ScholarWorks@성균관대학교

초록

Colloidal quantum dots (CQDs) are promising candidates for next-generation infrared optoelectronics. While maximizing external quantum efficiency-a key figure of merit for photodetectors and photovoltaics-requires both enhanced light absorption and efficient carrier extraction, the former has received comparatively less attention. This work presents a framework for tailoring the optical properties of CQD films to engineer enhanced absorption in optoelectronic devices. Using effective-medium theory, we discuss how the complex refractive index of CQD films can be modeled and how their optical constants can be systematically related to the quantum dot size, ligand length, and shape. Employing transfer-matrix method calculations, we show how to optimize multilayer stacks by utilizing Fabry-Perot resonances to maximize absorption. We also present methods to mitigate parasitic losses that limit the absorptance. This framework helps to diagnose whether the device performance is limited by absorption or by carrier extraction and guides research directions toward overcoming these limits. Finally, we discuss the limitations of current theoretical models and propose future directions for extending these principles to emerging optoelectronic applications.

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