Toward Stable Monolithic Perovskite/Silicon Tandem Photovoltaics: A Six-Month Outdoor Performance Study in a Hot and Humid Climate
Toward Stable Monolithic Perovskite/Silicon Tandem Photovoltaics: A Six-Month Outdoor Performance Study in a Hot and Humid Climate
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DOI：
10.1021/acsenergylett.1c01018
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发表时间：
2021-07-30
影响因子：
22
通讯作者：
De Wolf, Stefaan
中科院分区：
文献类型：
--
作者：
De Bastiani, Michele;Van Kerschaver, Emmanuel;De Wolf, Stefaan
多晶硅/硅叠层太阳能电池是一种高效率和具有成本效益的太阳能技术，在公用事业规模上具有很大的应用前景。然而，尽管最近报道了显着的性能进步，但确保足够的器件稳定性-特别是钙钛矿顶电池-仍然是实现实际影响的挑战。在这项工作中，我们通过在沙特阿拉伯进行现场测试，分析了封装的双面钙钛矿/硅串联的户外性能。经过六个月的实验，我们发现开路电压保持其初始值，而填充因子下降，这被发现有两个原因。第一种降解机制与钙钛矿中的离子迁移有关，并且在很大程度上在一夜之间是可逆的，尽管它确实会随着时间的推移引起滞后行为。第二种不可逆的机理是由银金属顶部接触的腐蚀引起的，其中形成了银。这些发现为设计新的更稳定的钙钛矿/硅串联体提供了方向
Perovskite/silicon tandem solar cells are emerging as a high-efficiency and prospectively cost-effective solar technology with great promise for deployment at the utility scale. However, despite the remarkable performance progress reported lately, assuring sufficient device stability-particularly of the perovskite top cell-remains a challenge on the path to practical impact. In this work, we analyze the outdoor performance of encapsulated bifacial perovskite/silicon tandems, by carrying out field-testing in Saudi Arabia. Over a six month experiment, we find that the open circuit voltage retains its initial value, whereas the fill factor degrades, which is found to have two causes. A first degradation mechanism is linked with ion migration in the perovskite and is largely reversible overnight, though it does induce hysteretic behavior over time. A second, irreversible, mechanism is caused by corrosion of the silver metal top contact with the formation of silver iodide. These findings provide directions for the design of new and more stable perovskite/silicon tandems