%0 Journal Article %1 ADMA:ADMA201702184 %A Tang, Zheng %A Ma, Zaifei %A Sánchez-Díaz, Antonio %A Ullbrich, Sascha %A Liu, Yuan %A Siegmund, Bernhard %A Mischok, Andreas %A Leo, Karl %A Campoy-Quiles, Mariano %A Li, Weiwei %A Vandewal, Koen %D 2017 %J Advanced Materials %K crystals fullerene photodetector polymere %N 33 %P n/a--n/a %R 10.1002/adma.201702184 %T Polymer:Fullerene Bimolecular Crystals for Near-Infrared Spectroscopic Photodetectors %U http://dx.doi.org/10.1002/adma.201702184 %V 29 %X Spectroscopic 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 poly2,5-bis(3-tetradecylthiophen-2-yl)thieno3,2-bthiophene (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.

@article{ADMA:ADMA201702184, abstract = {Spectroscopic 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.}, added-at = {2017-09-18T14:53:22.000+0200}, author = {Tang, Zheng and Ma, Zaifei and Sánchez-Díaz, Antonio and Ullbrich, Sascha and Liu, Yuan and Siegmund, Bernhard and Mischok, Andreas and Leo, Karl and Campoy-Quiles, Mariano and Li, Weiwei and Vandewal, Koen}, biburl = {https://www.bibsonomy.org/bibtex/2586d96af5c3739367a222aef1811bd6e/fabianopkm}, doi = {10.1002/adma.201702184}, interhash = {8b79320f1d7acc4578453c10b15cdf35}, intrahash = {586d96af5c3739367a222aef1811bd6e}, issn = {1521-4095}, journal = {Advanced Materials}, keywords = {crystals fullerene photodetector polymere}, number = 33, pages = {n/a--n/a}, timestamp = {2017-09-18T14:53:22.000+0200}, title = {Polymer:Fullerene Bimolecular Crystals for Near-Infrared Spectroscopic Photodetectors}, url = {http://dx.doi.org/10.1002/adma.201702184}, volume = 29, year = 2017 }