Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis.
Evidence for ion migration in hybrid perovskite solar cells with minimal hysteresis.
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DOI：
10.1038/ncomms13831
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发表时间：
2016-12-22
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
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离子迁移被认为是混合钙钛矿太阳能电池中光伏电流-电压滞后的可能原因。这一假设的一个主要反对意见是，可以通过改变界面接触材料来减少磁滞；然而，这不太可能显著影响钙钛矿相中可移动离子电荷的行为。在这里，我们表明，离子迁移的主要影响可以观察到，无论接触是否改变，以提供具有或不具有显著滞后的器件。暂态光电子测量结合器件模拟表明，电场屏蔽与离子迁移相一致，在高和低滞后CH3NH3PbI3电池中都是相似的。对光电压和光电流瞬变的模拟表明，电滞效应需要在钙钛矿-接触界面附近结合可移动离子电荷和复合。钝化接触复合会在正向偏压下产生更高的光生电荷浓度，从而屏蔽离子电荷，减少磁滞。钙钛矿太阳能电池中的离子迁移与滞后有关，但并不是所有的钙钛矿电池都表现出滞后。在这里，Calado等人。结果表明，离子迁移与迟滞无关，但光生载流子屏蔽了某些太阳能电池结构中离子电荷的影响。
Ion migration has been proposed as a possible cause of photovoltaic current–voltage hysteresis in hybrid perovskite solar cells. A major objection to this hypothesis is that hysteresis can be reduced by changing the interfacial contact materials; however, this is unlikely to significantly influence the behaviour of mobile ionic charge within the perovskite phase. Here, we show that the primary effects of ion migration can be observed regardless of whether the contacts were changed to give devices with or without significant hysteresis. Transient optoelectronic measurements combined with device simulations indicate that electric-field screening, consistent with ion migration, is similar in both high and low hysteresis CH3NH3PbI3 cells. Simulation of the photovoltage and photocurrent transients shows that hysteresis requires the combination of both mobile ionic charge and recombination near the perovskite-contact interfaces. Passivating contact recombination results in higher photogenerated charge concentrations at forward bias which screen the ionic charge, reducing hysteresis. Ion migration has been related to hysteresis in perovskite solar cells, but not all perovskite cells exhibit a hysteresis. Here, Calado et al. show that ion migration occurs regardless of hysteresis, but photogenerated carriers screen the effects of ionic charge for some solar cell architectures.
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影响因子：
35
作者：
Lin, Qianqian;Armin, Ardalan;Meredith, Paul
通讯作者：
Meredith, Paul
影响因子：
27.8
作者：
Deng, Yehao;Xiao, Zhengguo;Huang, Jinsong
通讯作者：
Huang, Jinsong
影响因子：
16.6
作者：
Eames, Christopher;Frost, Jarvist M.;Barnes, Piers R. F.;O'Regan, Brian C.;Walsh, Aron;Islam, M. Saiful
通讯作者：
Islam, M. Saiful
影响因子：
17.1
作者：
Dualeh, Amalie;Moehl, Thomas;Graetzel, Michael
通讯作者：
Graetzel, Michael
影响因子：
8.6
作者：
Leguy, Aurelien M. A.;Hu, Yinghong;Barnes, Piers R. F.
通讯作者：
Barnes, Piers R. F.