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Polymer:Fullerene Bimolecular Crystals for Near‐Infrared Spectroscopic Photodetectors

AuthorsZheng, Tang; Sánchez Díaz, Antonio; Campoy Quiles, Mariano CSIC ORCID ; Vandewal, Koen
KeywordsBimolecular crystals
Cavity photodetectors
Miniature spectrometers
Tunable spectra
Wavelength selectivity
Issue Date6-Sep-2017
CitationAdvanced Materials 29(33): 1702184 (2017)
AbstractSpectroscopic photodetection is a powerful tool in disciplines such as medical diagnosis, industrial process monitoring, or agriculture. However, its application in novel fields, including wearable and biointegrated electronics, is hampered by the use of bulky dispersive optics. Here, solution‐processed organic donor–acceptor blends are employed in a resonant optical cavity device architecture for wavelength‐tunable photodetection. While conventional photodetectors respond to above‐gap excitation, the cavity device exploits weak subgap absorption of intermolecular charge‐transfer states of the intercalating poly[2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b]thiophene] (PBTTT):[6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) bimolecular crystal. This enables a highly wavelength selective, near‐infrared photoresponse with a spectral resolution down to 14 nm, as well as dark currents and detectivities comparable with commercial inorganic photodetectors. Based on this concept, a miniaturized spectrophotometer, comprising an array of narrowband cavity photodetectors, is fabricated by using a blade‐coated PBTTT:PCBM thin film with a thickness gradient. As an application example, a measurement of the transmittance spectrum of water by this device is demonstrated.
DescriptionZheng, Tang et al.
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