材料科学
钙钛矿(结构)
能量转换效率
掺杂剂
成核
带隙
化学工程
结晶
晶界
光电子学
兴奋剂
复合材料
微观结构
热力学
物理
工程类
作者
Hua Zhong,Xudong Liu,Mingxuan Liu,Song Yin,Zhongzhong Jia,Guangsheng Fu,Shaopeng Yang,Weiguang Kong
出处
期刊:Nano Energy
[Elsevier]
日期:2022-11-01
卷期号:105: 108014-108014
标识
DOI:10.1016/j.nanoen.2022.108014
摘要
Excess PbI 2 can improve the efficiency of perovskite solar cells (PSCs). However, it usually leads to poor cell stability due to the chemically active nature of PbI 2 . Improving the stability of PbI 2 -rich perovskite solar cells without scarifying the efficiency remains challenging. In this work, it is found that the non-uniform and multiple nucleation of perovskite induces crystallographic disorders at grain boundaries (GBs) of PbI 2 -rich perovskite. These disorders working as the n-type shallow dopant reduces the energy barrier for photogenerated electrons to reach GBs, triggering the decomposition of excess PbI 2 there. Therefore, the instability of PbI 2 -rich PSCs is related with the remote coupling of excess PbI 2 with the disorders at GBs. In light of this finding, we introduced a small amount (0.5 mol%) of CdI 2 into precursor solution to optimize the crystallization of PbI 2 -rich perovskite, and finally achieved a trade-off between efficiency and stability in PbI 2 -rich PSCs. The optimized PSCs with 10 mol% excess PbI 2 (PC-Device) achieved a champion efficiency of 24.26% at the bandgap 1.55 eV with robust stability. PC-Devices maintain more than 90% of the initial efficiency after being stressed under UV light in ambient with a relative humidity of 50% for 500 hours, and 70% under heat at 85˚C for 400 hours, both of which are far superior to the pristine PbI 2 -rich solar cells. • The instability of PbI 2 -rich PSCs is related to the disorders at GBs of perovskite. • A small amount of CdI 2 is introduced to restrain the disorders at GBs of perovskite with excess PbI 2 . • The stability of PbI 2 -rich PSCs is promoted greatly with the assist of CdI 2 . • High efficiency (24.26%) and V oc (1.18 V) are achieved for FAMA mixed PSCs.
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