Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.092
Publication date: 23rd September 2021
A strategy to artificially widen the linear dynamic range (LDR) of an organic photodiode (OPD) by introducing a light-intensity-dependent transition of its operation mode, such that a low saturation photocurrent can be overcome by additional operation mechanism, is suggested. The active layer of OPD is doped with a strategically designed and synthesized molecular switch (1,2-bis-(2-methyl-5-(4-cyanobiphenyl)-3-thienyl)tetrafluorobenzene; DAB), exhibiting typical OPD performances with an EQE < 100% under weak light and photoconductive behaviors with an EQE > 100% under strong light, which leads to an artificially extended LDR up to 225 dB. Such unique and reversible transition of the operation mode by light intensity self-recognition of molecular-switch-embedded OPDs can be explained by the unbalanced quantum yield of the cyclization-cycloreversion of the molecular switch. Details of the operation mechanism are discussed in conjunction with various photophysical analyses. A prototype image sensor based on wide-LDR OPDs is suggested to demonstrate superior sensitivity against strong light illumination.
This work was supported by Samsung Research Funding & Incubation Center of Samsung Electronics under Project Number SRFC-TA1803-01.
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