Flexible photodiodes based on nitride core/shell p-n junction nanowires
Development of wearable UVA sensors operating without external polarization is today an important societal challenge. In addition to high sensitivity and spectral selectivity, wearable UV sensors need to be lightweight and flexible in order to be easily incorporated in skin patches or integrated on clothes. Autonomous operation without external bias is also an important requirement for this application. We demonstrated flexible nitride nanowire p-n photodiodes selectively detecting UVA radiation. The device consisted of a composite nanowire/polymer membrane transferred onto a flexible substrate. Fully flexible transparent contacts based on a silver nanowire network were used for device fabrication, which allows bending the detector to a few millimeter curvature radius without damage. The detector showed a photoresponse at wavelengths shorter than 430 nm with a peak responsivity of 0.096 A/W under zero bias.
•Hezhi Zhang, Xing Dai, Nan Guan, Agnes Messanvi, Vladimir Neplokh, Valerio Piazza, Martin Vallo, Catherine Bougerol, François H Julien, Andrey Babichev, Nicolas Cavassilas, Marc Bescond, Fabienne Michelini, Martin Foldyna, Eric Gautier, Christophe Durand, Joël Eymery, Maria Tchernycheva, « Flexible Photodiodes Based on Nitride Core/Shell p–n Junction Nanowires », ACS Applied Materials & Interfaces 8 (39), 26198-26206 (2016)