锡
材料科学
同种类的
钙钛矿(结构)
八面体
单层
化学工程
纳米技术
结晶学
化学
冶金
晶体结构
热力学
工程类
物理
作者
Ziyong Kang,Kun Wang,Lu Zhang,Yang Yang,Jiandong Wu,Yu Tong,Yan Peng,Yali Chen,Heng Qi,Kun Sun,Peter Müller‐Buschbaum,Xuewen Zhang,Jingzhi Shang,Hongqiang Wang
出处
期刊:Small
[Wiley]
日期:2024-07-06
标识
DOI:10.1002/smll.202402028
摘要
Abstract 2D‐3D tin‐based perovskites are considered as promising candidates for achieving efficient lead‐free perovskite solar cells (PSCs). However, the existence of multiple low‐dimensional phases formed during the film preparation hinders the efficient transport of charge carriers. In addition, the non‐homogeneous distribution of low‐dimensional phases leads to lattice distortion and increases the defect density, which are undesirable for the stability of tin‐based PSCs. Here, mixed spacer cations [diethylamine (DEA + ) and phenethylamine (PEA + )] are introduced into tin perovskite films to modulate the distribution of the 2D phases. It is found that compared to the film with only PEA + , the combination of DEA + and PEA + favors the formation of homogeneous low‐dimensional perovskite phases with three octahedral monolayers ( n = 3), especially near the bottom interface between perovskite and hole transport layer. The homogenization of 2D phases help improve the film quality with reduced lattice distortion and released strain. With these merits, the tin PSC shows significantly improved stability with 94% of its initial efficiency retained after storing in a nitrogen atmosphere for over 4600 h, and over 80% efficiency maintained after continuous illumination for 400 h.
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