钙钛矿(结构)
三元运算
材料科学
金属
离子半径
离子键合
兴奋剂
化学工程
结晶学
冶金
离子
光电子学
化学
有机化学
计算机科学
工程类
程序设计语言
作者
Jiwen Huang,Yanjun Xing,Minghui Shang,Jiaxin Li,Tonghui Guo,Xuesong Lin,Jiaxing Xiong,Qiuxiang Wang,Like Huang,Xiaohui Liu,Ziyang Hu,Qidong Tai,Zhenhua Yu,Yuejin Zhu,Liyuan Han,Jing Zhang
出处
期刊:Small
[Wiley]
日期:2023-09-03
卷期号:20 (2)
被引量:2
标识
DOI:10.1002/smll.202305736
摘要
Abstract Though Sn‐Pb alloyed perovskite solar cells (PSCs) achieved great progress, there is a dilemma to further increase Sn for less‐Pb requirement. High Sn ratio (>70%) perovskite exhibits nonstoichiometric Sn:Pb:I at film surface to aggravate Sn 2+ oxidation and interface energy mismatch. Here, ternary metal alloyed (FASnI 3 ) 0.7 (MAPb 1− x Zn x I 3 ) 0.3 ( x = 0–3%) is constructed for Pb% < 30% perovskite. Zn with smaller ionic size and stronger ionic interaction than Sn/Pb assists forming high‐quality perovskite film with ZnI 6 4− enriched at surface to balance Sn:Pb:I ratio. Differing from uniform bulk doping, surface‐rich Zn with lower lying orbits pushes down the energy band of perovskite and adjusts the interface energy for efficient charge transfer. The alloyed PSC realizes efficiency of 19.4% at AM1.5 (one of the highest values reported for Pb% < 30% PSCs). Moreover, stronger bonding of Zn─I and Sn─I contributes to better durability of ternary perovskite than binary perovskite. This work highlights a novel alloy method for efficient and stable less‐Pb PSCs.
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