writer：Shuang Qiu
keywords：fame retardant, luminescent downshifting layer, polyvinyl chloride, solar energy, UV-resistance
source：期刊
Issue time：2024年

Solar power generation, as a clean energy source, has significant potential for development. This work reports the recent efforts to address the challenge of low power conversion efficiency in photovoltaic devices by proposing the fabrication of a luminescence downshifting layer using polyvinyl chloride (PVC) with added fluorescent dots to enhance light utilization. A photoluminescent microsphere (HCPAM) is synthesized by cross‐linking hexachlorocyclotriphosphazene, 2‐iminobenzimidazoline, and polyethyleneimine. Low addition of HCPAM can improve the fire safety of PVC films, raising the limiting oxygen index of PVC to 32.4% and reducing the total heat release and smoke production rate values by 14.5% and 42.9%, respectively. Additionally, modified PVC film remains a transparency of 88% and shows down‐conversion light properties. When the PVC+1%HCPAM film is applied to the solar cell, the short‐circuit current density increases from 42.3 to 43.8 mA cm^?2,resulting in a 7.0% enhancement in power conversion efficiency. HCPAM also effectively delays the photooxidative aging of PVC, particularly at a 3% content, maintaining the surface morphology and optical properties of PVC samples during ultraviolet aging. This study offers an innovative strategy to enhance the fire and UV‐resistant performance of PVC films and expand their applications in protecting and efficiently utilizing photovoltaic devices.

太阳能发电作为清洁能源，具有巨大的发展潜力。这项工作报告了最近为解决光伏器件中低功率转换效率的挑战所做的努力，提出使用添加荧光点的聚氯乙烯（PVC）制造发光降频层以提高光利用率。光致发光微球（HCPAM）是通过交联六氯环三磷腈、2-亚氨基苯并咪唑啉和聚乙烯亚胺合成的。低添加量的HCPAM可提高PVC薄膜的防火安全性，使PVC的极限氧指数提高至32.4%，总放热量和产烟率值分别降低14.5%和42.9%。此外，改性PVC 薄膜仍保持 88% 的透明度，并显示出下转换光特性。当PVC+1%HCPAM薄膜应用于太阳能电池时，短路电流密度从42.3 mA cm^-2增加到43.8 mA cm ^?2 ，使电源转换效率提高7.0%。HCPAM还有效延缓PVC的光氧化老化，特别是在3%含量时，在紫外线老化过程中保持PVC样品的表面形貌和光学性能。这项研究提供了一种创新策略，可以增强PVC 薄膜的防火和抗紫外线性能，并扩大其在保护和有效利用光伏设备方面的应用。