Hwen-Fen Hong

Single stage transmission type broadband solar concentrator

In this paper, a single stage solar cell concentrator is designed and discussed. The proposed concentrator consists of refraction prisms and total internal reflection prisms in the inner and outer areas, respectively. In order to compensate for dispersion, all odd zones gather the light onto the -D position, while all even zones gather the light onto the + D position. Finally, the hybrid concentrator achieves optical efficiency of 89.8% for normally incident light without an antireflection coating. An acceptance angle of +/- 0.78 degree at 1 dB loss is achieved without using additional secondary optics. In addition, the fabrication tolerance is also analyzed.

Transmissive color filtering using plasmonic multilayer structure

A transmission type plasmonic multilayer filter is theoretically investigated using three-dimensional rigorous coupled wave analysis (RCWA) method. The design rule of the resonance properties associated with the weakly localized surface plasmon modes in metal/insulator/metal waveguide arrays is discussed. The optical performances with respect to the geometrical parameters of the plasmonic structure are evaluated. Through manipulating the geometric parameters of the metal/insulator/metal waveguide, the optical properties of the filter can be engineered.

Characteristic and comparison of different submounts on concentrating photovoltaic module

High concentration photovoltaics systems employ concentrating optics consisting of dish reflectors or fresnel lenses that concentrate sunlight to 500 suns or more. In general, under concentrating light operation condition, the device temperature rises quickly and the open-circuit voltage of solar cell will decrease with increasing temperature; therefore, the system output power or energy-conversion efficiency will decrease while temperature of solar cell increased. In this study, we analyze the ceramic thermal resistance and propose a direct temperature measurement method of the solar cell. The direct temperature measurement of the cell and the ceramic was achieved by utilizing buried thermocouples with a diameter of 50 μm between the cell/ceramic and aluminum plate. The different light flux densities ranging from 500 to 800 W/m2 at 100 W/m2 interval by solar simulator are provided to measure temperature, and the cell temperatures measured are 39.8 °C, 41 °C, 45 °C and 48 °C, respectively. The temperature...

New Packing Structure of Concentration Solar Receiver

This paper presents a solution to the temperature issue in High Concentration Photovoltaic (HCPV) module device by using different thermal conductive material and packing structure. In general, the open‐circuited voltage of a device reduces with the increase of temperature and therefore degrades its efficiency. The thermal conductive material we use in this paper, silicon, has a high thermal conductive coefficient (149 W/m⋅K) and steady semiconductor properties which are suitable for the application of solar receiver in HCPV module. Solar cell was soldered on a metal‐plated Si substrate with a thicker SiO2 film which acts as an insulating layer. Then it was mounted on an Al‐based plate to obtain a better heat dissipating result.