Du Yachao, Tian Qingwen, Chang Xiaoming, Fang Junjie, Gu Xiaojing, He Xilai, Ren Xiaodong, Zhao Kui, Liu Shengzhong Frank
Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, No. 620, West Chang'an Avenue, Xi'an, 710119, P. R. China.
Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, No. 457, Zhongshan Road, Dalian, Liaoning, 116023, P. R. China.
Adv Mater. 2022 Mar;34(10):e2106750. doi: 10.1002/adma.202106750. Epub 2022 Jan 30.
All-inorganic cesium lead triiodide (CsPbI ) perovskite is well known for its unparalleled stability at high temperatures up to 500 °C and under oxidative chemical stresses. However, upscaling solar cells via ambient printing suffers from imperfect crystal quality and defects caused by uncontrollable crystallization. Here, the incorporation of a low concentration of novel ionic liquid is reported as being promising for managing defects in CsPbI films, interfacial energy alignment, and device stability of solar cells fabricated via ambient blade-coating. Both theoretical simulations and experimental measurements reveal that the ionic liquid successfully regulates the perovskite thin-film growth to decrease perovskite grain boundaries, strongly coordinates with the undercoordinated Pb to passivate iodide vacancy defects, aligns the interface to decrease the energy barrier at the electron-transporting layer, and relaxes the lattice strain to promote phase stability. Consequently, ambient printed CsPbI solar cells with power conversion efficiency as high as 20.01% under 1 sun illumination (100 mW cm ) and 37.24% under indoor light illumination (1000 lux, 365 µW cm ) are achieved; both are the highest for printed all-inorganic cells for corresponding applications. Furthermore, the bare cells show an impressive long-term ambient stability with only ≈5% PCE degradation after 1000 h aging under ambient conditions.
全无机铯铅三碘化物（CsPbI₃）钙钛矿因其在高达500°C的高温以及氧化化学应力下具有无与伦比的稳定性而闻名。然而，通过环境印刷扩大规模制造太阳能电池存在晶体质量不完善以及由不可控结晶导致的缺陷问题。在此，据报道掺入低浓度的新型离子液体有望解决通过环境刮刀涂布制备的CsPbI₃薄膜中的缺陷、界面能量对准以及太阳能电池的器件稳定性问题。理论模拟和实验测量均表明，该离子液体成功调节了钙钛矿薄膜的生长，减少了钙钛矿晶界，与配位不足的Pb强烈配位以钝化碘空位缺陷，使界面排列以降低电子传输层处的能垒，并缓解晶格应变以促进相稳定性。因此，实现了在1个太阳光照（100 mW/cm²）下功率转换效率高达20.01%以及在室内光照（1000勒克斯，365 μW/cm²）下高达37.24%的环境印刷CsPbI₃太阳能电池；这两者在相应应用的印刷全无机电池中均为最高效率。此外，裸电池在环境条件下老化1000小时后仅显示约5%的功率转换效率降解，展现出令人印象深刻的长期环境稳定性。
