首页|Synergistic defect passivation and strain compensation toward efficient and stable perovskite solar cells

Synergistic defect passivation and strain compensation toward efficient and stable perovskite solar cells

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Rational interface engineering is essential for minimizing interfacial nonradiative recombination losses and enhancing device performance.Herein,we report the use of bidentate diphenoxybenzene(DPOB)isomers as surface modifiers for perovskite films.The DPOB molecules,which contain two oxygen(O)atoms,chemically bond with undercoordinated Pb2+on the surface of perovskite films,resulting in com-pression of the perovskite lattice.This chemical interaction,along with physical regulations,leads to the formation of high-quality perovskite films with compressive strain and fewer defects.This compressive strain-induced band bending promotes hole extraction and transport,while inhibiting charge recombina-tion at the interfaces.Furthermore,the addition of DPOB will reduce the zero-dimensional(0D)Cs4PbBr6 phase and produce the two-dimensional(2D)CsPb2Br5 phase,which is also conducive to the improve-ment of device performance.Ultimately,the resulting perovskite films,which are strain-released and defect-passivated,exhibit exceptional device efficiency,reaching 10.87％for carbon-based CsPbBr3 device,14.86％for carbon-based CsPbI2Br device,22.02％for FA0.97Cs0.03Pbl3 device,respectively.Moreover,the unencapsulated CsPbBr3 PSC exhibits excellent stability under persistent exposure to humidity(80％)and heat(80 ℃)for over 50 days.

Perovskite solar cellsNonradiative recombinationChemical interactionDefect passivationStrain engineering

Liqiang Bian、Zhe Xin、Yuanyuan Zhao、Lei Gao、Zhi Dou、Linde Li、Qiyao Guo、Jialong Duan、Jie Dou、Yingli Wang、Xinyu Zhang、Chi Jiang、Liqing Sun、Qiang Zhang、Qunwei Tang

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College of Energy Storage Technology,Shandong University of Science and Technology,Qingdao 266590,Shandong,China

College of Mechanical and Electronic Engineering Shandong University of Science and Technology,Qingdao 266590,Shandong China

Ural Institution,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan,China

Institute of Carbon Neutrality,College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China

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2024

10.1016/j.jechem.2024.06.031

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.98(11)