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Related Experiment Video

Updated: Jul 7, 2026

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System

Published on: July 18, 2015

Spectrally Engineered Coatings for Steering the Solar Photons.

Quan Gong¹, Jianheng Chen¹, Yijie Zhang¹

¹Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

Advanced Materials (Deerfield Beach, Fla.)

|April 26, 2025

Summary

This study introduces a novel radiative cooling (RC) coating integrated with bifacial photovoltaic (biPV) panels. This dual-harvesting system boosts solar power generation by 32% and enhances cooling efficiency.

Keywords:

bifacial photovoltaic building energy carbon neutral cities photoluminescence radiative cooling coating

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Published on: March 2, 2021

Area of Science:

Sustainable Energy
Materials Science
Optics

Background:

Photovoltaic (PV) and radiative cooling (RC) systems face inefficiencies due to spectral mismatches with solar radiation.
PV panels experience non-photovoltaic heat losses, while RC systems waste reflected solar energy.

Purpose of the Study:

To develop a spectrally selective photoluminescent radiative cooling coating for integration with bifacial photovoltaic (biPV) panels.
To enhance the efficiency of both energy generation and cooling through a dual-harvesting system.

Main Methods:

Development of a photoluminescent RC coating with spectrally selective reflectivity.
Integration of the RC coating with biPV panels to optimize photon utilization.
Suppression of non-radiative transitions in photoluminescent materials to convert absorbed photons into luminescence.

Main Results:

Achieved a 32% increase in the overall power output of the bifacial PV system.
Reduced effective solar absorption by 14%, enhancing radiative cooling performance.
Demonstrated potential to meet approximately 18.1% of Hong Kong's annual electricity demand via simulated urban rooftop deployment.

Conclusions:

The integrated dual-harvesting system offers a scalable solution for improving solar energy conversion and radiative cooling.
This technology presents a promising pathway toward achieving carbon-neutral cities through enhanced renewable energy utilization.