Scholarlink

<p>The scope of current photovoltaic (PV) qualification standards is limited, as polymeric backsheets often pass initial ultraviolet (UV) and thermal certification tests yet still exhibit premature cracking in arid or high-altitude environments. This limitation arises from the decoupled evaluation of thermal degradation and mechanical integrity in current qualification protocols. While thermal exposure accelerates thermo-oxidative degradation, mechanically induced defects can further facilitate subsequent degradation during thermal aging. Here, the synergistic degradation of PV backsheets subjected to sequential mechanical damage and thermal aging is systematically investigated. The results indicate that&#xa0;mechanically induced surface defects provide preferential regions for subsequent degradation during thermal aging. Under electrical stress, these degraded regions are associated with regulated charge trapping behavior, enhanced partial discharge (PD) activity, and reduced breakdown strength. Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) analyses further characterize the chemical and microstructural evolution during the degradation process. These findings clarify the relationship between microstructural evolution and electrical degradation in polymeric materials under multi-stress conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermo-mechanical degradation-induced charge trapping and electrical deterioration in photovoltaic backsheets

  • 期刊论文

  • 发表日期：

    2026年7月29日

查看全文
  • Kai Feng,
  • Jia-Wei Zhang,
  • Shuai-Qi Li,
  • Sombel Diaham,
  • Fouad Belhora,
  • Abdelowahed Hajjaji,
  • Chatchai Putson

摘要

The scope of current photovoltaic (PV) qualification standards is limited, as polymeric backsheets often pass initial ultraviolet (UV) and thermal certification tests yet still exhibit premature cracking in arid or high-altitude environments. This limitation arises from the decoupled evaluation of thermal degradation and mechanical integrity in current qualification protocols. While thermal exposure accelerates thermo-oxidative degradation, mechanically induced defects can further facilitate subsequent degradation during thermal aging. Here, the synergistic degradation of PV backsheets subjected to sequential mechanical damage and thermal aging is systematically investigated. The results indicate that mechanically induced surface defects provide preferential regions for subsequent degradation during thermal aging. Under electrical stress, these degraded regions are associated with regulated charge trapping behavior, enhanced partial discharge (PD) activity, and reduced breakdown strength. Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) analyses further characterize the chemical and microstructural evolution during the degradation process. These findings clarify the relationship between microstructural evolution and electrical degradation in polymeric materials under multi-stress conditions.