Eco-friendly small molecule with polyhydroxyl ketone as buried interface chelator for enhanced carrier dynamics toward high-performance perovskite solar cells  

以多羟基酮为界面螯合剂的生态友好型小分子对高性能钙钛矿太阳能电池载流子动力学的增强

作　　者：Rui Wu Bingxin Ding Shuping Xiao Wuchen Xiang Yiheng Gao Bobo Yuan Zhongli Qin Xiangbai Chen Pingli Qin 吴瑞;丁兵鑫;肖书萍;向伍晨;高屹恒;袁浡博;秦中立;陈相柏;秦平力

机构地区：[1]Hubei Key Laboratory of Optical Information and Pattern Recognition,Wuhan Institute of Technology,Wuhan 430205,China [2]School of Electronics and Information Engineering,Hubei University of Science and Technology,Xianning 437100,China [3]School of Optoelectronic Information and Energy Engineering,Wuhan Institute of Technology,Wuhan 430205,China

出　　处：《Science China Materials》2025年第4期1249-1258,共10页中国科学(材料科学)(英文版)

基　　金：supported by the Graduate Education Innovation Fund(CX2023277,CX2024082,CX2024086,CX2024097,CX2024098)of Wuhan Institute of Technology;the Natural Science Foundation of Hubei Province(2024AFB1029)。

摘　　要：Buried interface defects pose a significant challenge to achieving high efficiency and stability of n-i-p perovskite solar cells(PSCs).A multifunctional material is essential for passivating interface defects,suppressing non-radiative recombination,and facilitating rapid carrier transfer at these interfaces.Herein,a new multifunctional eco-friendly small molecule,D-fructose,was introduced into the interface as a modification layer,playing a significant role in passivating defects not only among SnO_(2) quantum dots(QDs),but also between perovskite and SnO_(2) QDs.The coordination bonds of the C=O group with Pb^(2+)and Sn^(4+)/Sn^(2+),along with the hydrogen bonds of the-OH group with I^(-)in perovskite,contribute to this passivation process.Meanwhile,this multifunctional collaboration at the buried interface not only triggers uniform heterogeneous nucleation across the perovskite precursor film,leading to high-quality perovskite,but also effectively eliminates residual PbI2 at grain boundaries to suppress perovskite degeneration.Achieving a more suitable energy level alignment between perovskite and SnO_(2) QDs can smooth the interface barrier,thereby facilitating the formation of an electron bridge for rapid electron extraction and transfer.Consequently,the D-fructose based PSC has achieved a champion efficiency of 24.91%with negligible J-V hysteresis,along with excellent stability.埋底界面缺陷对于n-i-p钙钛矿太阳能电池的高效率和优稳定性造成重要挑战.在这一界面处,多功能材料对于钝化界面缺陷、抑制非辐射复合和促进载流子快速转移至关重要.本文将一种新型多功能环保小分子D-果糖作为修饰层引入该界面,不仅在SnO_(2)量子点之间,而且在钙钛矿与SnO_(2)量子点之间的缺陷钝化中发挥了重要作用.C=O基团与钙钛矿界面侧Pb^(2+)、SnO_(2)量子点表面Sn^(4+)/Sn^(2+)配位成键,以及-OH基团与钙钛矿中I^(-)间形成氢键,都有助于这一界面钝化过程.同时,埋底界面处多功能协同不仅触发了钙钛矿前驱体膜上一致性地非均相成核,获得高质量的钙钛矿,而且有效地解决了钙钛矿晶界处残留的PbI2,抑制了钙钛矿的退化.此外,钙钛矿与SnO_(2)量子点间适配的能级分布,平滑了界面势垒,促进了电子桥的形成,从而实现了电子的快速提取与转移.因此,基于D-果糖的钙钛矿太阳能电池冠军效率达到了24.91%,J-V回滞可以忽略不计,并表现出出色的稳定性.

关 键 词：D-FRUCTOSE defect passivation buried interface device stability perovskite solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动]