首页|Controllable Exciton Diffusion Length and Ultrafast Charge Generation in Ternary Organic Solar Cells

Controllable Exciton Diffusion Length and Ultrafast Charge Generation in Ternary Organic Solar Cells

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Charge generation,a critical process in the operation of organic solar cell(OSC),requires thorough investigation in an ultrafast per-spective.This work demonstrates that the utilization of alloy model for the non-fullerene acceptor(NFA)component can regulate the crystallization properties of active layer films,which in turn affects exciton diffusion and hole transfer(HT),ultimately influencing the charge generation process.By incorporating BTP-eC7 as a third component,without expanding absorption range or changing molecular energy levels but regulating the ultrafast exciton diffusion and HT processes,the power conversion efficiency(PCE)of the optimized PM6:BTP-eC9:BTP-eC7 based ternary OSC is improved from 17.30％to 17.83％,primarily due to the enhancement of short-circuit current density(Jsc).Additionally,the introduction of BTP-eC7 also reduces the trap state density in the photoactive layer which helps to reduce the loss of Jsc.This study introduces a novel approach for employing ternary alloy models by incorporat-ing dual acceptors with similar structures,and elucidates the underlying mechanism of charge generation and Jsc in ternary OSCs.

Organic photovoltaicsTernary strategyExciton diffusionHole transferTrap stateKineticsAlloysPhotophysics

Sixuan Cheng、Jiawei Qiao、Peng Lu、Wei Qin、Xiaotao Hao

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School of Physics,State Key Laboratory of Crystal Materials,Shandong University,Jinan,Shandong 250100,China

School of Physics,National Demonstration Center for Experimental Physics Education,Shandong University,Jinan,Shandong 250100,China

ARC Centre of Excellence in Exciton Science,School of Chemistry,The University of Melbourne,Parkville,Victoria 3010,Australia

National Natural Science Foundation of ChinaMajor Program of Natural Science Foundation of Shandong ProvinceTaishan Scholars ProgramARC Centre of Excellence in Exciton Science

52073162ZR2019ZD43tstp20230610CE170100026

2024

10.1002/cjoc.202300741

中国化学(英文版)
中国化学会 上海有机化学研究所

中国化学(英文版)

CSTPCD
影响因子：0.848
ISSN：1001-604X
年,卷(期)：2024.42(11)