材料科学
掺杂剂
异质结
钙钛矿(结构)
兴奋剂
能量转换效率
光电子学
磁滞
制作
钙钛矿太阳能电池
纳米技术
化学工程
凝聚态物理
病理
工程类
物理
医学
替代医学
作者
Hong Qiao,Shuang Yang,Yun Wang,Xiao Chen,Tian Wen,Li Tang,Qilin Cheng,Yu Hou,Huijun Zhao,Hua Yang
标识
DOI:10.1002/adma.201804217
摘要
Abstract A gradient heterosturcture is one of the basic methods to control the charge flow in perovskite solar cells (PSCs). However, a classical route for gradient heterosturctures is based on the diffusion technique, in which the guest ions gradually diffuse into the films from a concentrated source of dopants. The gradient heterosturcture is only accessible to the top side, and may be time consuming and costly. Here, the “intolerant” n‐type heteroatoms (Sb 3+ , In 3+ ) with mismatched cation sizes and charge states can spontaneously enrich two sides of perovskite thin films. The dopants at specific sides can be extracted by a typical hole‐transport layer. Theoretical calculations and experimental observations both indicate that the optimized charge management can be attributed to the tailored band structure and interfacial electronic hybridization, which promote charge separation and collection. The strategy enables the fabrication of PSCs with a spontaneous graded heterojunction showing high efficiency. A champion device based on Sb 3+ doped film shows a stabilized power‐conversion efficiency of 21.04% with a high fill factor of 0.84 and small hysteresis.
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