Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells.
Thermomechanical Lift-Off and Recontacting of CdTe Solar Cells.
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CdTe 太阳能电池的热机械剥离和重新接触。
DOI：
10.1021/acsami.8b16476
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发表时间：
2018
影响因子：
9.5
通讯作者：
M. Reese
中科院分区：
文献类型：
--
作者：
D. McGott;M. Kempe;Stephen Glynn;N. Bosco;T. Barnes;N. Haegel;C. Wolden;M. Reese
薄膜光伏 (PV) 生长后的受控分层可以揭示对器件性能至关重要的界面，但由于它们在器件堆栈中难以访问，人们对这些界面知之甚少。在这项工作中，我们演示了一种以清洁、可重复的方式将薄膜太阳能电池从玻璃基板上剥离的技术，首先将聚合物背板层压到设备上，然后在低温（T ≤ -30 °C）下对系统进行热冲击。为了实现不同薄膜结构的清洁分层，开发了理论框架并确定了关键过程控制参数。重点关注碲化镉 (CdTe) 器件，我们表明层压温度和器件架构控制剥离质量，而薄膜叠层去除的速率则由分层温度控制。无裂纹的 CdTe 器件被移除并成功重新接触，恢复了高达 80% 的原始器件效率。这些器件的面密度为 ∼0.4 kg m-2，相对于它们在玻璃上的初始重量减少了一个数量级以上。这里开发的框架为开发具有高比功率的廉价、灵活光伏以及研究薄膜结构中先前埋入的界面提供了一条途径。
Controlled delamination of thin-film photovoltaics (PV) post-growth can reveal interfaces that are critical to device performance yet are poorly understood because of their inaccessibility within the device stack. In this work, we demonstrate a technique to lift off thin-film solar cells from their glass substrates in a clean, reproducible manner by first laminating a polymeric backsheet to the device and then thermally shocking the system at low temperatures ( T ≤ -30 °C). To enable clean delamination of diverse thin-film architectures, a theoretical framework is developed and key process control parameters are identified. Focusing on cadmium telluride (CdTe) devices, we show that the lamination temperature and device architecture control the quality of lift-off, while the rate at which the film stack is removed is controlled by the delamination temperature. Crack-free CdTe devices are removed and successfully recontacted, recovering up to 80% of the original device efficiency. The areal density of these devices is ∼0.4 kg m-2, a reduction of over an order of magnitude relative to their initial weight on glass. The framework developed here provides a pathway toward both the development of inexpensive, flexible PV with high specific power and the study of previously buried interfaces in thin-film architectures.