期刊
ADVANCED MATERIALS
卷 33, 期 26, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202100582
关键词
crystal engineering; J‐ aggregates; near‐ infrared sensitivity; organic photodiodes; squaraine dyes
类别
资金
- Bavarian Ministry of Education, Science and the Arts
- research program Solar Technologies Go Hybrid
- KeyLab for Supramolecular Polymer of the Bavarian Polymer Institute
- National Science Foundation [DMR-1810838]
- Projekt DEAL
By carefully designing the nanocrystalline active layer, the efficient short-wave infrared organic photodiode (OPD) achieves high sensitivity and narrow absorption band width, showing potential in applications such as heart rate monitoring.
A highly sensitive short-wave infrared (SWIR, lambda > 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 PC61BM. 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.
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