Refine
Has Fulltext
- yes (6)
Is part of the Bibliography
- yes (6)
Document Type
- Journal article (5)
- Doctoral Thesis (1)
Keywords
- Merocyanine (2)
- crystal engineering (2)
- exciton coupling (2)
- organic photodiodes (2)
- squaraine dyes (2)
- Aggregat <Chemie> (1)
- Chromophore Assembly (1)
- Exciton Coupling (1)
- Exziton (1)
- Exzitonenkopplung (1)
- Heteroaggregate (1)
- Heteroaggregates (1)
- J-aggregates (1)
- J‐aggregates (1)
- Nucleic Acids (1)
- Nucleobase Analogue (1)
- Perylenderivate (1)
- Supramolecular Chemistry (1)
- Supramolecular Element (1)
- Supramolekulare Chemie (1)
- cooperative self-assembly (1)
- merocyanines (1)
- nanorods and nanosheets (1)
- near-infrared sensitivity (1)
- organic chemistry (1)
- organic solar cells (1)
- polymorphism (1)
- quantum chemical analysis (1)
- supramolecular polymers (1)
Institute
EU-Project number / Contract (GA) number
- 682586 (1)
A highly sensitive short-wave infrared (SWIR, λ > 1000 nm) organic photodiode (OPD) is described based on a well-organized nanocrystalline bulk-heterojunction (BHJ) active layer composed of a dicyanovinyl-functionalized squaraine dye (SQ-H) donor material in combination with PC\(_{61}\)BM. Through thermal annealing, dipolar SQ-H chromophores self-assemble in a nanoscale structure with intermolecular charge transfer mediated coupling, resulting in a redshifted and narrow absorption band at 1040 nm as well as enhanced charge carrier mobility. The optimized OPD exhibits an external quantum efficiency (EQE) of 12.3% and a full-width at half-maximum of only 85 nm (815 cm\(^{-1}\)) at 1050 nm under 0 V, which is the first efficient SWIR OPD based on J-type aggregates. Photoplethysmography application for heart-rate monitoring is successfully demonstrated on flexible substrates without applying reverse bias, indicating the potential of OPDs based on short-range coupled dye aggregates for low-power operating wearable applications.