Doctor-blade deposition of quantum dots onto standard window glass for low-loss large-area luminescent solar concentrators

作者：Li, Hongbo; Wu, Kaifeng; Lim, Jaehoon; Song, Hyung-Jun; Klimov, Victor I.^*

来源：Nature Energy, 2016, 1(12): 16157.

DOI：10.1038/NENERGY.2016.157

• SILICA SPHERES
• STOKES-SHIFT
• SHELL
• NANOCRYSTALS
• BRIGHT
• ENERGY
• PERFORMANCE
• THICKNESS
• DEVICES

Luminescent solar concentrators (LSCs) are envisioned to reduce the cost of solar electricity by decreasing the usage of more expensive photovoltaic (PV) materials and diminishing the complexity of multi-cell PV modules. The LSC concept can also enable unconventional solar-energy conversion devices such as PV windows that can be especially useful in highly populated urban areas. Here we demonstrate low-loss, large-area (up to about 90 x 30 cm(2)) LSCs fabricated from colloidal core/shell quantum dots (QDs) whose optical spectra are tailored so as to minimize self-absorption of waveguided radiation. For improved compatibility with a polymer matrix and enhanced stability, QDs are encapsulated into silica shells, which allows for maintaining high emission efficiencies (similar to 70% quantum yields) under four-month exposure to air and light, and heat treatments up to 200 degrees C. The QD/polymer composites are processed into devices using standard doctor-blade deposition onto commercial window glasses. The fabricated semi-transparent devices demonstrate internal quantum efficiencies of more than 10% for dimensions of tens of centimetres.

• 出版日期2016-10-10