Zun-Hao Shih

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.