%0 Journal Article %1 Kim_2021 %A Kim, Jin Hong %A Liess, Andreas %A Stolte, Matthias %A Krause, Ana-Maria %A Stepanenko, Vladimir %A Zhong, Chuwei %A Bialas, David %A Spano, Frank %A Würthner, Frank %D 2021 %I Wiley %J Adv. Mater. %K myown %N 26 %P 2100582 %R 10.1002/adma.202100582 %T An Efficient Narrowband Near-Infrared at 1040nm Organic Photodetector Realized by Intermolecular Charge Transfer Mediated Coupling Based on a Squaraine Dye %U https://doi.org/10.1002%2Fadma.202100582 %V 33 %X 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 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.

@article{Kim_2021, abstract = {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 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.}, added-at = {2021-07-05T11:34:59.000+0200}, author = {Kim, Jin Hong and Liess, Andreas and Stolte, Matthias and Krause, Ana-Maria and Stepanenko, Vladimir and Zhong, Chuwei and Bialas, David and Spano, Frank and Würthner, Frank}, biburl = {https://www.bibsonomy.org/bibtex/290f1f4661f40bbfff9909a80804df1c7/wuerthner_group}, doi = {10.1002/adma.202100582}, interhash = {ee1edbdbdff18f9f9bd0f43a27acf4ea}, intrahash = {90f1f4661f40bbfff9909a80804df1c7}, journal = {Adv. Mater.}, keywords = {myown}, month = may, number = 26, pages = 2100582, publisher = {Wiley}, timestamp = {2021-12-16T09:55:22.000+0100}, title = {An Efficient Narrowband Near-Infrared at 1040nm Organic Photodetector Realized by Intermolecular Charge Transfer Mediated Coupling Based on a Squaraine Dye}, url = {https://doi.org/10.1002%2Fadma.202100582}, volume = 33, year = 2021 }