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a) Schematic device structure, energy level diagram, and spectrally resolved EQE with the absorption of NIR OPDs. Reproduced under the terms of the CC‐BY 4.0 international license.[ 99 ]Copyright 2017, The Authors. Published by Springer Nature. b) The schematic device structure of resonant‐cavity‐enhanced OPDs and a photograph of a proof‐of‐concept miniature spectrometer. Reproduced with permission.[ 100 ] Copyright 2017, Wiley‐VCH.
