Mitigation of vacancy with ammonium salt-trapped ZIF-8 capsules for stable perovskite solar cells through simultaneous compensation and loss inhibition.
Mitigation of vacancy with ammonium salt-trapped ZIF-8 capsules for stable perovskite solar cells through simultaneous compensation and loss inhibition.
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通过同时补偿和损耗抑制，用铵盐捕获的 ZIF-8 胶囊减少空位，用于稳定的钙钛矿太阳能电池
DOI：
10.1039/d1na00173f
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发表时间：
2021-06-15
影响因子：
4.7
通讯作者：
中科院分区：
文献类型：
--
作者：
由于钙钛矿型薄膜在合成或使用过程中离子容易流失，空位普遍存在，加速了钙钛矿型材料的降解，严重影响了钙钛矿型太阳能电池的稳定性。因此，为了在弥补空位的同时减少氨阳离子的损失，提出了一种通过引入由沸石咪唑骨架-8(ZIF-8)包封剂和碘化铵盐组成的多功能胶囊作为钙钛矿和空穴传输层之间的中间层的缓释策略。在胶囊夹层中，不仅ZIF-8孔隙中的碘化铵盐会释放到钙钛矿层，弥补空位，而且ZIF-8还可以防止钙钛矿中的有机成分蒸发，并将钙钛矿与水分隔离。结果，由于引入的胶囊成功地钝化了缺陷，降低了陷阱密度，提高了器件效率，并增强了PSCS的稳定性。ZIF-8@FAI具有最高的效率19.13%，在150h的最大功率下，PCE稳定在初始效率的93%以上，这为基于多孔材料大家族的PSCs的效率和稳定性提供了一种新的策略。
Due to the easy loss of ions during synthesis or usage, vacancies in perovskite film are ubiquitous, accelerating the degradation of perovskite materials and seriously hampering the stability of perovskite solar cells (PSCs). Herein, to simultaneously compensate for vacancies and reduce ammonium cation loss, a sustained release strategy was proposed by introducing multi-functional capsules consisting of zeolitic imidazolate framework-8 (ZIF-8) encapsulation agent and ammonium iodide salts as interlayer between the perovskite and hole transport layer. In the capsule interlayer, not only are ammonium iodide salts in ZIF-8 pores released to the perovskite layer, compensating for the vacancies, but the ZIF-8 also prevents the organic component of perovskite from evaporating and isolates the perovskite from moisture. As a consequence, decreased trap density, improved device efficiency, and enhanced stability of PSCs are obtained owing to the successful passivation of defects by the introduced capsules. ZIF-8@FAI shows the highest efficiency of 19.13% and a stabilized PCE over 93% of the initial efficiency at maximum power point for 150 h. This work provides a new strategy to improve efficiency and stability of PSCs based on the large family of porous materials.
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