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    Colloidal quantum dot (CQD) solar cells can now be precisely colored and made transparent using thin film interference. This breakthrough enables custom-designed optoelectronic devices with controlled spectral profiles and high photocurrents.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Renewable Energy

    Background:

    • Colloidal quantum dots (CQDs) offer tunable band gaps and solution processability for solar cells.
    • Existing CQD solar cells primarily focus on electrical properties, with limited exploration of spectral tuning beyond absorption onset.

    Purpose of the Study:

    • To design, optimize, and fabricate multicolored and transparent CQD devices.
    • To explore spectral tunability using thin film interference engineering.
    • To develop an optimization algorithm for controlled color characteristics in CQD devices.

    Main Methods:

    • Thin film interference engineering was employed to control spectral properties.
    • An optimization algorithm was developed to achieve desired color characteristics.
    • Fabrication of blue, green, yellow, red, and semitransparent CQD devices.

    Main Results:

    • Achieved photocurrents of 10–15.2 mA/cm² for colored CQD devices.
    • Demonstrated semitransparent devices with 27–32% average visible transparency, matching simulations.
    • Quantified tradeoffs between color/transparency and photocurrent.

    Conclusions:

    • Thin film interference engineering enables custom spectral profiles in CQD devices.
    • The developed optimization method is a versatile platform for designing optoelectronic devices.
    • This approach expands the application of CQDs in colored and transparent solar cells.