首页|Over 18.2％efficiency of layer-by-layer all-polymer solar cells enabled by homoleptic iridium(Ⅲ)carbene complex as solid additive

Over 18.2％efficiency of layer-by-layer all-polymer solar cells enabled by homoleptic iridium(Ⅲ)carbene complex as solid additive

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The vertical phase distribution of active layers plays a vital role in balancing exciton dissociation and charge transport for achieving efficient polymer solar cells(PSCs).The layer-by-layer(LbL)PSCs are com-monly prepared by using sequential spin-coating method from donor and acceptor solutions with dis-tinct solvents and solvent additives.The enhanced exciton dissociation is expected in the LbL PSCs with efficient charge transport in the relatively neat donor or acceptor layers.In this work,a series of LbL all-polymer solar cells(APSCs)were fabricated with PM6 as donor and PY-DT as acceptor,and triplet material m-Ir(CPmPB)3 is deliberately incorporated into PY-DT layer to prolong exciton lifetimes of active layers.The power conversion efficiency(PCE)of LbL APSCs is improved to 18.24％from 17.32％by incorporating 0.3 wt％m-Ir(CPmPB)3 in PY-DT layer,benefiting from the simultaneously enhanced short-circuit current density(Jsc)of 25.17 mA cm-2 and fill factor(FF)of 74.70％.The enhancement of PCE is attributed to the efficient energy transfer of m-Ir(CPmPB)3 to PM6 and PY-DT,resulting in the prolonged exciton lifetime in the active layer and the increased exciton diffusion distance.The efficient energy transfer from m-Ir(CPmPB)3 to PM6 and PY-DT layer can be confirmed by the increased photo-luminescence(PL)intensity and the prolonged PL lifetime of PM6 and PY-DT in PM6+m-Ir(CPmPB)3 and PY-DT+m-Ir(CPmPB)3 films.This study indicates that the triplet material as solid additive has great potential in fabricating efficient LbL APSCs by prolonging exciton lifetimes in active layers.

Layer-by-layerAll-polymer solar cellsAdditive strategyTriplet materialEnergy transfer

Hang Zhou、Yingjie Sun、Miao Zhang、Yuheng Ni、Fenghua Zhang、Sang Young Jeong、Tianhuan Huang、Xiong Li、Han Young Woo、Jian Zhang、Wai-Yeung Wong、Xiaoling Ma、Fujun Zhang

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Key Laboratory of Luminescence and Optical Information,Ministry of Education,Beijing Jiaotong University,Beijing 100044,China

Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy,The Hong Kong Polytechnic University,Hong Kong 999077,China

Department of Physics,Beijing Technology and Business University,Beijing,100048,China

Organic Optoelectronic Materials Laboratory,Department of Chemistry,College of Science,Korea University,Seoul 02841,Republic of Korea

School of Materials Science and Engineering,Engineering Research Center of Electronic Information Materials and Devices,Ministry of Education,Guangxi Key Laboratory of Information Materials,Guilin University of Electronic Technology,Guilin 541004,China

Key Laboratory of Luminescence and Optical Information(Ministry of Education),Beijing Jiaotong University,Beijing 100044,China

Tangshan Research Institute of Beijing Jiaotong University,Tangshan 063000,China

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Beijing Natural Science FoundationBeijing Natural Science FoundationNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Hebei ProvinceNational Research Foundation of KoreaHong Kong Research Grants CouncilRGC Senior Research Fellowship SchemeResearch Institute for Smart Energy(CDAQ)Ms.Clarea Au for the Endowed Professorship in Energy

423207312320296217501162105017622052765231101105F20231050022023K2A9A2A06059546PolyU 15307321SRFS2021-5S01847S

2024

10.1016/j.scib.2024.07.027

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(18)
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