Carbon Nanotube/Polymer Composites as a Highly Stable Hole Collection Layer in Perovskite Solar Cells
Carbon Nanotube/Polymer Composites as a Highly Stable Hole Collection Layer in Perovskite Solar Cells
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DOI：
10.1021/nl501982b
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发表时间：
2014-10-01
期刊：
影响因子：
10.8
通讯作者：
Snaith, Henry J.
中科院分区：
文献类型：
--
作者：
Habisreutinger, Severin N.;Leijtens, Tomas;Snaith, Henry J.
有机-无机钙钛矿太阳能电池最近出现在光化学研究的最前沿。功率转换效率在短短四年内经历了前所未有的增长，报告值超过19%。由于重点主要放在效率上，稳定性方面迄今尚未得到彻底解决。在本文中，我们将热稳定性确定为钙钛矿太阳能电池的一个基本弱点，并通过将有机空穴传输材料替换为嵌入绝缘聚合物基质中的聚合物官能化单壁碳纳米管（SWNTs）来证明一种优雅的方法来减轻热降解。通过这种复合结构，我们实现了高达15.3%的JV扫描功率转换效率，平均效率为10 +/-2%。此外，我们观察到强烈的延迟热降解相比，采用最先进的有机空穴传输材料的细胞。此外，抗水侵入性显著增强。这些是实现高效钙钛矿太阳能电池长期稳定性的关键发展。
Organic-inorganic perovskite solar cells have recently emerged at the forefront of photovoltaics research. Power conversion efficiencies have experienced an unprecedented increase to reported values exceeding 19% within just four years. With the focus mainly on efficiency, the aspect of stability has so far not been thoroughly addressed. In this paper, we identify thermal stability as a fundamental weak point of perovskite solar cells, and demonstrate an elegant approach to mitigating thermal degradation by replacing the organic hole transport material with polymer-functionalized single-walled carbon nanotubes (SWNTs) embedded in an insulating polymer matrix. With this composite structure, we achieve JV scanned power-conversion efficiencies of up to 15.3% with an average efficiency of 10 +/- 2%. Moreover, we observe strong retardation in thermal degradation as compared to cells employing state-of-the-art organic hole-transporting materials. In addition, the resistance to water ingress is remarkably enhanced. These are critical developments for achieving long-term stability of high-efficiency perovskite solar cells.