Study of Light-and elevated Temperature-induced Degradation (LeTID) of PV Module technology based on the Passivated Emitter and Rear Cell (PERC)

Photovoltaic power systems continuously grow in Thailand which has 3,939 MWp installation capacity in 2020. According to the Alternative Energy Development Plan (AEDP) of Thailand as the latest issue is AEDP2018 its target for solar energy (Electricity) is 12,139 MWp. The trend of photovoltaic power systems installation growth in ASEAN such as Vietnam, and Malaysia. The opportunity to extend this market occurs in the installation operation and maintenance sector.  

Crystalline Silicon technology is shared the most in the photovoltaic market due to its high efficiency and reliability. Moreover, the development to improve their efficiency is continuously working. One of the latest is Passivated Emitter and Rear Contact (PERC) which has higher efficiency but the same cost as commercial PV module. This PV technology was applied in PV power plants in Thailand since last 10 years ago. The focus is on the degradation of the PERC module caused by light and high temperature namely light- and elevated temperature-induced degradation (LeTID). The academic report shows that lack the degradation mechanism of the PERC module.   

The international standard of the International Electrotechnical Commission (IEC) will announce the test procedure of LeTID. The preparation of knowledge about LeTID for PV module testing facility needs to Thai private sector and public services which is one of support to sustainable development goals. This study aims to investigate the electricity parameters and microstructure of PERC as well as the kinetic rate of PERC degradation. The benefit of the results is to support the extent of the PV power market in Thailand and other countries of ASEAN.