cells; Science; Sensors; Wavelength
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/srep09439

Organic photodetectors are interesting for low cost, large area optical sensing applications. Combining organic semiconductors with discrete absorption bands outside the visible wavelength range with transparent and conductive electrodes allows for the fabrication of visibly transparent photodetectors. Visibly transparent photodetectors can have far reaching impact in a number of areas including smart displays, window-integrated electronic circuits and sensors. Here, we demonstrate a near-infrared sensitive, visibly transparent organic photodetector with a very high average visible transmittance of 68.9%. The transmitted light of the photodetector under solar irradiation exhibits excellent transparency colour perception and rendering capabilities. At a wavelength of 850 nm and at −1 V bias, the photoconversion efficiency is 17% and the specific detectivity is 10
12
Jones. Large area photodetectors with an area of 1.6 cm
2
are demonstrated.