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A bending test protocol for characterizing the mechanical performance of flexible photovoltaics
Nature Energy ( IF 49.7 ) Pub Date : 2024-10-18 , DOI: 10.1038/s41560-024-01651-2
Kenjiro Fukuda, Lulu Sun, Baocai Du, Masahito Takakuwa, Jiachen Wang, Takao Someya, Lluis F. Marsal, Yinhua Zhou, Yiwang Chen, Hongzheng Chen, S. Ravi P. Silva, Derya Baran, Luigi A. Castriotta, Thomas M. Brown, Changduk Yang, Weiwei Li, Anita W. Y. Ho-Baillie, Thomas Österberg, Nitin P. Padture, Karen Forberich, Christoph J. Brabec, Osbel Almora

Flexible photovoltaic (PV) devices are a promising research field with potential for wearable, portable, indoor and internet-of-things applications. Substantial progress has been made in recent years, with flexible emerging PVs reporting power conversion efficiencies (PCEs) of over 24%. Yet, there is a need for a unifying protocol to assess PV performance, compare research results, and evaluate state-of-the-art achievements in flexible PVs. Here we present a protocol for measuring PCE over 1,000 bending cycles under 1% strain. Moreover, several good practice guidelines are proposed, including those related to bending procedures, flexibility testing with and without encapsulation, and ambient conditions during testing (for example, temperature, humidity and illumination). Notably, the importance of the uniform application of the bending radius and the testing of parallel and perpendicular orientations of the bending axis with respect to the direction of the electric current are emphasized. These recommendations aim to promote consistency in device comparison and allow for better reproducibility.



中文翻译:


用于表征柔性光伏机械性能的弯曲测试协议



柔性光伏 (PV) 器件是一个前景广阔的研究领域,具有可穿戴、便携式、室内和物联网应用的潜力。近年来取得了重大进展,灵活的新兴光伏报告称功率转换效率 (PCE) 超过 24%。然而,需要一个统一的协议来评估 PV 性能、比较研究结果并评估柔性 PV 的最新成就。在这里,我们提出了一种在 1% 应变下测量 1,000 次弯曲循环的 PCE 的协议。此外,还提出了几项良好实践指南,包括与弯曲程序、有和无封装的柔韧性测试以及测试期间的环境条件(例如,温度、湿度和照明)相关的指南。值得注意的是,强调了弯曲半径的均匀应用以及弯曲轴相对于电流方向的平行和垂直方向测试的重要性。这些建议旨在促进设备比较的一致性并实现更好的可重复性。

更新日期:2024-10-19
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