Degradation Kinetics of Inverted Perovskite Solar Cells.
Degradation Kinetics of Inverted Perovskite Solar Cells.
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DOI：
10.1038/s41598-018-24436-6
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发表时间：
2018-04-13
影响因子：
4.6
通讯作者：
Friend RH
中科院分区：
文献类型：
--
作者：
Alsari M;Pearson AJ;Wang JT;Wang Z;Montisci A;Greenham NC;Snaith HJ;Lilliu S;Friend RH
研究了倒置未封装甲酰胺(FA)0.83Cs0.17Pb(I0.8Br0.2)3、CH3NH3PbI3和CH3NH3PbI3−xClx钙钛矿太阳电池在连续光照和直接氧气暴露下的退化行为。我们通过电流-电压扫描、瞬时光电流和瞬时光电压测量对器件进行了连续的原位和在位测试，发现CH3NH3PbI3−xClx太阳电池由于氧暴露而发生退化的时间比FA0.83Cs0.17Pb0.17Pb3(I0.8Br0.2)3混合阳离子器件发生的时间更短。我们将这些氧引起的功率转换效率的损失归因于钙钛矿光活性层中电子陷阱的形成。我们的结果强调，甲胺铯混合阳离子钙钛矿电池对氧诱导的降解比基于甲铵的钙钛矿电池更不敏感，进一步提高钙钛矿太阳能电池的稳定性应该集中在减少老化过程中陷阱的产生。
We explore the degradation behaviour under continuous illumination and direct oxygen exposure of inverted unencapsulated formamidinium(FA)0.83Cs0.17Pb(I0.8Br0.2)3, CH3NH3PbI3, and CH3NH3PbI3−xClx perovskite solar cells. We continuously test the devices in-situ and in-operando with current-voltage sweeps, transient photocurrent, and transient photovoltage measurements, and find that degradation in the CH3NH3PbI3−xClx solar cells due to oxygen exposure occurs over shorter timescales than FA0.83Cs0.17Pb(I0.8Br0.2)3 mixed-cation devices. We attribute these oxygen-induced losses in the power conversion efficiencies to the formation of electron traps within the perovskite photoactive layer. Our results highlight that the formamidinium-caesium mixed-cation perovskites are much less sensitive to oxygen-induced degradation than the methylammonium-based perovskite cells, and that further improvements in perovskite solar cell stability should focus on the mitigation of trap generation during ageing.
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