2022 Small Structures:稳定性提升!探讨末端基团对于低维钙钛矿之影响

SS-X 太阳光模拟器使效率突破成为可能!

  Small Structures (IF 11.459) 于2022年1月刊登普度大学Letian Dou等人的研究成果。金属卤化物钙钛矿拥有出色的特性可应用在太阳能电池、探测器等领域。近期钙钛矿太阳能电池 (perovskite solar cell, PSC) 的效率已超过25%,然而在制造过程中,钙钛矿层的表面和晶界处会形成许多晶体缺陷,影响了PSC的稳定性。为解决此问题,有一种方法是开发低维钙钛矿 (2D、1D和0D)。相较3D钙钛矿,低维钙钛矿表现出更高的稳定性和更多的结构和组成多功能性。若将有机分子内嵌入二维层状杂化钙钛矿,更能进一步调整二维钙钛矿的电子和光学性质。然而,目前共轭有机结构单元与金属卤化物无机结构单元之间的相互作用尚未得到充分研究。

  为研究不同锚定基团对晶体结构、相形成和器件性能的影响,于此篇研究中,研究团队设计并合成一系列具有FA (formamidinium)、Im (imidazolium) 和BIm (benzimidazolium) 端基的官能化联噻吩有机配体,能大幅影响低维钙钛矿的晶体结构。而后合成一系列基于Pb和Sn的OSiP (organic semiconductor-incorporated perovskite),即一种混成结构,在无机八面体框架之间插入了功能性有机阳离子。具有Imand BIm端基的配体能够成功形成一维或二维钙钛矿,而具有FA端基的配体会引起钙钛矿八面体的畸变并形成”阶梯状”结构。

synthetic routes of ligands low-dimensional perovskite

配體2TFAI、2TImI和2TBImI的合成路線。

  研究团队使用光焱科技的太阳光模拟器与其他仪器进行量测。结果发现,配体的末端基团对配体与八面体钙钛矿的相互作用有显著影响,进而影响晶体结构的形成。只有使用Im和BIm末端基团的配体钝化的3D钙钛矿太阳能电池表现出功率转换效率的提高以及滞后的降低。此研究显示,新型锚定基团在确定OSiP的晶体结构和特性方面发挥着关键作用。进一步研究这些具有不同末端基团的共轭配体其电子和光学性质,可挖掘更多潜在的应用。

Enlitech’s solar simulator and other instruments were used in this study to assist in the measurement. It was found that the terminal groups of the ligands have significant effect on the interactions between ligands and octahedrain perovskites, which in turn affect the formation of the crystal structures. Only the 3Dperovskite solar cells passivated by the ligands with Im and BIm terminal groups exhibit improved power conversion efficiencies and reduced hysteresis. This study shows that novel anchoring groups play a key role in determining the crystal structures and properties of OSiPs. The electronic and optical properties of these conjugated ligands with different end groups can be further studied to explore more potential applications.
Enlitech’s solar simulator and other instruments were used in this study to assist in the measurement. It was found that the terminal groups of the ligands have significant effect on the interactions between ligands and octahedrain perovskites, which in turn affect the formation of the crystal structures. Only the 3Dperovskite solar cells passivated by the ligands with Im and BIm terminal groups exhibit improved power conversion efficiencies and reduced hysteresis. This study shows that novel anchoring groups play a key role in determining the crystal structures and properties of OSiPs. The electronic and optical properties of these conjugated ligands with different end groups can be further studied to explore more potential applications.

A)在空穴传输层和钙钛矿层之间插入配体层的钙钛矿太阳能电池结构方案。 B)具有不同钝化层的器件的J-V曲线以及与没有钝化层的对照器件的比较。 C)在反向扫描和正向扫描中,控制装置和用2TBImI钝化的装置的Champion J-V曲线。D)控制器件和用2TBImI钝化的器件的 EQE 光谱和积分的光电流密度,集成在AM1.5太阳光谱上。

本文关键词:低维钙钛矿、low-dimensional perovskite、有机配体、organic ligand、太阳能电池、perovskite solar cell、太阳光模拟器、Solar Simulator

原文: https://doi.org/10.1002/sstr.202100173

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