研究目的
To determine experimentally the optical limits of a solar cell coupled to a photonic crystal acting as beam splitter, focusing on the angular dependence of the irradiation source, irradiation spectrum, and polarization of the light.
研究成果
The research demonstrated that the optical coupling between 1DPC and solar cells is highly dependent on the incident angle of the irradiation, with significant performance drops observed for angles beyond 50°. The study highlights the importance of considering these factors in the design phase to optimize the performance of photovoltaic devices integrated with photonic crystals.
研究不足
The study identified that for incident angles higher than 50°, the Bragg peak position shifted significantly, and its profile was distorted, leading to reduced performance. The polarization of light also affected the device's performance, but to a lesser extent than the incident angle.
1：Experimental Design and Method Selection:
The study involved designing and manufacturing a one-dimensional photonic crystal (1DPC) to act as a back reflector for a solar cell. The optical coupling performance was analyzed under both indoor and outdoor conditions, considering the incident angle, solar spectrum distribution, and light polarization.
2：Sample Selection and Data Sources:
A silicon solar cell was coupled with a 1DPC, and a similar solar cell without 1DPC was used as a reference. Data were collected under controlled indoor conditions and real outdoor conditions in Seville, Spain.
3：List of Experimental Equipment and Materials:
Equipment included a UV-VIS spectrometer, spectroscopic ellipsometer, mechanical profilometer, and meteorological station for environmental monitoring. Materials included SiO2 and TiO2 for the 1DPC layers.
4：Experimental Procedures and Operational Workflow:
The 1DPC was characterized for its optical properties under varying incident angles. The photovoltaic performance of the solar cell with and without 1DPC was monitored continuously under outdoor conditions.
5：Data Analysis Methods:
The optical coupling losses were calculated based on photocurrent measurements. The Bragg peak position and transparency were analyzed as functions of the incident angle.
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