Hysteresis, Stability, and Ion Migration in Lead Halide Perovskite Photovoltaics.
Hysteresis, Stability, and Ion Migration in Lead Halide Perovskite Photovoltaics.
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DOI：
10.1021/acs.jpclett.6b00579
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
K. Miyano;M. Yanagida;Neeti Tripathi;Y. Shirai
中科院分区：
文献类型：
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作者：
K. Miyano;M. Yanagida;Neeti Tripathi;Y. Shirai
离子迁移一直被怀疑是卤化铅钙钛矿光伏（PV）电池的各种不可再现和不稳定性质的起源，最显著的是滞后，因为研究的早期阶段。虽然已经提出了许多证据的离子运动的数值和实验，一个连贯的和定量的图片，占观察到的不可复制的现象仍然缺乏。然而，与此同时，已经注意到，在某些类型的PV电池中，滞后不存在或至少在测量再现性内。我们以前已经表明，电子特性的无砷电池是很好地代表在传统的无机半导体。在-1V ~+1.5V的偏置场下，这些测量的重复性一般在几十分钟内得到证实。为了探讨离子运动对无汞电池的影响，我们延长了电子测量的时间尺度和偏置范围，由此得出以下结论：（1）从各种证据来看，离子迁移是不可避免的。然而，它不会对PV操作造成有害影响。(2)我们建议，基于定量表征，降解更可能是由于在载体选择性层和钙钛矿之间的界面处的化学变化，而不是碘化铅钙钛矿体的组成变化。总之，它们给碘化铅钙钛矿在实际应用中的使用带来了很大的希望。
Ion migration has been suspected as the origin of various irreproducible and unstable properties, most notably the hysteresis, of lead halide perovskite photovoltaic (PV) cells since the early stage of the research. Although many evidence of ionic movement have been presented both numerically and experimentally, a coherent and quantitative picture that accounts for the observed irreproducible phenomena is still lacking. At the same time, however, it has been noticed that in certain types of PV cells, the hysteresis is absent or at least within the measurement reproducibility. We have previously shown that the electronic properties of hysteresis-free cells are well represented in terms of the conventional inorganic semiconductors. The reproducibility of these measurements was confirmed typically within tens of minutes under the biasing field of -1 V to +1.5 V. In order to probe the effect of ionic motion in the hysteresis-free cells, we extended the time scale and the biasing rage in the electronic measurements, from which we conclude the following: (1) From various evidence, it appears that ion migration is inevitable. However, it does not cause detrimental effects to the PV operation. (2) We propose, based on the quantitative characterization, that the degradation is more likely due to the chemical change at the interfaces between the carrier selective layers and perovskite rather than the compositional change of the lead iodide perovskite bulk. Together, they give much hope in the use of the lead iodide perovskite in the use of actual application.