Local nearly non-strained perovskite lattice approaching a broad environmental stability window of efficient solar cells
Local nearly non-strained perovskite lattice approaching a broad environmental stability window of efficient solar cells
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DOI：
10.1016/j.nanoen.2020.104940
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发表时间：
2020-09
期刊：
影响因子：
17.6
通讯作者：
Jie Xu;Hua Dong;Jun Xi;Yingguo Yang;Yue Yu;Lin Ma;Jinbo Chen;B. Jiao;X. Hou;Jingrui Li-Jingru
中科院分区：
文献类型：
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作者：
Jie Xu;Hua Dong;Jun Xi;Yingguo Yang;Yue Yu;Lin Ma;Jinbo Chen;B. Jiao;X. Hou;Jingrui Li-Jingru
由于钙钛矿杂化材料的软晶格性质，在恶劣的环境条件下容易发生表面晶格的扭曲和断裂。因此，产生表面缺陷和晶格畸变，这使得钙钛矿太阳能电池（PSC）的性能损失和臭名昭著的退化。在我们的工作中，明智地选择共轭配体作为膜中间体，其中刚性和离域4-苯基吡啶（4-pPy）表现出最显着的改善的光电性能和稳定性的PSC。通过调节薄膜晶化动力学，可以获得具有较好晶向的高质量钙钛矿薄膜。此外，由于缺陷钝化和单向成键效应，在晶格表面配位的4-pPy“支架”可以在苛刻条件下减轻空位形成和晶格扭曲/断裂。所得到的p-i-n平面器件显示出21.12%的相当大的PCE（经认证为20.2%），具有可忽略的滞后，以及优异的存储（在60%RH下1000小时后为原始PCE的90%）、操作（在最大功率点下600小时后为原始PCE的90%）和热应力（在85 °C下500小时后为原始PCE的89%）稳定性。希望我们的研究结果可以开辟一条新的途径，以加速PSC制度的持续进展，以实现效率最大化和稳定性延长。
Twist and fracture of surface lattice tend to occur under harsh condition due to the soft lattice natures of hybrid perovskite materials. Accordingly, surface defects and lattice distortion are produced, which allow the performance loss and notorious degradation in perovskite solar cells (PSCs). In our work, judiciously selected conjugated ligand was employed as the film intermediary, from which rigid and delocalization 4-phenylpyridine (4-pPy) exhibited the most significant improvement on both optoelectrical performance and stability of PSCs. By regulating the film crystallization kinetics, high-quality perovskite films can be obtained with preferable crystal orientation. Moreover, benefiting from the defects passivation and unidirectional bonding effect, coordinated 4-pPy “scaffold” on the lattice surface could mitigate vacancy formation and lattice twist/fracture under severe conditions. The resulted p-i-n planar device shows a considerable PCE of 21.12% (certified 20.2%) with negligible hysteresis, as well as an excellent storage (90% of original PCE after 1000 h at 60% RH), operating (90% of original PCE after 600 h at maximum power point) and thermal stress (89% of original PCE after 500 h at 85 °C) stability. It is hoped that our findings could open a new way to accelerate continued progress on PSCs regimes for efficieny maximization and stability prolongation.