State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, School of Renewable Energy, North China Electric Power University, Beijing 102206, China.
Nanoscale. 2019 Jan 17;11(3):1228-1235. doi: 10.1039/c8nr07638c.
Instability of the perovskite materials, especially in high humidity, is one of the major limitations that hinders the development of perovskite devices. Herein, to eliminate the degradation of perovskite solar cells in humid air, a water-resistant perovskite absorption layer is proposed by introducing a macrocycle-type cyclodextrin material (β-CD) into the films. The β-CD was proved to be capable of facilitating the crystallization of grains and enhancing the stability of the perovskite by forming supramolecular interactions with organic cations through the hydrogen bonding in the perovskite films. Consequently, the average efficiency of the PSCs remarkably increased from 16.19% to 19.98%. The champion solar cell even delivered an efficiency of 20.09%. The PSCs with β-CD exhibited superior long-term stability in ambient air without encapsulation, which retained 90% of the initial efficiency after continuous AM 1.5 illumination in ambient air with 80% humidity for 300 h.
钙钛矿材料的不稳定性，特别是在高湿度环境下，是阻碍钙钛矿器件发展的主要限制因素之一。在此，为了消除钙钛矿太阳能电池在潮湿空气中的降解，通过在薄膜中引入大环型环糊精材料（β-CD），提出了一种耐水的钙钛矿吸收层。β-CD 被证明能够通过在钙钛矿薄膜中形成氢键来与有机阳离子形成超分子相互作用，从而促进晶粒的结晶和提高钙钛矿的稳定性。因此，PSC 的平均效率从 16.19%显著提高到 19.98%。具有 β-CD 的钙钛矿太阳能电池甚至实现了 20.09%的效率。具有 β-CD 的 PSCs 在没有封装的情况下表现出优异的长期稳定性，在湿度为 80%的环境空气中，在 AM 1.5 光照下连续 300 小时后，仍保留初始效率的 90%。
