Exploring multifunctional interfacial modifiers is an effective approach to addressing interface issues in perovskite solar cells(PSCs)and improving device performance and stability.While most interfacial modifiers fo...Exploring multifunctional interfacial modifiers is an effective approach to addressing interface issues in perovskite solar cells(PSCs)and improving device performance and stability.While most interfacial modifiers focus on passivating defects at the interfaces,there has been limited investigation into the relationship between molecular design and interfacial charge dynamics.This work introduces resonance molecules with a push-pull effect for interfacial modification,allowing for synergistic regulation of passivation effects and charge dynamics.Specifically,FCz-PO,which includes an electron-withdrawing fluorine atom,exhibits superior passivation but poor molecular stacking and charge extraction.In contrast,MCz-PO,featuring an electron-donating methoxy group,provides effective passivation,wellordered molecular packing,and efficient charge extraction and transport.Consequently,PSCs using MCz-PO achieve high power conversion efficiency(PCE)of 24.74%and excellent operational stability.This study suggests that resonance structures can be an effective molecular design strategy for developing interfacial modifiers with both strong passivation capabilities and well-regulated charge dynamics.展开更多
基金the financial support from the Natural Science Foundation of Xiamen,China(3502Z202373075)the National Natural Science Foundation of China(Grant nos.22175180,52311530673,22103013)+1 种基金the Natural Science Foundation of Fujian Province(No.2023J01527,2021J01184,2024J01189)the Start-up funding from Fujian Normal University(Y0720312K13)。
文摘Exploring multifunctional interfacial modifiers is an effective approach to addressing interface issues in perovskite solar cells(PSCs)and improving device performance and stability.While most interfacial modifiers focus on passivating defects at the interfaces,there has been limited investigation into the relationship between molecular design and interfacial charge dynamics.This work introduces resonance molecules with a push-pull effect for interfacial modification,allowing for synergistic regulation of passivation effects and charge dynamics.Specifically,FCz-PO,which includes an electron-withdrawing fluorine atom,exhibits superior passivation but poor molecular stacking and charge extraction.In contrast,MCz-PO,featuring an electron-donating methoxy group,provides effective passivation,wellordered molecular packing,and efficient charge extraction and transport.Consequently,PSCs using MCz-PO achieve high power conversion efficiency(PCE)of 24.74%and excellent operational stability.This study suggests that resonance structures can be an effective molecular design strategy for developing interfacial modifiers with both strong passivation capabilities and well-regulated charge dynamics.
