Highly efficient perovskite solar cells for light harvesting under indoor illumination via solution processed SnO2/MgO composite electron transport layers
Highly efficient perovskite solar cells for light harvesting under indoor illumination via solution processed SnO2/MgO composite electron transport layers
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DOI：
10.1016/j.nanoen.2018.04.027
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发表时间：
2018-07-01
期刊：
影响因子：
17.6
通讯作者：
Brown, Thomas M.
中科院分区：
文献类型：
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作者：
Dagar, Janardan;Castro-Hermosa, Sergio;Brown, Thomas M.
我们提出了基于CH3NH3PbI3的平面钙钛矿太阳能电池的新架构，其中包含溶液处理的SnO2/MgO复合电子传输层，在典型的200-400 lx室内照明条件下，光伏电池显示出最高的功率输出。当在白色欧司朗LED灯（200,400 lx）下测量时，200 lx下的最大功率密度值为20.2亩W/cm(2)（估计功率转换效率，PCE = 25.0%）， 400 lx下的最大功率密度值为41.6亩W/cm(2) (PCE = 26.9%)，与仅使用SnO2层的太阳能电池相比，相当于增加了20%（即使在标准1太阳照明下，最大PCE为19.0%）。薄的氧化石墨烯覆盖层使薄膜更加均匀，减少了界面载流子复合，提高了稳定性。除了两个电极外，电池的所有层都在低温下进行溶液处理，以降低处理成本。此外，与严格的室外条件相比，室内环境代表了一个更温和的环境，因为这项技术仍在寻找商业出路，也是出于对稳定性的考虑。这里展示的无与伦比的性能为钙钛矿太阳能电池为未来室内电子设备（例如智能自主室内无线传感器网络，物联网等）的供电做出了巨大贡献铺平了道路。
We present new architectures in CH3NH3PbI3 based planar perovskite solar cells incorporating solution processed SnO2/MgO composite electron transport layers that show the highest power outputs ever reported for photovoltaic cells under typical 200-400 lx indoor illumination conditions. When measured under white OSRAM LED lamp (200, 400 lx), the maximum power density values were 20.2 mu W/cm(2) (estimated power conversion efficiency, PCE = 25.0%) at 200 lx and 41.6 mu W/cm(2) (PCE = 26.9%) at 400 lx which correspond to a similar to 20% increment compared to solar cells with a SnO2 layer only (even at standard 1 sun illumination, where the maximum PCE was 19.0%). The thin MgO overlayer leads to more uniform films, reduces interfacial carrier recombination, and leads to better stability. All layers of the cells, except for the two electrodes, are solution processed at low temperatures for low cost processing. Furthermore, ambient indoor conditions represent a milder environment compared to stringent outdoor conditions for a technology that is still looking for a commercial outlet also due to stability concerns. The unparalleled performance here demonstrated, paves the way for perovskite solar cells to contribute strongly to the powering of the indoor electronics of the future (e.g. smart autonomous indoor wireless sensor networks, internet of things etc).