Enhancing stability and efficiency of perovskite solar cells with crosslinkable silane-functionalized and doped fullerene.
Enhancing stability and efficiency of perovskite solar cells with crosslinkable silane-functionalized and doped fullerene.
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DOI：
10.1038/ncomms12806
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发表时间：
2016-10-05
影响因子：
16.6
通讯作者：
Huang J
中科院分区：
文献类型：
--
作者：
Bai Y;Dong Q;Shao Y;Deng Y;Wang Q;Shen L;Wang D;Wei W;Huang J
混合钙钛矿材料由于水和水分而引起的不稳定性是在所展示的高效钙钛矿太阳能电池的任何实际应用之前要解决的一个主要挑战。在这里，我们报告了一个简单的策略，可以同时提高p-i-n平面异质结结构钙钛矿器件的稳定性和效率。具有疏水官能团的交联硅烷分子键合到富勒烯上，使富勒烯层具有高度防水性。碘化甲基铵通过阴离子诱导的电子转移引入富勒烯层进行n掺杂，导致电导率急剧增加超过100倍。通过可交联的硅烷官能化和掺杂的富勒烯电子传输层，钙钛矿器件提供了19.5%的效率和80.6%的高填充因子。交联的硅烷改性的富勒烯层还通过在周围环境中暴露30天后保持其原始效率的近90%来增强非密封的钙钛矿装置的水和湿气稳定性。 永磁太阳能电池达到高效率，但其稳定性仍然是一个挑战。在这里，Bai等人用疏水和可交联分子功能化富勒烯基传输层，以制备在环境条件下一个月内达到19%效率和10%降解的器件。
The instability of hybrid perovskite materials due to water and moisture arises as one major challenge to be addressed before any practical application of the demonstrated high efficiency perovskite solar cells. Here we report a facile strategy that can simultaneously enhance the stability and efficiency of p–i–n planar heterojunction-structure perovskite devices. Crosslinkable silane molecules with hydrophobic functional groups are bonded onto fullerene to make the fullerene layer highly water-resistant. Methylammonium iodide is introduced in the fullerene layer for n-doping via anion-induced electron transfer, resulting in dramatically increased conductivity over 100-fold. With crosslinkable silane-functionalized and doped fullerene electron transport layer, the perovskite devices deliver an efficiency of 19.5% with a high fill factor of 80.6%. A crosslinked silane-modified fullerene layer also enhances the water and moisture stability of the non-sealed perovskite devices by retaining nearly 90% of their original efficiencies after 30 days' exposure in an ambient environment. Perovskite solar cells reach high efficiencies but their stability remains a challenge. Here, Bai et al. functionalize the fullerene-based transport layer with hydrophobic and crosslinkable molecules to prepare devices reaching 19% efficiency and degrading by 10% over a month in ambient conditions.
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