Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells
Light and oxygen induced degradation limits the operational stability of methylammonium lead triiodide perovskite solar cells
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DOI：
10.1039/c6ee00409a
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发表时间：
2016-01-01
影响因子：
32.5
通讯作者：
Haque, Saif A.
中科院分区：
文献类型：
--
作者：
Bryant, Daniel;Aristidou, Nicholas;Haque, Saif A.
在这里，我们证明了光和氧诱导的降解是暴露于环境条件下的甲基铵三碘化铅（MeNH 3 PbI 3）钙钛矿太阳能电池的低操作稳定性的主要原因。当暴露于光和干燥空气时，未封装的MeNH 3 PbI 3太阳能电池在几分钟到几小时的时间尺度上迅速退化。这种快速降解也观察到电偏置驱动电流下，在黑暗中的O-2的存在下。相比之下，当MeNH 3 PbI 3器件仅暴露于湿气（例如，在N-2中85%的相对湿度）时，观察到明显较慢的降解。我们表明，这种光和氧诱导的降解可以通过使用能够在钙钛矿膜与氧反应形成O-2（-）之前从钙钛矿膜中去除电子的夹层来减缓。这些观察结果表明，利用MeNH 3 PbI 3的电子传输特性的电子和光电器件的操作稳定性将严重依赖于使用合适的阻挡层和器件配置来减轻这种显着材料的氧敏感性。
Here, we demonstrate that light and oxygen-induced degradation is the main reason for the low operational stability of methylammonium lead triiodide (MeNH3PbI3) perovskite solar cells exposed to ambient conditions. When exposed to both light and dry air, unencapsulated MeNH3PbI3 solar cells rapidly degrade on timescales of minutes to a few hours. This rapid degradation is also observed under electrically bias driven current flow in the dark in the presence of O-2. In contrast, significantly slower degradation is observed when the MeNH3PbI3 devices are exposed to moisture alone (e.g. 85% relative humidity in N-2). We show that this light and oxygen induced degradation can be slowed down by the use of interlayers that are able to remove electrons from the perovskite film before they can react with oxygen to form O-2(-). These observations demonstrate that the operational stability of electronic and optoelectronic devices that exploit the electron transporting properties of MeNH3PbI3 will be critically dependent upon the use of suitable barrier layers and device configurations to mitigate the oxygen sensitivity of this remarkable material.