Temperature‐ and Bias‐Dependent Degradation and Regeneration of Perovskite Solar Cells with Organic and Inorganic Hole Transport Layers
Temperature‐ and Bias‐Dependent Degradation and Regeneration of Perovskite Solar Cells with Organic and Inorganic Hole Transport Layers
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DOI：
10.1002/pssa.202000721
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
C. Swartz;N. Khakurel;S. Najar;M. I. Hossain;A. Zakhidov
中科院分区：
文献类型：
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作者：
C. Swartz;N. Khakurel;S. Najar;M. I. Hossain;A. Zakhidov
混合卤化物钙钛矿太阳能电池因其高功率转换效率而受到广泛关注。然而，稳定性差仍然是阻碍其商业化的最大障碍。性能的下降和恢复与环境和施加的偏压有复杂的关系，偏压会影响离子的迁移。本文比较了具有有机空穴传输层的太阳能电池和具有无机空穴传输层的太阳能电池。研究了有机传输层的一种降解，这种降解是通过应用正向偏置浸泡可逆的，并解释了离子迁移机制如何引起降解。实验电流电压和电容瞬态测量作为温度的函数进行。由此产生的S - kink和正电容衰减是根据空穴传输层离子密度变化的模型效应来解释的。加热到100°C以上时，发现不可逆的降解。相反，发现无机空穴传输层即使在高温下，只要避免空气暴露，也可以消除可观察到的离子迁移效应。
Hybrid halide perovskite solar cells have drawn widespread attention with the achievement of high power conversion efficiencies. However, poor stability remains the greatest barrier preventing their commercialization. Performance degradation and recovery have a complicated dependence on the environment and a dependence on the applied bias, which affects ion migration. Herein, solar cells with an organic hole transport layer and cells with an inorganic hole transport layer are compared. A type of degradation of the organic transport layer is examined, which is reversible by applying a forward bias soak, and how the degradation arises from ion migration mechanisms is explained. Experimental current–voltage and capacitance transient measurements are conducted as a function of temperature. The resulting S‐kink and positive capacitance decay are explained in terms of the modeled effects of a changing ion density at the hole transport layer. An irreversible degradation is found upon heating to more than 100 °C. On the contrary, the inorganic hole transport layer is found to eliminate the observable effects of ion migration, even at elevated temperatures, so long as air exposure is avoided.