Multi-step slow annealing perovskite films for high performance planar perovskite solar cells
Multi-step slow annealing perovskite films for high performance planar perovskite solar cells
复制标题
用于高性能平面钙钛矿太阳能电池的多步缓慢退火钙钛矿薄膜
DOI：
10.1016/j.solmat.2015.06.018
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发表时间：
2015-10-01
影响因子：
6.9
通讯作者：
Zhu, Yuejin
中科院分区：
文献类型：
--
作者：
Huang, Like;Hu, Ziyang;Zhu, Yuejin
研究并比较了两种不同退火方法和不同退火温度梯度处理的钙钛矿薄膜的形貌、结构、光学和电学性能及其相应的器件性能。退火温度梯度显着影响钙钛矿薄膜的表面形貌和光学性质，这决定了太阳能电池的性能，从而决定了太阳能电池的性能。采用一步直接退火法处理的钙钛矿薄膜往往表现出不规则且较弱的紫外-可见吸收光谱，这很容易导致太阳能电池的最终性能发生较大变化。而多步缓慢退火有利于制备高度均匀且结晶良好的钙钛矿薄膜，因此这些器件呈现出紧密分布的性能参数。采用多步缓慢退火方法处理的最佳器件显示出短路电流密度为21.49 mA/cm(2)，开路电压为0.988 V，填充因子为64.86%，功率转换效率(PCE)为13.58%，相对于一步退火方法处理的器件的8.65%，整体PCE提高了57%。这些发现表明，优化的缓慢升温对于制备高效且可重复性良好的钙钛矿太阳能电池是必要的。 (C) 2015 Elsevier B.V. 保留所有权利。
The morphology, structure, optical and electrical properties of perovskite films treated by two different annealing methods with different annealing temperature ramp and their corresponding device performance have been studied and compared. Annealing temperature ramp significantly influences the surface morphology and optical properties of perovskite films which determines the performance of solar cells which determines the performance of solar cells. The perovskite films treated by one-step direct annealing method tend to exhibit irregular and weak ultraviolet-visible absorption spectrum, which can easily result in great variation in the final performance of solar cells. While multi-step slow annealing is beneficial for preparing highly uniform and well-crystallized perovskite films, and thus these devices present tightly-distributed performance parameters. The best device treated by multi-step slow annealing method showed a short circuit current density of 21.49 mA/cm(2), an open circuit voltage of 0.988 V, a fill factor of 64.86%, and a power conversion efficiency (PCE) of 13.58%, which is a 57% enhancement of the overall PCE relative to 8.65% of the device treated by one-step annealing method. These findings suggest that optimized slow temperature ramp is necessary to prepare high-efficient and well-reproducible perovskite solar cells. (C) 2015 Elsevier B.V. All rights reserved.