Versatile Hole Selective Molecules Containing a Series of Heteroatoms as Self‐Assembled Monolayers for Efficient p‐i‐n Perovskite and Organic Solar Cells

杂原子 材料科学 单层 钙钛矿(结构) 能量转换效率 串联 自组装单层膜 密度泛函理论 有机太阳能电池 化学物理 纳米技术 光电子学 有机化学 结晶学 计算化学 聚合物 复合材料 化学 戒指(化学)
作者
Asmat Ullah,Keun Hyeong Park,YoungWan Lee,Sujung Park,Abdullah Bin Faheem,Hieu Dinh Nguyen,Yasir Siddique,Kyung‐Koo Lee,Yimhyun Jo,Chi‐Hwan Han,SeJin Ahn,Inyoung Jeong,Shinuk Cho,BongSoo Kim,Young S. Park,Sungjun Hong
出处
期刊:Advanced Functional Materials [Wiley]
卷期号:32 (49) 被引量:80
标识
DOI:10.1002/adfm.202208793
摘要

Abstract Inverted type perovskite solar cells (PSCs) have recently emerged as a major focus in academic and industrial photovoltaic research. Their multiple advantages over conventional PSCs include easy processing, hysteresis‐free behavior, high stability, and compatibility for tandem applications. However, the maximum power conversion efficiency (PCE) of inverted PSCs still lags behind those of conventional PSCs because suitable charge‐selective materials for inverted PSCs are limited. In this study, excellent hole‐selective materials for inverted PSCs are introduced. A series of tricyclic aromatic rings containing O, S, or Se, respectively, as a core heteroatom, along with a phosphonic acid anchor, form a self‐assembled monolayer (SAM) that directly contacts the perovskite absorber. The influence of heteroatoms in the aromatic structure on the molecular energetics and operating characteristics of the corresponding inverted PSCs is investigated using complementary experimental techniques as well as density functional theory (DFT) calculations. It is found that all of the SAMs formed an energetically well‐aligned interface with the perovskite absorber. The interaction energy between the Se‐containing SAM and perovskite absorber is the strongest among the series and it reduces the interfacial defect density, in turn leading to an extended charge carrier lifetime. As a result, PSCs incorporating the Se‐containing SAM achieves a PCE of 22.73% and retains ≈96% of their initial efficiency after a maximum power point tracking test of 500 h without encapsulation under ambient conditions. All of the SAMs are then employed in organic solar cells (OSCs). Again, the Se‐containing SAM‐based OSCs demonstrates the highest PCE of 17.9% among the three molecular SAM‐based OSCs. This study demonstrates the great potential for precisely engineered SAMs for use in high‐performance solar cells.
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