Perovskite Solar Cells with Large-Area CVD-Graphene for Tandem Solar Cells
Perovskite Solar Cells with Large-Area CVD-Graphene for Tandem Solar Cells
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DOI：
10.1021/acs.jpclett.5b01177
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发表时间：
2015-07-16
影响因子：
5.7
通讯作者：
Nickel, Norbert H.
中科院分区：
文献类型：
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作者：
Lang, Felix;Gluba, Marc A.;Nickel, Norbert H.
具有透明触点的钙钛矿太阳能电池可用于补偿硅太阳能电池在串联器件中的热化损失。这为提高停滞不前的效率提供了一条途径。然而，串联结构的钙钛矿顶部电池需要具有高导电性和最佳透明度的接触层。我们采用化学气相沉积法生长大面积石墨烯作为钙钛矿太阳能电池的高透明电极，从而实现了相同的电荷收集效率，从而解决了这一挑战。石墨烯触点太阳能电池的电性能达到了标准金触点太阳能电池的电性能。光透射率远远超过参考器件，比钙钛矿带隙低64.3%。最后，我们展示了一个四端串联装置，结合了高带隙石墨烯接触钙钛矿顶部太阳能电池（E-g = 1.6 eV）和非晶/晶体硅底部太阳能电池（E-g = 1.12 eV）。
Perovskite solar cells with transparent contacts may be used to compensate for thermalization losses of silicon solar cells in tandem devices. This offers a way to outreach stagnating efficiencies. However, perovskite top cells in tandem structures require contact layers with high electrical conductivity and optimal transparency. We address this challenge by implementing large-area graphene grown by chemical vapor deposition as a highly transparent electrode in perovskite solar cells, leading to identical charge collection efficiencies. Electrical performance of solar cells with a graphene-based contact reached those of solar cells with standard gold contacts. The optical transmission by far exceeds that of reference devices and amounts to 64.3% below the perovskite band gap. Finally, we demonstrate a four-terminal tandem device combining a high band gap graphene-contacted perovskite top solar cell (E-g = 1.6 eV) with an amorphous/crystalline silicon bottom solar cell (E-g = 1.12 eV).