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Anion effect on properties of Zn-doped CH3NH3PbI3 based perovskite solar cells
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2021-09-23 , DOI: 10.1016/j.solmat.2021.111400
Chuanming Tian , Xuefei Han , Yu Zhao , Zhijian Sun , Chengyi Hou , Hongzhi Wang , Jiabin Qi , Yaogang Li , Wei Jia , Qinghong Zhang

High-quality perovskite films are crucial for developing efficient planar perovskite solar cells (PSCs). As-prepared perovskite films have low crystallinity and high level of trap densities, resulting in the deterioration of PSCs performances. Herein, a facile approach is adopted to fabricate high-quality CH3NH3PbI3 films by incorporating different types of zinc salt, including zinc iodide (ZnI2), zinc chloride (ZnCl2), and zinc acetate (Zn(Ac)2). It is demonstrated that zinc ions (Zn2+) substitute a part of the lead ion (Pb2+) sites, enlarging the grain size, and suppressing the formation of metallic lead. Moreover, the acetate anion bearing the carbonyl species (Cdouble bondO) effectively passivates the under-coordinated Pb2+ defects and further reduces the defect densities at both the grain boundaries and interfaces. As a result, the planar PSCs with the Zn(Ac)2 additive yield a champion power conversion efficiency (PCE) of 19.32%, which is 15% higher than that of the control device. Simultaneously, the outperforming device delivers remarkable stability, retaining 87% of its original efficiency after aging for 500 h under ambient conditions.



中文翻译:

阴离子对Zn掺杂CH3NH3PbI3基钙钛矿太阳能电池性能的影响

高质量的钙钛矿薄膜对于开发高效的平面钙钛矿太阳能电池 (PSC) 至关重要。所制备的钙钛矿薄膜具有低结晶度和高陷阱密度,导致 PSC 性能下降。在本文中,一个浅显的方法被采用以制造高品质的CH 3层NH 3碘化铅3层通过结合不同类型的锌盐,包括碘化锌(ZnI膜2),氯化锌(的ZnCl 2)和醋酸锌(锌(AC)2)。结果表明,锌离子(Zn 2+)取代了一部分铅离子(Pb 2+) 位点,增大晶粒尺寸,并抑制金属铅的形成。此外,带有羰基物质 ( 双键CO)的乙酸根阴离子有效地钝化了配位不足的 Pb 2+缺陷,并进一步降低了晶界和界面处的缺陷密度。结果,具有 Zn(Ac) 2添加剂的平面 PSC产生了 19.32% 的功率转换效率 (PCE),比控制装置的功率转换效率 (PCE) 高 15%。同时,性能出众的设备提供了卓越的稳定性,在环境条件下老化 500 小时后仍保持其原始效率的 87%。

更新日期:2021-09-23
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