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Poly(vinylidene fluoride-co-hexafluoropropylene) additive in perovskite for stable performance of carbon-based perovskite solar cells
International Journal of Energy Research ( IF 4.6 ) Pub Date : 2021-09-09 , DOI: 10.1002/er.7270
Santhosh Narendhiran 1 , Acchutharaman Kunka Ravindran 1 , Isaac Daniel Rajan Thomas 1 , Senthil Pandian Muthu 1 , Ramasamy Perumalsamy 1
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The efficiency of perovskite devices is depending on the crystallization process with a controlled microstructure. Perovskite precursors with polymer additive significantly improve the perovskite film crystallinity, large grain boundaries, serve as passivating defect sites yielding increased power conversion efficiency (PCE). In this study, we improved the hole-transport free carbon-based perovskite solar cells by using polymer additive to passivate the perovskite grains with large size crystal and assist to grow with the preferred orientation of the polycrystalline perovskite layer. The polymer additive systematically alters the morphology of the perovskite films. The perovskite with polymer additives exhibited reduced trap density, which could enhance the open-circuit voltage. The fluoro-polymer as an additive into perovskite layer facilitated a hydrogen bond with organic cation to form H-F bond, which could prevent degradation from moisture. The solar device with 5 wt% PVDF-HFP additives achieved ~14% improvement in open-circuit voltage and yielded a PCE of 11.11%. Moreover, the shelf-life of the solar device retains 86% from its original efficiency with a period of 30 days (stored under ambient condition, 60%-70% humidity). It is revealing that the fluoro-polymer enhances the passivation of perovskite grains and gives a hope in perovskite photovoltaics.

中文翻译:

钙钛矿中的聚偏二氟乙烯-共六氟丙烯添加剂用于碳基钙钛矿太阳能电池的稳定性能

钙钛矿器件的效率取决于具有受控微观结构的结晶过程。具有聚合物添加剂的钙钛矿前体显着提高了钙钛矿薄膜的结晶度、大晶界、作为钝化缺陷位点,从而提高了功率转换效率(PCE)。在这项研究中,我们通过使用聚合物添加剂来钝化具有大尺寸晶体的钙钛矿晶粒并协助多晶钙钛矿层的择优取向生长,从而改进了空穴传输的无碳基钙钛矿太阳能电池。聚合物添加剂系统地改变了钙钛矿薄膜的形态。具有聚合物添加剂的钙钛矿表现出降低的陷阱密度,这可以提高开路电压。含氟聚合物作为钙钛矿层的添加剂,促进了与有机阳离子的氢键形成HF键,从而防止水分降解。具有 5 wt% PVDF-HFP 添加剂的太阳能器件的开路电压提高了约 14%,PCE 为 11.11%。此外,太阳能设备的保质期在 30 天(在环境条件下,湿度 60%-70% 下储存)内保持其原始效率的 86%。它揭示了氟聚合物增强了钙钛矿晶粒的钝化,并为钙钛矿光伏带来了希望。太阳能设备的保质期在 30 天(环境条件下,湿度 60%-70% 下储存)内保持其原始效率的 86%。它揭示了氟聚合物增强了钙钛矿晶粒的钝化,并为钙钛矿光伏带来了希望。太阳能设备的保质期在 30 天(环境条件下,湿度 60%-70% 下储存)内保持其原始效率的 86%。它揭示了氟聚合物增强了钙钛矿晶粒的钝化,并为钙钛矿光伏带来了希望。
更新日期:2021-09-09
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