Elucidating Mechanisms behind Ambient Storage-Induced Efficiency Improvements in Perovskite Solar Cells
Elucidating Mechanisms behind Ambient Storage-Induced Efficiency Improvements in Perovskite Solar Cells
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DOI：
10.1021/acsenergylett.0c02406
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发表时间：
2021-02-15
影响因子：
22
通讯作者：
Ho-Baillie, Anita W. Y.
中科院分区：
文献类型：
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作者：
Cho, Yongyoon;Kim, Hyung Do;Ho-Baillie, Anita W. Y.
在钙钛矿太阳能电池（PSC）中，通常可以看到环境储存期间功率转换效率（PCE）的初步改善。在这项工作中，我们研究了典型 n-i-p PSC 上环境存储增强 PCE 的起源。我们发现在存储的前 2 天期间，填充因子和开路电压都有所改善。通过分析温度和光强度相关的 V-OC，我们发现由于存储时钙钛矿表面的缺陷钝化，电荷复合机制从表面主导变为体主导。此外，我们发现存储提高了spiro-OMeTAD的电导率并降低了最高占据分子轨道能级，从而改善了电荷提取。这些结果表明，导致钙钛矿太阳能电池存储诱导改进的因素不止一个。
Initial improvement in power conversion efficiency (PCE) during ambient storage is often seen in perovskite solar cells (PSCs). In this work, we studied the origin of PCE enhancement by ambient storage on typical n-i-p PSCs. We found improvements in both fill factor and open-circuit voltage during the first 2 days of storage. By analyzing temperature and light intensity-dependent V-OC, we found that the charge recombination mechanism changed from surface- to bulk-dominated because of defect passivation at the perovskite surface upon storage. In addition, we found that storage improves the conductivity and lowers the highest occupied molecular orbital level of the spiro-OMeTAD, improving charge extraction. These results show that there is more than one factor causing the storage-induced improvements in perovskite solar cells.